1997 |
Mylonas, C C; III, Woods L C; Zohar, Y Cyto-histological examination of post-vitellogenesis and final oocyte maturation in captive-reared striped bass Journal Article Journal of Fish Biology, 50 (1), pp. 34–49, 1997, ISSN: 00221112. @article{mylonas_cyto-histological_1997, title = {Cyto-histological examination of post-vitellogenesis and final oocyte maturation in captive-reared striped bass}, author = {C C Mylonas and L C Woods III and Y Zohar}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030910478&doi=10.1006%2fjfbi.1996.0275&partnerID=40&md5=abcc991c7bc67da2d0568b13c38816b3}, doi = {10.1006/jfbi.1996.0275}, issn = {00221112}, year = {1997}, date = {1997-01-01}, journal = {Journal of Fish Biology}, volume = {50}, number = {1}, pages = {34--49}, abstract = {The ovarian development of captive-reared, striped bass Morone saxatilis was examined during a 10-week period encompassing the spawning season. Vitellogenic oocytes in March had a mean diameter of 838 ± 18 μm and did not grow significantly therafter. Except from one non-hormone-treated fish, all females failed to undergo final oocyte maturation (FOM) and their ovaries became atretic with the onset of high spring temperatures. A clearing fixative was found useful in identifying early of atresia, evident by the absence of the germinal vesicle (GV). Final oocyte maturation of fish maturation of fish treated with gonadotropin-releasing hormone agonist (GnRhA) consisted of two phases. Early FOM lasted from 1 to 3 weeks, and was associated with lipid-droplet coalescence, and displacement of the GV and yolk globules to the peripheral cytoplasm. Late FOM lasted textless24 h, and consisted of yolk-globule coalescence and GV breakdown (GVBD). Ovulated eggs had completely coalesced lipid and yolk masses, with cortical alveoli lined against the cell wall. Both phases of FOM were associated with significant increases in oocyte diameter. Striped boss oocytes showed important morphological differences compared to oocytes of other members of the Moronidae family, in terms of percentage lipid content, chorion thickness and degree of hydration after ovulation.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The ovarian development of captive-reared, striped bass Morone saxatilis was examined during a 10-week period encompassing the spawning season. Vitellogenic oocytes in March had a mean diameter of 838 ± 18 μm and did not grow significantly therafter. Except from one non-hormone-treated fish, all females failed to undergo final oocyte maturation (FOM) and their ovaries became atretic with the onset of high spring temperatures. A clearing fixative was found useful in identifying early of atresia, evident by the absence of the germinal vesicle (GV). Final oocyte maturation of fish maturation of fish treated with gonadotropin-releasing hormone agonist (GnRhA) consisted of two phases. Early FOM lasted from 1 to 3 weeks, and was associated with lipid-droplet coalescence, and displacement of the GV and yolk globules to the peripheral cytoplasm. Late FOM lasted textless24 h, and consisted of yolk-globule coalescence and GV breakdown (GVBD). Ovulated eggs had completely coalesced lipid and yolk masses, with cortical alveoli lined against the cell wall. Both phases of FOM were associated with significant increases in oocyte diameter. Striped boss oocytes showed important morphological differences compared to oocytes of other members of the Moronidae family, in terms of percentage lipid content, chorion thickness and degree of hydration after ovulation. |
Pavlidis, M; Berry, M; Divanach, P; Kentouri, M Diel pattern of haematocrit, serum metabolites, osmotic pressure, electrolytes and thyroid hormones in sea bass and sea bream Journal Article Aquaculture International, 5 , pp. 237 – 247, 1997. @article{pavlidis_diel_1997, title = {Diel pattern of haematocrit, serum metabolites, osmotic pressure, electrolytes and thyroid hormones in sea bass and sea bream}, author = {M Pavlidis and M Berry and P Divanach and M Kentouri}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000527603&partnerID=40&md5=43ffd0cedb64e4f7359a2e7f9a22c7ef}, year = {1997}, date = {1997-01-01}, journal = {Aquaculture International}, volume = {5}, pages = {237 -- 247}, abstract = {The diel pattern of haematocrit, serum metabolites, electrolytes and thyroid hormones are described in sea bass, Dicentrarchus labrax, and sea bream, Sparus auratus, held under 12L:12D light cycle (0600-1800 h light). No diel rhythmicity in haematocrit, total proteins, potassium and chloride was observed. Maximum values of glucose, osmotic pressure and sodium were recorded at dusk (1800 h) in both species, irrespective of differences in the size of fish and feeding regime used. Maximum and minimum triiodothyronine values were found during the scotophase in bass and during the photophase in bream. Maximum thyroxine levels occurred at 1400 h (bass) and 1800 h (bream) and minimum during the scotophase, in both species. The light/dark alternation seems to be an important synchronizer of the observed diel changes. Results are discussed in relation to the timing of feeding and the general activity of the fish.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The diel pattern of haematocrit, serum metabolites, electrolytes and thyroid hormones are described in sea bass, Dicentrarchus labrax, and sea bream, Sparus auratus, held under 12L:12D light cycle (0600-1800 h light). No diel rhythmicity in haematocrit, total proteins, potassium and chloride was observed. Maximum values of glucose, osmotic pressure and sodium were recorded at dusk (1800 h) in both species, irrespective of differences in the size of fish and feeding regime used. Maximum and minimum triiodothyronine values were found during the scotophase in bass and during the photophase in bream. Maximum thyroxine levels occurred at 1400 h (bass) and 1800 h (bream) and minimum during the scotophase, in both species. The light/dark alternation seems to be an important synchronizer of the observed diel changes. Results are discussed in relation to the timing of feeding and the general activity of the fish. |
Tselepides, A; Polychronaki, T; Dafnomili, E; Plaiti, W; Zivanovic, S Distribution of nutrients, chloroplastic pigments, POC, PON and ATP in the Cretan Sea (NE Mediterranean): Seasonal and interannual variability Inproceedings pp. 189–193, 1997, (Publication Title: The 5th Pan-Hellenic Symposium of Oceanography and Fisheries). @inproceedings{tselepides_distribution_1997, title = {Distribution of nutrients, chloroplastic pigments, POC, PON and ATP in the Cretan Sea (NE Mediterranean): Seasonal and interannual variability}, author = {A Tselepides and T Polychronaki and E Dafnomili and W Plaiti and S Zivanovic}, year = {1997}, date = {1997-01-01}, volume = {I}, pages = {189--193}, note = {Publication Title: The 5th Pan-Hellenic Symposium of Oceanography and Fisheries}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Koutsoubas, D; Dounas, C; Petihakis, G; Arvanitidis, C; Triantafyllou, G; Dafnomili, E; Zivanovic, S Dynamics of the physicochemical parameters in water column and in the sediments of the Gialova lagoon (NW Peloponnese, Ionian Sea) Inproceedings pp. 351–353, Kavala, Greece, 1997, (Publication Title: Seventh Symposium on Oceanography and Fisheries, Κavala). @inproceedings{koutsoubas_dynamics_1997, title = {Dynamics of the physicochemical parameters in water column and in the sediments of the Gialova lagoon (NW Peloponnese, Ionian Sea)}, author = {D Koutsoubas and C Dounas and G Petihakis and C Arvanitidis and G Triantafyllou and E Dafnomili and S Zivanovic}, year = {1997}, date = {1997-01-01}, volume = {II}, pages = {351--353}, address = {Kavala, Greece}, note = {Publication Title: Seventh Symposium on Oceanography and Fisheries, Κavala}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Chatzifotis, S; Takeuchi, T Aquaculture, 158 (1-2), pp. 129–140, 1997, ISSN: 00448486. @article{chatzifotis_effect_1997-1, title = {Effect of supplemental camitine on body weight loss, proximate and lipid compositions and carnitine content of red sea bream (Pagrus major) during starvation}, author = {S Chatzifotis and T Takeuchi}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031457222&doi=10.1016%2fS0044-8486%2897%2900175-0&partnerID=40&md5=2050750033b443a4d28cf92926fcb924}, doi = {10.1016/S0044-8486(97)00175-0}, issn = {00448486}, year = {1997}, date = {1997-01-01}, journal = {Aquaculture}, volume = {158}, number = {1-2}, pages = {129--140}, abstract = {The effect of supplemental dietary carnitine on the body weight loss, lipid composition and carnitine content of dorsal muscle of red sea bream during starvation was investigated. Two experimental groups of red sea bream fingerlings were used. One group was fed a control diet (Diet 1; textless 0.09 g carnitine/kg feed) for 30 days prior to starvation while the second group was fed a carnitine-supplemented diet (Diet 2; 4 g carnitine/kg feed). Then fish were deprived of feed for 30 days. During the feeding period, fish fed Diet 2 accumulated free-carnitine in their dorsal muscle. The acid-soluble acylcarnitine content remained constant, indicating a redistribution of free and esterified carnitine. Although the long-chain acylcarnitine in the dorsal muscle increased during starvagion, no difference was observed in the long-chain acylcarnitine content between the carnitine and the control group. The higher concentration of carnitine in the diet prior to starvation clearly did not show any effect on body weight loss or on the proximate and fatty acid compositions of dorsal muscle nor on the fatty acid composition of the liver. Carnitine supplementation prior to starvation did not show any clear effect on lipid classes in dorsal muscle and liver or on crude lipid and water concentration in liver during starvation.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The effect of supplemental dietary carnitine on the body weight loss, lipid composition and carnitine content of dorsal muscle of red sea bream during starvation was investigated. Two experimental groups of red sea bream fingerlings were used. One group was fed a control diet (Diet 1; textless 0.09 g carnitine/kg feed) for 30 days prior to starvation while the second group was fed a carnitine-supplemented diet (Diet 2; 4 g carnitine/kg feed). Then fish were deprived of feed for 30 days. During the feeding period, fish fed Diet 2 accumulated free-carnitine in their dorsal muscle. The acid-soluble acylcarnitine content remained constant, indicating a redistribution of free and esterified carnitine. Although the long-chain acylcarnitine in the dorsal muscle increased during starvagion, no difference was observed in the long-chain acylcarnitine content between the carnitine and the control group. The higher concentration of carnitine in the diet prior to starvation clearly did not show any effect on body weight loss or on the proximate and fatty acid compositions of dorsal muscle nor on the fatty acid composition of the liver. Carnitine supplementation prior to starvation did not show any clear effect on lipid classes in dorsal muscle and liver or on crude lipid and water concentration in liver during starvation. |
Divanach, P; Papandroulakis, N; Anastasiadis, P; Koumoundouros, G; Kentouri, M Aquaculture, 156 , pp. 145 – 155, 1997. @article{divanach_effect_1997, title = {Effect of water currents on the development of skeletal deformities in sea bass (Dicentrarchus labtax L.) with functional swimbladder during postlarval and nursery phase}, author = {P Divanach and N Papandroulakis and P Anastasiadis and G Koumoundouros and M Kentouri}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030678081&partnerID=40&md5=ff2eb4edf54484b5987625d1168e5cac}, year = {1997}, date = {1997-01-01}, journal = {Aquaculture}, volume = {156}, pages = {145 -- 155}, abstract = {Lordosis in reared sea bass was previously related either to the absence of swimbladder, or to bad or late inflation of this organ when damages were irreversible. Our results prove that these explanations are insufficient and that similar deformations may occur frequently in fry with functional swimbladder during the early weaning phase, if currents in tanks are higher than 10 cm s-1.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Lordosis in reared sea bass was previously related either to the absence of swimbladder, or to bad or late inflation of this organ when damages were irreversible. Our results prove that these explanations are insufficient and that similar deformations may occur frequently in fry with functional swimbladder during the early weaning phase, if currents in tanks are higher than 10 cm s-1. |
Tsapakis, E; Karakassis, Ioannis; Xatziyanni, E; Maidanou, M Effects of aquaculture in three coastal areas Journal Article Fisheries News, 199 , pp. 90–95, 1997. @article{tsapakis_effects_1997, title = {Effects of aquaculture in three coastal areas}, author = {E Tsapakis and Ioannis Karakassis and E Xatziyanni and M Maidanou}, year = {1997}, date = {1997-01-01}, journal = {Fisheries News}, volume = {199}, pages = {90--95}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Larsson, D G J; Mylonas, C C; Zohar, Y; Crim, L W Canadian Journal of Fisheries and Aquatic Sciences, 54 (9), pp. 1957–1964, 1997, ISSN: 0706652X. @article{larsson_gonadotropin-releasing_1997, title = {Gonadotropin-releasing hormone analogue (GnRH-A) induces multiple ovulations of high-quality eggs in a cold-water, batch-spawning teleost, the yellowtail flounder (Pleuronectes ferrugineus)}, author = {D G J Larsson and C C Mylonas and Y Zohar and L W Crim}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031449685&doi=10.1139%2fcjfas-54-9-1957&partnerID=40&md5=52dbd73406a33867ec5f010c83f98ca6}, doi = {10.1139/cjfas-54-9-1957}, issn = {0706652X}, year = {1997}, date = {1997-01-01}, journal = {Canadian Journal of Fisheries and Aquatic Sciences}, volume = {54}, number = {9}, pages = {1957--1964}, abstract = {Sustained delivery systems for a gonadotropin-releasing hormone analogue (GnRH-A) were used for the first time in a cold-ocean teleost for inducing multiple ovulations. Intramuscular implants of 75-224 μg/kg GnRH-A ((D-Ala6,Pro9-NHEt)LHRH) were administered to female yellowtail flounder (Pleuronectes ferrugineus) either as a cholesterol pellet or as biodegradable microspheres. Females implanted with GnRH-A ovulated 3-4 weeks earlier than controls, producing multiple batches of high-quality eggs (average rates of fertilization 66-68% and hatching 55-60%); control fish eggs had significantly lower fertilization (39%) and hatching rates (25%). GnRH-A treatment doubled the egg production, synchronized the females, and shortened the interovulatory periods. The proportion of round, clear, and floating eggs lacking a perivitelline space before fertilization was an indicator of the fertilization (r2= 0.60) and hatching (r2 = 0.56) success. Moreover, egg collections of less than 10 mL varied greatly in quality, whereas larger batches, generally promoted by GnRH-A, consisted of relatively high-quality eggs. GnRH-A treated fish had increased plasma levels of estradiol- 17β 4 days after implantation. A model for prediction of the time between hormone treatment and first spawning (T; days) was developed using the initial follicle diameter (D; μm) as the only predictor (T = 365(D - 380)-082; r2 = 0.91).}, keywords = {}, pubstate = {published}, tppubtype = {article} } Sustained delivery systems for a gonadotropin-releasing hormone analogue (GnRH-A) were used for the first time in a cold-ocean teleost for inducing multiple ovulations. Intramuscular implants of 75-224 μg/kg GnRH-A ((D-Ala6,Pro9-NHEt)LHRH) were administered to female yellowtail flounder (Pleuronectes ferrugineus) either as a cholesterol pellet or as biodegradable microspheres. Females implanted with GnRH-A ovulated 3-4 weeks earlier than controls, producing multiple batches of high-quality eggs (average rates of fertilization 66-68% and hatching 55-60%); control fish eggs had significantly lower fertilization (39%) and hatching rates (25%). GnRH-A treatment doubled the egg production, synchronized the females, and shortened the interovulatory periods. The proportion of round, clear, and floating eggs lacking a perivitelline space before fertilization was an indicator of the fertilization (r2= 0.60) and hatching (r2 = 0.56) success. Moreover, egg collections of less than 10 mL varied greatly in quality, whereas larger batches, generally promoted by GnRH-A, consisted of relatively high-quality eggs. GnRH-A treated fish had increased plasma levels of estradiol- 17β 4 days after implantation. A model for prediction of the time between hormone treatment and first spawning (T; days) was developed using the initial follicle diameter (D; μm) as the only predictor (T = 365(D - 380)-082; r2 = 0.91). |
Volckaert, F; Alvarez, M C; Argenton, F; Bonhomme, F; Chatain, B; Colombo, L; Castilho, R; Chevassus, B; Gorshkova, G; Kohler, M; Magoulas, A; Martinez, G; McAndrew, B; Piferrer, F; Vandeputte, M; Zanuy, S Has time come for the genetic management of sea bass? Journal Article Aquaculture Europe, 22 (2), pp. 46–47, 1997. @article{volckaert_has_1997, title = {Has time come for the genetic management of sea bass?}, author = {F Volckaert and M C Alvarez and F Argenton and F Bonhomme and B Chatain and L Colombo and R Castilho and B Chevassus and G Gorshkova and M Kohler and A Magoulas and G Martinez and B McAndrew and F Piferrer and M Vandeputte and S Zanuy}, year = {1997}, date = {1997-01-01}, journal = {Aquaculture Europe}, volume = {22}, number = {2}, pages = {46--47}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Mylonas, C C; Gissis, A; Magnus, Y; Zohar, Y Aquaculture, 153 (3-4), pp. 301–311, 1997, ISSN: 00448486. @article{mylonas_hormonal_1997, title = {Hormonal changes in male white bass (Morone chrysops) and evaluation of milt quality after treatment with a sustained-release GnRHa delivery system}, author = {C C Mylonas and A Gissis and Y Magnus and Y Zohar}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030759556&doi=10.1016%2fS0044-8486%2897%2987566-7&partnerID=40&md5=46bd2d2d502a25d0f3ec6e54a305aba9}, doi = {10.1016/S0044-8486(97)87566-7}, issn = {00448486}, year = {1997}, date = {1997-01-01}, journal = {Aquaculture}, volume = {153}, number = {3-4}, pages = {301--311}, abstract = {Captive white bass, (Morone chrysops) were exposed to an increase in temperature and treated with a gonadotropin-releasing hormone agonist (GnRHa) delivery system during the spermiation period. Circulating levels of various reproductive hormones, and milt production and quality were examined before and after GnRHa treatment. Circulating levels of gonadotropin II (GtH II) prior to GnRHa treatment were below the assay detection limit (0.4 ng ml-1), while mean (±SEM) plasma levels of 17α,20β-dihydroxy-4-pregnen-3-one (17,20β-P) were 0.09 ± 0.03 ng ml-1 testosterone (T) levels were 0,79 ± 0.11 ng ml-1 and 11-ketotestosterone (11-KT) levels were 1.7 ± 0.3 ng ml-1. Treatment with the GnRHa delivery system induced significant increases in plasma GtH 11 and 17,20β-P after 7 days, whereas T and 11-KT were unaffected. Plasma 17α,20β,21-trihydroxy-4-pregnen-3-one (17,20β,21-P) remained unchanged during the experiment with a mean of 0.55 ± 0.05 ng ml-1. Mean total expressible milt increased significantly after treatment with the GnRHa delivery system, from 2.0 ± 0.1 ml kg-1 body weight on day 0 to 3.6 ± 0.5 ml kg-1 on day 7. Milt production remained constant in saline-injected control fish and averaged 2.1 ± 0.2 ml kg-1. Sperm density, motility and fertilization percentage of total inseminated eggs did not differ between milt from GnRHa- and saline-injected fish, and averaged 52 ± 2 x 109 spermatozoa ml-1, 50 ± 4% motile spermatozoa and 60 ± 5% fertilized eggs, respectively. These results demonstrate the effectiveness of sustained GnRHa treatment in enhancing mill production in white bass, without negatively affecting mill quality. It is assumed that enhancement of milt production is caused by high circulating GtH II levels, via the action of 17.20β-P.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Captive white bass, (Morone chrysops) were exposed to an increase in temperature and treated with a gonadotropin-releasing hormone agonist (GnRHa) delivery system during the spermiation period. Circulating levels of various reproductive hormones, and milt production and quality were examined before and after GnRHa treatment. Circulating levels of gonadotropin II (GtH II) prior to GnRHa treatment were below the assay detection limit (0.4 ng ml-1), while mean (±SEM) plasma levels of 17α,20β-dihydroxy-4-pregnen-3-one (17,20β-P) were 0.09 ± 0.03 ng ml-1 testosterone (T) levels were 0,79 ± 0.11 ng ml-1 and 11-ketotestosterone (11-KT) levels were 1.7 ± 0.3 ng ml-1. Treatment with the GnRHa delivery system induced significant increases in plasma GtH 11 and 17,20β-P after 7 days, whereas T and 11-KT were unaffected. Plasma 17α,20β,21-trihydroxy-4-pregnen-3-one (17,20β,21-P) remained unchanged during the experiment with a mean of 0.55 ± 0.05 ng ml-1. Mean total expressible milt increased significantly after treatment with the GnRHa delivery system, from 2.0 ± 0.1 ml kg-1 body weight on day 0 to 3.6 ± 0.5 ml kg-1 on day 7. Milt production remained constant in saline-injected control fish and averaged 2.1 ± 0.2 ml kg-1. Sperm density, motility and fertilization percentage of total inseminated eggs did not differ between milt from GnRHa- and saline-injected fish, and averaged 52 ± 2 x 109 spermatozoa ml-1, 50 ± 4% motile spermatozoa and 60 ± 5% fertilized eggs, respectively. These results demonstrate the effectiveness of sustained GnRHa treatment in enhancing mill production in white bass, without negatively affecting mill quality. It is assumed that enhancement of milt production is caused by high circulating GtH II levels, via the action of 17.20β-P. |
Borsa, P; Naciri, M; Bahri, L; Chikhi, L; de Leon, Garcia F J; Kotoulas, G; Bonhomme, F Infraspecific zoogeography of the Mediterranean: population genetic analysis on sixteen Atlanto-Mediterranean species (fishes and invertebrates) Journal Article Vie et Milieu, 47 , pp. 295 – 305, 1997. @article{borsa_infraspecific_1997-1, title = {Infraspecific zoogeography of the Mediterranean: population genetic analysis on sixteen Atlanto-Mediterranean species (fishes and invertebrates)}, author = {P Borsa and M Naciri and L Bahri and L Chikhi and F J Garcia de Leon and G Kotoulas and F Bonhomme}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0031403021&partnerID=40&md5=84cd00d266e65a028ccbf3c537e40b88}, year = {1997}, date = {1997-01-01}, journal = {Vie et Milieu}, volume = {47}, pages = {295 -- 305}, abstract = {The faunal relationships of the Atlantic and the Mediterranean have been affected by tectonic change in the Miocene, by climate change in the Pleistocene and by hydrological discontinuity. We use a population genetics approach to the biogeography of the Mediterranean marine fauna, in particular to describe the level of recent or present-day exchanges with the Atlantic. The level of genetic differences between populations was estimated from published and unpublished data on sixteen species from the northeastern Atlantic and the Mediterranean. For a majority of species, either tropical or subtropical or boreal fishes, or coastal invertebrates, a moderately strong to strong genetic cline between each side of the Gibraltar strait area was observed. Such a pattern was also observed in a proportion of species between each side of the Sicilian-Tunisian strait. In a limited number of cases, the geographic patterns of population genetic structure however conformed with the expectations from an isolation-by-distance model. The molecular phylogeographic approach in a boreal species, the flounder Platichthys flesus, led to the inferrence of the historical movements of colonisation and geographic isolation of the populations. A similar approach used in a tropical species (the Spanish sardine Sardinella aurita) and a cosmopolitan species (the grey mullet Mugil cephalus) revealed close genetic relationships between Mediterranean and west-tropical Atlantic populations. We analyse the possible implications of these findings to the systematics of the Mediterranean populations and we speculate about the future of boreal species vis-a-vis the present climatic change. We debate on various hypotheses for the maintaining of abrupt genetic clines in the marine environment.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The faunal relationships of the Atlantic and the Mediterranean have been affected by tectonic change in the Miocene, by climate change in the Pleistocene and by hydrological discontinuity. We use a population genetics approach to the biogeography of the Mediterranean marine fauna, in particular to describe the level of recent or present-day exchanges with the Atlantic. The level of genetic differences between populations was estimated from published and unpublished data on sixteen species from the northeastern Atlantic and the Mediterranean. For a majority of species, either tropical or subtropical or boreal fishes, or coastal invertebrates, a moderately strong to strong genetic cline between each side of the Gibraltar strait area was observed. Such a pattern was also observed in a proportion of species between each side of the Sicilian-Tunisian strait. In a limited number of cases, the geographic patterns of population genetic structure however conformed with the expectations from an isolation-by-distance model. The molecular phylogeographic approach in a boreal species, the flounder Platichthys flesus, led to the inferrence of the historical movements of colonisation and geographic isolation of the populations. A similar approach used in a tropical species (the Spanish sardine Sardinella aurita) and a cosmopolitan species (the grey mullet Mugil cephalus) revealed close genetic relationships between Mediterranean and west-tropical Atlantic populations. We analyse the possible implications of these findings to the systematics of the Mediterranean populations and we speculate about the future of boreal species vis-a-vis the present climatic change. We debate on various hypotheses for the maintaining of abrupt genetic clines in the marine environment. |
Borsa, P; Naciri, M; Bahri, L; Chikhi, L; de Leon, Garcia F J; Kotoulas, G; Bonhomme, F Vie et Milieu, 47 (4), pp. 295–305, 1997, ISSN: 02408759. @article{borsa_infraspecific_1997, title = {Infraspecific zoogeography of the Mediterranean: population genetic analysis on sixteen Atlanto-Mediterranean species (fishes and invertebrates) [Zoogeographie infra-specifique de la Mer Mediterranee: analyse des donnees genetiques populationnelles sur seize especes atlanto-mediterraneennes (poissons et invertebres)]}, author = {P Borsa and M Naciri and L Bahri and L Chikhi and F J Garcia de Leon and G Kotoulas and F Bonhomme}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031403021&partnerID=40&md5=84cd00d266e65a028ccbf3c537e40b88}, issn = {02408759}, year = {1997}, date = {1997-01-01}, journal = {Vie et Milieu}, volume = {47}, number = {4}, pages = {295--305}, abstract = {The faunal relationships of the Atlantic and the Mediterranean have been affected by tectonic change in the Miocene, by climate change in the Pleistocene and by hydrological discontinuity. We use a population genetics approach to the biogeography of the Mediterranean marine fauna, in particular to describe the level of recent or present-day exchanges with the Atlantic. The level of genetic differences between populations was estimated from published and unpublished data on sixteen species from the northeastern Atlantic and the Mediterranean. For a majority of species, either tropical or subtropical or boreal fishes, or coastal invertebrates, a moderately strong to strong genetic cline between each side of the Gibraltar strait area was observed. Such a pattern was also observed in a proportion of species between each side of the Sicilian-Tunisian strait. In a limited number of cases, the geographic patterns of population genetic structure however conformed with the expectations from an isolation-by-distance model. The molecular phylogeographic approach in a boreal species, the flounder Platichthys flesus, led to the inferrence of the historical movements of colonisation and geographic isolation of the populations. A similar approach used in a tropical species (the Spanish sardine Sardinella aurita) and a cosmopolitan species (the grey mullet Mugil cephalus) revealed close genetic relationships between Mediterranean and west-tropical Atlantic populations. We analyse the possible implications of these findings to the systematics of the Mediterranean populations and we speculate about the future of boreal species vis-a-vis the present climatic change. We debate on various hypotheses for the maintaining of abrupt genetic clines in the marine environment.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The faunal relationships of the Atlantic and the Mediterranean have been affected by tectonic change in the Miocene, by climate change in the Pleistocene and by hydrological discontinuity. We use a population genetics approach to the biogeography of the Mediterranean marine fauna, in particular to describe the level of recent or present-day exchanges with the Atlantic. The level of genetic differences between populations was estimated from published and unpublished data on sixteen species from the northeastern Atlantic and the Mediterranean. For a majority of species, either tropical or subtropical or boreal fishes, or coastal invertebrates, a moderately strong to strong genetic cline between each side of the Gibraltar strait area was observed. Such a pattern was also observed in a proportion of species between each side of the Sicilian-Tunisian strait. In a limited number of cases, the geographic patterns of population genetic structure however conformed with the expectations from an isolation-by-distance model. The molecular phylogeographic approach in a boreal species, the flounder Platichthys flesus, led to the inferrence of the historical movements of colonisation and geographic isolation of the populations. A similar approach used in a tropical species (the Spanish sardine Sardinella aurita) and a cosmopolitan species (the grey mullet Mugil cephalus) revealed close genetic relationships between Mediterranean and west-tropical Atlantic populations. We analyse the possible implications of these findings to the systematics of the Mediterranean populations and we speculate about the future of boreal species vis-a-vis the present climatic change. We debate on various hypotheses for the maintaining of abrupt genetic clines in the marine environment. |
Karakassis, Ioannis; Tsapakis, E; Xatziyanni, E; Maidanou, M; Papadopoulou, K -N; Pita, P; Smith, C Interaction of Aquaculture and the Marine Environment. Methodology and preliminary results Journal Article Fisheries News, 192 , pp. 40–45, 1997. @article{karakassis_interaction_1997, title = {Interaction of Aquaculture and the Marine Environment. Methodology and preliminary results}, author = {Ioannis Karakassis and E Tsapakis and E Xatziyanni and M Maidanou and K -N Papadopoulou and P Pita and C Smith}, year = {1997}, date = {1997-01-01}, journal = {Fisheries News}, volume = {192}, pages = {40--45}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Tselepides, A; Papadopoulou, K -N; Podaras, D; Plaiti, W; Koutsoubas, D; Pantazoglou, F Macrobenthic community structure in Cretan Sea. Inproceedings pp. 233–236, Kavala, Greece, 1997, (Publication Title: the 5th National Symposium on Oceanography and Fisheries). @inproceedings{tselepides_macrobenthic_1997, title = {Macrobenthic community structure in Cretan Sea.}, author = {A Tselepides and K -N Papadopoulou and D Podaras and W Plaiti and D Koutsoubas and F Pantazoglou}, year = {1997}, date = {1997-01-01}, pages = {233--236}, address = {Kavala, Greece}, note = {Publication Title: the 5th National Symposium on Oceanography and Fisheries}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Schulz, R W; Wind, Van Der F; Janssen-Dommerholt, C; Peute, J; Mylonas, C C; Zohar, Y; Swanson, P; Goos, H J T Modulation of testicular androgen production in adolescent African catfish (Clarias gariepinus) Journal Article General and Comparative Endocrinology, 108 (1), pp. 56–66, 1997, ISSN: 00166480, (Publisher: Academic Press Inc.). @article{schulz_modulation_1997, title = {Modulation of testicular androgen production in adolescent African catfish (Clarias gariepinus)}, author = {R W Schulz and F Van Der Wind and C Janssen-Dommerholt and J Peute and C C Mylonas and Y Zohar and P Swanson and H J T Goos}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031260440&doi=10.1006%2fgcen.1997.6951&partnerID=40&md5=13ca91398eaf6fdeffb0cdab1a93756c}, doi = {10.1006/gcen.1997.6951}, issn = {00166480}, year = {1997}, date = {1997-01-01}, journal = {General and Comparative Endocrinology}, volume = {108}, number = {1}, pages = {56--66}, abstract = {At 6 months of age the first spermatozoa appear in the testes of the African catfish considered to be adolescent, since the development to adulthood (12 months of age) is accompanied by further morphological and functional differentiation of Leydig cells. There are increasing plasma levels of 11-ketotestosterone (11-KT) and an increasing responsiveness to luteinizing hormone (LH) of testicular androgen secretion in vitro. Whether treatment of adolescent males with key hormones of the brain-pituitary-gonad axis [gonadotropin-releasing hormone (GnRH), LH, and 11-KT] affects the testicular steroidogenic response to a challenge with LH in vitro 7 days later has been investigated. Injection of GnRH (2.5 μg chicken GnRH-II per kilogram of body weight), LH (25 μg/kg), or a high dose of 11-KT (50 μg/kg) down-regulated basal and LH-stimulated testicular androgen secretion to a minimum of 35% of control values. Treatment with LH was, moreover, associated with changes in the ultrastructure of Leydig cell mitochondria which were either swollen and had a less electron-dense matrix or showed an elongated shape. Conversely, a moderate dose of 11-KT (20 μg/kg) enhanced LH- stimulated, but not basal, androgen secretion in vitro to a maximum of 190% of control values. In view of the generally low LH plasma levels and of the steadily increasing 11-KT plasma levels during puberty, 11-KT may be involved in the up-regulation of the testicular steroidogenic capacity observed during development to full maturity.}, note = {Publisher: Academic Press Inc.}, keywords = {}, pubstate = {published}, tppubtype = {article} } At 6 months of age the first spermatozoa appear in the testes of the African catfish considered to be adolescent, since the development to adulthood (12 months of age) is accompanied by further morphological and functional differentiation of Leydig cells. There are increasing plasma levels of 11-ketotestosterone (11-KT) and an increasing responsiveness to luteinizing hormone (LH) of testicular androgen secretion in vitro. Whether treatment of adolescent males with key hormones of the brain-pituitary-gonad axis [gonadotropin-releasing hormone (GnRH), LH, and 11-KT] affects the testicular steroidogenic response to a challenge with LH in vitro 7 days later has been investigated. Injection of GnRH (2.5 μg chicken GnRH-II per kilogram of body weight), LH (25 μg/kg), or a high dose of 11-KT (50 μg/kg) down-regulated basal and LH-stimulated testicular androgen secretion to a minimum of 35% of control values. Treatment with LH was, moreover, associated with changes in the ultrastructure of Leydig cell mitochondria which were either swollen and had a less electron-dense matrix or showed an elongated shape. Conversely, a moderate dose of 11-KT (20 μg/kg) enhanced LH- stimulated, but not basal, androgen secretion in vitro to a maximum of 190% of control values. In view of the generally low LH plasma levels and of the steadily increasing 11-KT plasma levels during puberty, 11-KT may be involved in the up-regulation of the testicular steroidogenic capacity observed during development to full maturity. |
Alexis, M N; Karanikolas, K K; Richards, R H Pathological findings owing to the lack of ascorbic acid in cultured gilthead bream (Sparus aurata L.) Journal Article Aquaculture, 151 , pp. 209 – 218, 1997. @article{alexis_pathological_1997, title = {Pathological findings owing to the lack of ascorbic acid in cultured gilthead bream (Sparus aurata L.)}, author = {M N Alexis and K K Karanikolas and R H Richards}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030744502&partnerID=40&md5=a2139d0a7cbd31d6263725d17ad392b7}, year = {1997}, date = {1997-01-01}, journal = {Aquaculture}, volume = {151}, pages = {209 -- 218}, abstract = {The appearance of pathological signs owing to vitamin C deficiency and the wound healing response were followed in experiments with gilthead bream, initial weight 0.5 g, fed with increasing levels of ascorbic acid in the diets. The levels of ascorbic acid used ranged from 0 to 3,2 g kg-1 diet. Certain pathological signs such as extensive tubular damage, glomerulonephritis, and inflammatory response of the haemopoetic tissue producing granuloma and in some cases extending in the nearby tissues and organs, appeared in all fish fed the vitamin C deficient diet, while fish fed the diet supplemented with 50 mg ascorbate per kilogram of diet showed only damage to renal tubules. The gross deficiency signs observed were anorexia, scale loss, depigmentation, internal and external haemorrhages. Mortalities reached a high level after the first month of rearing. The wound healing response showed a direct correlation to ascorbate level in the diet. The unknown etiology of granulomatosis observed by other researchers in cultured seabream may be related to vitamin C deficiency, since in this experiment, it produced the same kidney pathology.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The appearance of pathological signs owing to vitamin C deficiency and the wound healing response were followed in experiments with gilthead bream, initial weight 0.5 g, fed with increasing levels of ascorbic acid in the diets. The levels of ascorbic acid used ranged from 0 to 3,2 g kg-1 diet. Certain pathological signs such as extensive tubular damage, glomerulonephritis, and inflammatory response of the haemopoetic tissue producing granuloma and in some cases extending in the nearby tissues and organs, appeared in all fish fed the vitamin C deficient diet, while fish fed the diet supplemented with 50 mg ascorbate per kilogram of diet showed only damage to renal tubules. The gross deficiency signs observed were anorexia, scale loss, depigmentation, internal and external haemorrhages. Mortalities reached a high level after the first month of rearing. The wound healing response showed a direct correlation to ascorbate level in the diet. The unknown etiology of granulomatosis observed by other researchers in cultured seabream may be related to vitamin C deficiency, since in this experiment, it produced the same kidney pathology. |
Pitta, P; Giannakourou, A; Divanach, P; Kentouri, M Planktonic food web in marine mesocosms in the Eastern Mediterranean: Bottom-up or top-down regulation? Journal Article Hydrobiologia, 363 , pp. 97 – 105, 1997. @article{pitta_planktonic_1997, title = {Planktonic food web in marine mesocosms in the Eastern Mediterranean: Bottom-up or top-down regulation?}, author = {P Pitta and A Giannakourou and P Divanach and M Kentouri}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0031402824&partnerID=40&md5=d32feeb1ddf43866aab11765538d6bfa}, year = {1997}, date = {1997-01-01}, journal = {Hydrobiologia}, volume = {363}, pages = {97 -- 105}, abstract = {A mesocosm experiment was conducted in order to study the structure of the planktonic food web. The dynamics of pico-, nano- and microplankton populations were followed during 40 days in four large (40 m3) enclosures. In three tanks a gradient of added nutrients (nitrogen and phosphorus) was applied, while a fourth tank was used as a control. On day 14, the top predator (sea bream Sparus aurata larvae) was introduced into the tanks and part of the water column in each tank was isolated in a plastic bag without fish larvae, to act as a control for predation. Physical parameters, chlorophyll a and nutrient concentrations, as well as plankton concentrations were monitored. A diatom bloom was observed in all four tanks, in the first phase ending with silicate depletion. Flagellate and dinoflagellate abundance subsequently increased, these organisms being limited by zooplankton grazing. The zooplankton populations were controlled by both resources (mostly flagellates) and predation (by fish larvae) as indicated by the results of the control experiments.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A mesocosm experiment was conducted in order to study the structure of the planktonic food web. The dynamics of pico-, nano- and microplankton populations were followed during 40 days in four large (40 m3) enclosures. In three tanks a gradient of added nutrients (nitrogen and phosphorus) was applied, while a fourth tank was used as a control. On day 14, the top predator (sea bream Sparus aurata larvae) was introduced into the tanks and part of the water column in each tank was isolated in a plastic bag without fish larvae, to act as a control for predation. Physical parameters, chlorophyll a and nutrient concentrations, as well as plankton concentrations were monitored. A diatom bloom was observed in all four tanks, in the first phase ending with silicate depletion. Flagellate and dinoflagellate abundance subsequently increased, these organisms being limited by zooplankton grazing. The zooplankton populations were controlled by both resources (mostly flagellates) and predation (by fish larvae) as indicated by the results of the control experiments. |
Mylonas, C C; Scott, A P; Zohar, Y General and Comparative Endocrinology, 108 (2), pp. 223–236, 1997, ISSN: 00166480, (Publisher: Academic Press Inc.). @article{mylonas_plasma_1997, title = {Plasma gonadotropin II, sex steroids, and thyroid hormones in wild striped bass (Morone saxatilis) during spermiation and final oocyte maturation}, author = {C C Mylonas and A P Scott and Y Zohar}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030728062&doi=10.1006%2fgcen.1997.6967&partnerID=40&md5=e2e788f3e08d9b279b44c1e17b96812f}, doi = {10.1006/gcen.1997.6967}, issn = {00166480}, year = {1997}, date = {1997-01-01}, journal = {General and Comparative Endocrinology}, volume = {108}, number = {2}, pages = {223--236}, abstract = {The blood levels of gonadotropin II (GtH II), sex-steroid hormones, and thyroid hormones were determined in wild spermiating male striped bass (Morone saxatilis) in males and in females at various stages of final oocyte maturation (FOM), captured on their spawning grounds. The progression of spermiation was associated with increases in plasma GtH II and decreases in plasma testosterone (T), 11-ketotestosterone, and thyroxine (T4). Plasma triiodothyronine (T3) remained at high and relatively unchanged levels. Plasma levels of 17,20β-dihydroxy-4-pregnen-3-one (17,20β-P) and 17,20β,21-trihydroxy-4-pregnen-3-one (17,20β,21-P), the proposed maturation-inducing steroids (MIS) in striped bass, were low and unchanged during the same period. It was concluded that low progestogen levels are adequate to induce spermiation in striped bass, and that higher levels may be associated with spawning behavior. In the females, based on the profiles of the studied hormones, FOM was separated into two phases. Early FOM, which included germinal vesicle (GV) migration and lipid-droplet coalescence, was associated with elevations in plasma GtH II, T, and estradiol 17β. Late FOM, which included GV breakdown and yolk-globule coalescence, was associated with a further surge in plasma GtH II, increases in the levels of the two MIS, mainly 17,20β-P, and a drop in T4. Plasma T3 levels did not change during FOM. Examination of conjugated steroids demonstrated, in the males, a reduction in conjugated androgens at the peak of the spawning season and, in the females, a small increase in conjugated 17,20β-dihydroxylated and 5β- reduced, 3α-hydroxylated steroids after spawning. This is the most comprehensive report, to date, on the endocrine regulation of gonadal maturation in wild striped bass, demonstrating that a two-stage process of FOM is regulated by different endocrine signals, providing further evidence for the involvement of 17,20β-P as a MIS in the females, and indicating that both males and females are in an euthyroid state during the spawning season.}, note = {Publisher: Academic Press Inc.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The blood levels of gonadotropin II (GtH II), sex-steroid hormones, and thyroid hormones were determined in wild spermiating male striped bass (Morone saxatilis) in males and in females at various stages of final oocyte maturation (FOM), captured on their spawning grounds. The progression of spermiation was associated with increases in plasma GtH II and decreases in plasma testosterone (T), 11-ketotestosterone, and thyroxine (T4). Plasma triiodothyronine (T3) remained at high and relatively unchanged levels. Plasma levels of 17,20β-dihydroxy-4-pregnen-3-one (17,20β-P) and 17,20β,21-trihydroxy-4-pregnen-3-one (17,20β,21-P), the proposed maturation-inducing steroids (MIS) in striped bass, were low and unchanged during the same period. It was concluded that low progestogen levels are adequate to induce spermiation in striped bass, and that higher levels may be associated with spawning behavior. In the females, based on the profiles of the studied hormones, FOM was separated into two phases. Early FOM, which included germinal vesicle (GV) migration and lipid-droplet coalescence, was associated with elevations in plasma GtH II, T, and estradiol 17β. Late FOM, which included GV breakdown and yolk-globule coalescence, was associated with a further surge in plasma GtH II, increases in the levels of the two MIS, mainly 17,20β-P, and a drop in T4. Plasma T3 levels did not change during FOM. Examination of conjugated steroids demonstrated, in the males, a reduction in conjugated androgens at the peak of the spawning season and, in the females, a small increase in conjugated 17,20β-dihydroxylated and 5β- reduced, 3α-hydroxylated steroids after spawning. This is the most comprehensive report, to date, on the endocrine regulation of gonadal maturation in wild striped bass, demonstrating that a two-stage process of FOM is regulated by different endocrine signals, providing further evidence for the involvement of 17,20β-P as a MIS in the females, and indicating that both males and females are in an euthyroid state during the spawning season. |
Tsagkarakou, Anastasia; Navajas, Maria; Lagnel, Jacques; Pasteur, Nicole Population structure in the spider mite Tetranychus urticae (Acari: Tetranychidae) from Crete based on multiple allozymes Journal Article Heredity, 78 (1), pp. 84–92, 1997, ISSN: 0018-067X, 1365-2540. @article{tsagkarakou_population_1997, title = {Population structure in the spider mite Tetranychus urticae (Acari: Tetranychidae) from Crete based on multiple allozymes}, author = {Anastasia Tsagkarakou and Maria Navajas and Jacques Lagnel and Nicole Pasteur}, url = {http://www.nature.com/articles/hdy199710}, doi = {10.1038/hdy.1997.10}, issn = {0018-067X, 1365-2540}, year = {1997}, date = {1997-01-01}, urldate = {2020-08-18}, journal = {Heredity}, volume = {78}, number = {1}, pages = {84--92}, abstract = {The polymorphism of four isozymes was studied on single females of Tetranychus urticae from Crete (Greece), using an isoelectric focusing technique. Genetic differentiation was found to be correlated with distance but not with the species of colonized host-plants. Thus no differentiation was observed between samples collected on citrus trees, tomato, pumpkin, okra or weed plants located within a 50 m2 area, showing that at this geographical scale T. urticae, populations are panmictic. In contrast, samples from plants at 150 m or more from one another displayed a significant genetic differentiation. These results are discussed in relation to the known pattern of migration in the species.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The polymorphism of four isozymes was studied on single females of Tetranychus urticae from Crete (Greece), using an isoelectric focusing technique. Genetic differentiation was found to be correlated with distance but not with the species of colonized host-plants. Thus no differentiation was observed between samples collected on citrus trees, tomato, pumpkin, okra or weed plants located within a 50 m2 area, showing that at this geographical scale T. urticae, populations are panmictic. In contrast, samples from plants at 150 m or more from one another displayed a significant genetic differentiation. These results are discussed in relation to the known pattern of migration in the species. |
Psara, S; Tselepides, A; Ignatiades, L; Dafnomili, E Primary production estimates in the oligotrophic Cretan sea Inproceedings pp. 225–229, 1997, (Publication Title: 5th Pan-Hellenic Symposium of Oceanography and Fisheries). @inproceedings{psara_primary_1997, title = {Primary production estimates in the oligotrophic Cretan sea}, author = {S Psara and A Tselepides and L Ignatiades and E Dafnomili}, year = {1997}, date = {1997-01-01}, volume = {I}, pages = {225--229}, note = {Publication Title: 5th Pan-Hellenic Symposium of Oceanography and Fisheries}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Mylonas, C C; Magnus, Y; Klebanov, Y; Gissis, A; Zohar, Y Reproductive biology and endocrine regulation of final oocyte maturation of captive white bass Journal Article Journal of Fish Biology, 51 (2), pp. 234–250, 1997, ISSN: 00221112. @article{mylonas_reproductive_1997, title = {Reproductive biology and endocrine regulation of final oocyte maturation of captive white bass}, author = {C C Mylonas and Y Magnus and Y Klebanov and A Gissis and Y Zohar}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030741032&doi=10.1006%2fjfbi.1997.0433&partnerID=40&md5=aa2b0d7a5082efd22a1935123608e83a}, doi = {10.1006/jfbi.1997.0433}, issn = {00221112}, year = {1997}, date = {1997-01-01}, journal = {Journal of Fish Biology}, volume = {51}, number = {2}, pages = {234--250}, abstract = {The ovarian development, and plasma levels of gonadotropin II (GtH II) and sex-steroid hormones at the end of vitellogenesis were examined in captive white bass Morone chrysops. The changes in plasma hormone levels and oocyte morphology associated with gonadotropin-releasing hormone agonist (GnRHa)-induced final oocyte maturation (FOM) were studied. Although plasma 17β-oestradiol (E2) and oocyte diameter increased, there were no changes in GtH II, testosterone (T), 17,20β-dihydroxy-4-pregnen-3-one (17,20β-P) or 17,20β,21-dihydroxy-4-pregnen-3-one (17,20β,21-P) in non-hormone-treated females, and no FOM was observed. Treatment with a sustained-release GnRHa delivery system (GnRHa implant) induced two FOM cycles separated by about 24 h, with the release of approximately equal numbers of eggs in each spawn. Plasma GtH II levels were elevated significantly throughout FOM, reaching a maximum of 9.07 ± 1.55 ng ml-1 in ovulated fish. Both plasma E2 and T increased soon after the GnRHa treatment, but E2 declined in fish undergoing germinal vesicle (GV) migration. Plasma T increased further during FOM (7.55 ± 2.87 ng ml-1), but declined precipitously at ovulation. A surge in plasma 17,20β-P and 17,20β,21-P (4.11 ± 0.97 ng ml-1 and 3.10 ± 0.77 ng ml-1, respectively) was observed in females undergoing GV breakdown (GVBD). Based on the involvement of different sex-steroid hormones, FOM was separated into two stages. Early FOM included lipid-droplet coalescence and GV migration, and was associated with elevations in plasma GtH II and T. Late FOM included GVBD and yolk-globule coalescence, and was associated with elevations in plasma GtH II, 17,20β-P and 17,20β,21-P. The results of this study point to the absence of a surge in plasma GtH II as the missing link in the reproductive axis responsible for the failure of captive white bass to undergo FOM at the end of vitellogenesis. Sustained elevation of plasma GtH II via treatment with a GnRHa implant induced two consecutive spawns with an overall egg production two- to eightfold higher than previously obtained from captive broodstocks, and similar to annual egg production values reported for wild fish.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The ovarian development, and plasma levels of gonadotropin II (GtH II) and sex-steroid hormones at the end of vitellogenesis were examined in captive white bass Morone chrysops. The changes in plasma hormone levels and oocyte morphology associated with gonadotropin-releasing hormone agonist (GnRHa)-induced final oocyte maturation (FOM) were studied. Although plasma 17β-oestradiol (E2) and oocyte diameter increased, there were no changes in GtH II, testosterone (T), 17,20β-dihydroxy-4-pregnen-3-one (17,20β-P) or 17,20β,21-dihydroxy-4-pregnen-3-one (17,20β,21-P) in non-hormone-treated females, and no FOM was observed. Treatment with a sustained-release GnRHa delivery system (GnRHa implant) induced two FOM cycles separated by about 24 h, with the release of approximately equal numbers of eggs in each spawn. Plasma GtH II levels were elevated significantly throughout FOM, reaching a maximum of 9.07 ± 1.55 ng ml-1 in ovulated fish. Both plasma E2 and T increased soon after the GnRHa treatment, but E2 declined in fish undergoing germinal vesicle (GV) migration. Plasma T increased further during FOM (7.55 ± 2.87 ng ml-1), but declined precipitously at ovulation. A surge in plasma 17,20β-P and 17,20β,21-P (4.11 ± 0.97 ng ml-1 and 3.10 ± 0.77 ng ml-1, respectively) was observed in females undergoing GV breakdown (GVBD). Based on the involvement of different sex-steroid hormones, FOM was separated into two stages. Early FOM included lipid-droplet coalescence and GV migration, and was associated with elevations in plasma GtH II and T. Late FOM included GVBD and yolk-globule coalescence, and was associated with elevations in plasma GtH II, 17,20β-P and 17,20β,21-P. The results of this study point to the absence of a surge in plasma GtH II as the missing link in the reproductive axis responsible for the failure of captive white bass to undergo FOM at the end of vitellogenesis. Sustained elevation of plasma GtH II via treatment with a GnRHa implant induced two consecutive spawns with an overall egg production two- to eightfold higher than previously obtained from captive broodstocks, and similar to annual egg production values reported for wild fish. |
Koutsoubas, D; Arvanitidis, C; Petihakis, G; Drummond, L; Dounas, C Structure and dynamics of the macrobenthic populations in Gialova lagoon (Ionian Sea) Inproceedings 1997, (Publication Title: Seventh Symposium on Oceanography and Fisheries, Κavala). @inproceedings{koutsoubas_structure_1997, title = {Structure and dynamics of the macrobenthic populations in Gialova lagoon (Ionian Sea)}, author = {D Koutsoubas and C Arvanitidis and G Petihakis and L Drummond and C Dounas}, year = {1997}, date = {1997-01-01}, volume = {II}, note = {Publication Title: Seventh Symposium on Oceanography and Fisheries, Κavala}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Chatzifotis, S; Takeuchi, T; Watanabe, T; Satoh, S The Effect of Dietary Carnitine Supplementation on Growth of Rainbow Trout Fingerlings Journal Article Fisheries Science, 63 (2), pp. 321–322, 1997, ISSN: 09199268, (Publisher: Blackwell Publishing). @article{chatzifotis_effect_1997, title = {The Effect of Dietary Carnitine Supplementation on Growth of Rainbow Trout Fingerlings}, author = {S Chatzifotis and T Takeuchi and T Watanabe and S Satoh}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0000426025&doi=10.2331%2ffishsci.63.321&partnerID=40&md5=eaacc3243620e4ec5c812ae3c67906b5}, doi = {10.2331/fishsci.63.321}, issn = {09199268}, year = {1997}, date = {1997-01-01}, journal = {Fisheries Science}, volume = {63}, number = {2}, pages = {321--322}, note = {Publisher: Blackwell Publishing}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Arvanitidis, C; Koukouras, A The genus Paradiopatra (Polychaeta, Onuphidae) in the Mediterranean with the description of Paradiopatra calliopae sp. nov. Journal Article Ophelia, 46 (1), pp. 51–63, 1997, ISSN: 00785326. @article{arvanitidis_genus_1997, title = {The genus Paradiopatra (Polychaeta, Onuphidae) in the Mediterranean with the description of Paradiopatra calliopae sp. nov.}, author = {C Arvanitidis and A Koukouras}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030893558&doi=10.1080%2f00785326.1997.10432477&partnerID=40&md5=493ee746ab970481fdc7617b2e1a3eba}, doi = {10.1080/00785326.1997.10432477}, issn = {00785326}, year = {1997}, date = {1997-01-01}, journal = {Ophelia}, volume = {46}, number = {1}, pages = {51--63}, abstract = {Sampling in circalittoral and bathyal zones of the North Aegean Sea, yielded a considerable number of specimens belonging to two species of the genus Paradiopatra Ehlers, 1887: P. quadricuspis (M. Sars, 1872) and P. calliopae sp. nov. P. quadricuspis from the North Aegean show slight differences from the type material. In addition, some features of the species, not reported by previous authors, are given. Also, the holotype of the Atlantic species P. bihanica (Intes & Le Loeuff, 1975) was re-examined and useful conclusions about the status of this species and its distinction from the new species are drawn. Re-examination of a specimen from the Ionian Sea, reported as Onuphis lepta, shows that it possibly belongs to the new species. The new species is compared with its closest congeners (P. quadricuspis, P. bihanica, and P. fauchaldi (Kirkegaard, 1988)) and the characters distinguishing them are given. The status of the genus in the Mediterranean is discussed. © 1997 Taylor & Francis Group, LLC.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Sampling in circalittoral and bathyal zones of the North Aegean Sea, yielded a considerable number of specimens belonging to two species of the genus Paradiopatra Ehlers, 1887: P. quadricuspis (M. Sars, 1872) and P. calliopae sp. nov. P. quadricuspis from the North Aegean show slight differences from the type material. In addition, some features of the species, not reported by previous authors, are given. Also, the holotype of the Atlantic species P. bihanica (Intes & Le Loeuff, 1975) was re-examined and useful conclusions about the status of this species and its distinction from the new species are drawn. Re-examination of a specimen from the Ionian Sea, reported as Onuphis lepta, shows that it possibly belongs to the new species. The new species is compared with its closest congeners (P. quadricuspis, P. bihanica, and P. fauchaldi (Kirkegaard, 1988)) and the characters distinguishing them are given. The status of the genus in the Mediterranean is discussed. © 1997 Taylor & Francis Group, LLC. |
Hatziyanni, E; Papadopoulou, K -N; Plaiti, W; Maidanou, M; Karakassis, I The structure of macrobenthic communities in three coastal areas of intensive fish-culture. Inproceedings pp. 223–226, Kavala, Greece,, 1997, (Publication Title: The 5th Pan-Hellenic Symposium of Oceanography and Fisheries). @inproceedings{hatziyanni_structure_1997, title = {The structure of macrobenthic communities in three coastal areas of intensive fish-culture.}, author = {E Hatziyanni and K -N Papadopoulou and W Plaiti and M Maidanou and I Karakassis}, year = {1997}, date = {1997-01-01}, volume = {2}, pages = {223--226}, address = {Kavala, Greece,}, note = {Publication Title: The 5th Pan-Hellenic Symposium of Oceanography and Fisheries}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
1996 |
Kristoffersen, JB; Salvanes, AGV A comparative analysis of the growth history of Maurolicus muelleri in the Norwegian Sea and west Norwegian fjords Inproceedings Kristoffersen, JB (Ed.): International symposium on the role of forage fishes in marine ecosystems, Anchorage November 13-16, 1996, 1996. @inproceedings{kristoffersen_comparative_1996, title = {A comparative analysis of the growth history of Maurolicus muelleri in the Norwegian Sea and west Norwegian fjords}, author = {JB Kristoffersen and AGV Salvanes}, editor = {JB Kristoffersen}, year = {1996}, date = {1996-11-01}, booktitle = {International symposium on the role of forage fishes in marine ecosystems, Anchorage November 13-16, 1996}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Kristoffersen, JB; Salvanes, AGV; Bergstad, OA; Bjelland, O; Ullebust, H; Hansen, K; Hordnes, M; Torkhildsen, S; Katsarou, E; Skjæråsen, JE The mesopelagic and demersal fishes of the northeastern Norwegian Sea and mid- and west Norwegian fjords Technical Report Department of Fisheries and Marine Biology, University of Bergen Bergen, Norway, (21), 1996, (Place: Bergen Publisher: Department of Fisheries and Marine Biology, University of Bergen). @techreport{kristoffersen_mesopelagic_1996, title = {The mesopelagic and demersal fishes of the northeastern Norwegian Sea and mid- and west Norwegian fjords}, author = {JB Kristoffersen and AGV Salvanes and OA Bergstad and O Bjelland and H Ullebust and K Hansen and M Hordnes and S Torkhildsen and E Katsarou and JE Skjæråsen}, year = {1996}, date = {1996-09-01}, number = {21}, pages = {1--16}, address = {Bergen, Norway}, institution = {Department of Fisheries and Marine Biology, University of Bergen}, note = {Place: Bergen Publisher: Department of Fisheries and Marine Biology, University of Bergen}, keywords = {}, pubstate = {published}, tppubtype = {techreport} } |
Mylonas, C C; Magnus, Y; Gissis, A; Klebanov, Y; Zohar, Y Aquaculture, 140 (3), pp. 265–280, 1996, ISSN: 00448486, (Publisher: Elsevier). @article{mylonas_application_1996, title = {Application of controlled-release, GnRHa-delivery systems in commercial production of white bass X striped bass hybrids (sunshine bass), using captive broodstocks}, author = {C C Mylonas and Y Magnus and A Gissis and Y Klebanov and Y Zohar}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0000911285&doi=10.1016%2f0044-8486%2895%2901178-1&partnerID=40&md5=5c8c94d7c52f9d763d1866eec84ca115}, doi = {10.1016/0044-8486(95)01178-1}, issn = {00448486}, year = {1996}, date = {1996-01-01}, journal = {Aquaculture}, volume = {140}, number = {3}, pages = {265--280}, abstract = {Hatchery-produced white bass (Morone chrysops) and striped bass (M. saxatilis) reared to maturity in a commercial aquaculture facility, were successfully spawned using controlled-release delivery systems containing the gonadotropin-releasing hormone analog DAla6, Pro9[NEt]-GnRH (GnRHa). Two-year-old white bass females (mean weight, 0.81 kg) were implanted with different polymer-based, GnRHa delivery systems at doses ranging from 40 to 89 μg GnRHa kg-1 body weight. GnRHa treatment on 20 February 1994, when females contained oocytes up to 720 μm in diameter, induced ovulation of all fish between 35 to 82 h after treatment. The white bass eggs produced were fertilized with sperm from striped bass for the production of sunshine bass. An average of 294500 eggs kg-1 were produced, with a mean fertility of 81.2%, 24 h survival of 46.5%, and overall hatching success of 45%. Survival from hatch to 30 days post-hatch was 78% and the fry weighed between 0.07 and 0.1 g. Overripening of eggs began within 1 h from ovulation and maximum fertilization (60%) was observed when eggs were stripped 0.5 h after ovulation. Fertilization success decreased thereafter to 31% and 10% by 1 h and 3 h after ovulation, respectively. Control fish not treated with GnRHa did not show any signs of final oocyte maturation during the period of the study. GnRHa administration via controlled-release delivery systems appears to be a very effective method for inducing high fecundity ovulation of captive white bass broodstocks, and producing eggs of high fertility and hatching success.}, note = {Publisher: Elsevier}, keywords = {}, pubstate = {published}, tppubtype = {article} } Hatchery-produced white bass (Morone chrysops) and striped bass (M. saxatilis) reared to maturity in a commercial aquaculture facility, were successfully spawned using controlled-release delivery systems containing the gonadotropin-releasing hormone analog DAla6, Pro9[NEt]-GnRH (GnRHa). Two-year-old white bass females (mean weight, 0.81 kg) were implanted with different polymer-based, GnRHa delivery systems at doses ranging from 40 to 89 μg GnRHa kg-1 body weight. GnRHa treatment on 20 February 1994, when females contained oocytes up to 720 μm in diameter, induced ovulation of all fish between 35 to 82 h after treatment. The white bass eggs produced were fertilized with sperm from striped bass for the production of sunshine bass. An average of 294500 eggs kg-1 were produced, with a mean fertility of 81.2%, 24 h survival of 46.5%, and overall hatching success of 45%. Survival from hatch to 30 days post-hatch was 78% and the fry weighed between 0.07 and 0.1 g. Overripening of eggs began within 1 h from ovulation and maximum fertilization (60%) was observed when eggs were stripped 0.5 h after ovulation. Fertilization success decreased thereafter to 31% and 10% by 1 h and 3 h after ovulation, respectively. Control fish not treated with GnRHa did not show any signs of final oocyte maturation during the period of the study. GnRHa administration via controlled-release delivery systems appears to be a very effective method for inducing high fecundity ovulation of captive white bass broodstocks, and producing eggs of high fertility and hatching success. |
Karakassis, Ioannis; Smith, C; Papadopoulou, K -N; Tsapakis, E; Xatziyanni, E; Maidanou, M; Frentzos, A; White, P; Kourakis, S; Katranidis, S Aquaculture & Environment: a research project of the 2nd Operational Program of Greece, General Secretariat of Research & Technology Journal Article Fisheries News, 178 , pp. 36–41, 1996. @article{karakassis_aquaculture_1996, title = {Aquaculture & Environment: a research project of the 2nd Operational Program of Greece, General Secretariat of Research & Technology}, author = {Ioannis Karakassis and C Smith and K -N Papadopoulou and E Tsapakis and E Xatziyanni and M Maidanou and A Frentzos and P White and S Kourakis and S Katranidis}, year = {1996}, date = {1996-01-01}, journal = {Fisheries News}, volume = {178}, pages = {36--41}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Boujard, T; Jourdan, M; Kentouri, M; Divanach, P Diel feeding activity and the effect of time-restricted self-feeding on growth and feed conversion in European sea bass Journal Article Aquaculture, 139 , pp. 117 – 127, 1996. @article{boujard_diel_1996, title = {Diel feeding activity and the effect of time-restricted self-feeding on growth and feed conversion in European sea bass}, author = {T Boujard and M Jourdan and M Kentouri and P Divanach}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0029667241&partnerID=40&md5=4f928f95721eadc7b9602a9134a4da65}, year = {1996}, date = {1996-01-01}, journal = {Aquaculture}, volume = {139}, pages = {117 -- 127}, abstract = {The feeding rhythm and growth performance of European sea bass Dicentrarchus labrax (initial weight 65 g ) were studied under free and time-restricted access to self-feeders. Under free access to the feeders, significant feeding rhythms with a nocturnal acrophase were observed, although there was considerable variability between replicates. When access to the self-feeders was restricted to two periods of 4 h day-1, the feed demand (FD) was reduced at the beginning of the experiment but not at the end, indicating that the period of adaptation, rather than appetite, was affected by such feeding practice. When access to the self-feeders was restricted to only one period of 4 h day-1, two thirds of the replicates eventually displayed FD similar to the fish having free access to feed, indicating that the restricted temporal access to feed could be compensated for. There was no detectable effect of feeding protocol on feed conversion or body composition, but growth was closely related to the total FD. Thus, growth was influenced by the fact that fish subjected to a time-restricted access to feed needed time to adapt to the new feeding situation. The results indicate that sea bass are capable of operating self-feeders, and can easily modify their feeding, resulting in both good growth performance and good feed conversion. © 1996 Elsevier Science B.V. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The feeding rhythm and growth performance of European sea bass Dicentrarchus labrax (initial weight 65 g ) were studied under free and time-restricted access to self-feeders. Under free access to the feeders, significant feeding rhythms with a nocturnal acrophase were observed, although there was considerable variability between replicates. When access to the self-feeders was restricted to two periods of 4 h day-1, the feed demand (FD) was reduced at the beginning of the experiment but not at the end, indicating that the period of adaptation, rather than appetite, was affected by such feeding practice. When access to the self-feeders was restricted to only one period of 4 h day-1, two thirds of the replicates eventually displayed FD similar to the fish having free access to feed, indicating that the restricted temporal access to feed could be compensated for. There was no detectable effect of feeding protocol on feed conversion or body composition, but growth was closely related to the total FD. Thus, growth was influenced by the fact that fish subjected to a time-restricted access to feed needed time to adapt to the new feeding situation. The results indicate that sea bass are capable of operating self-feeders, and can easily modify their feeding, resulting in both good growth performance and good feed conversion. © 1996 Elsevier Science B.V. All rights reserved. |
Machera, K; Cotou, E; Anastassiadou, P Fenbutatin acute toxicity on Artemia nauplii: Effects of sublethal concentrations on ATPase activity Journal Article Bulletin of Environmental Contamination and Toxicology, 56 (1), pp. 159–164, 1996, ISSN: 0007-4861, 1432-0800. @article{machera_fenbutatin_1996, title = {Fenbutatin acute toxicity on Artemia nauplii: Effects of sublethal concentrations on ATPase activity}, author = {K Machera and E Cotou and P Anastassiadou}, url = {http://link.springer.com/10.1007/s001289900023}, doi = {10.1007/s001289900023}, issn = {0007-4861, 1432-0800}, year = {1996}, date = {1996-01-01}, urldate = {2020-08-18}, journal = {Bulletin of Environmental Contamination and Toxicology}, volume = {56}, number = {1}, pages = {159--164}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Tsagkarakou, A; Navajas, M; Lagnel, J; Gutierrez, J; Pasteur, N Genetic variability in Tetranychus urticae (Acari: Tetranychidae) from Greece: Insecticide resistance and isozymes Journal Article Journal of Economic Entomology, 89 , pp. 1354 – 1358, 1996. @article{tsagkarakou_genetic_1996, title = {Genetic variability in Tetranychus urticae (Acari: Tetranychidae) from Greece: Insecticide resistance and isozymes}, author = {A Tsagkarakou and M Navajas and J Lagnel and J Gutierrez and N Pasteur}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030485243&partnerID=40&md5=5ca68d1453772b90fd6e7deb150f7fc2}, year = {1996}, date = {1996-01-01}, journal = {Journal of Economic Entomology}, volume = {89}, pages = {1354 -- 1358}, abstract = {Resistance to methyl-parathion methidathion, and methomyl was studied by bioassays in Tetranychus urticae Koch from Greece. At LC50, the resistance ratio was highly variable with methidathion (5- to 63-fold) and with methomyl (6- to 34-fold). The mortality curves with methyl-parathion showed a clear plateau at ≃20% mortality, and the resistance ratio was ≃50 fold at LC50 in all samples. By using isoelectric focusing on cellulose acetate membranes, electrophoretic studies of 5 loci encoding esterases (Est-1 and Est-2), glucose-phosphate isomerase (Gpi), malic enzyme (Me), and phosphoglucomutase (Pgm) disclosed large genetic differences among the samples.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Resistance to methyl-parathion methidathion, and methomyl was studied by bioassays in Tetranychus urticae Koch from Greece. At LC50, the resistance ratio was highly variable with methidathion (5- to 63-fold) and with methomyl (6- to 34-fold). The mortality curves with methyl-parathion showed a clear plateau at ≃20% mortality, and the resistance ratio was ≃50 fold at LC50 in all samples. By using isoelectric focusing on cellulose acetate membranes, electrophoretic studies of 5 loci encoding esterases (Est-1 and Est-2), glucose-phosphate isomerase (Gpi), malic enzyme (Me), and phosphoglucomutase (Pgm) disclosed large genetic differences among the samples. |
Koukouras, A; Russo, A; Voultsiadou-Koukoura, E; Arvanitidis, C; Stefanidou, D Macrofauna associated with sponge species of different morphology Journal Article Marine Ecology, 17 (4), pp. 569–582, 1996, ISSN: 01739565, (Publisher: Blackwell Verlag GmbH Berlin). @article{koukouras_macrofauna_1996, title = {Macrofauna associated with sponge species of different morphology}, author = {A Koukouras and A Russo and E Voultsiadou-Koukoura and C Arvanitidis and D Stefanidou}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030427632&doi=10.1111%2fj.1439-0485.1996.tb00418.x&partnerID=40&md5=ab85ea94afe5115359c48dad5fa7b5fb}, doi = {10.1111/j.1439-0485.1996.tb00418.x}, issn = {01739565}, year = {1996}, date = {1996-01-01}, journal = {Marine Ecology}, volume = {17}, number = {4}, pages = {569--582}, abstract = {The macrofaunas associated with the three morphologically different North Aegean Sea sponge species Agelas oroides, Aplysina aerophoba, and Axinella cannabina were compared. The faunal abundance was not related to sponge surface area for any of the three species. Each sponge species supported a significantly different number of individuals per unit canal volume; A. aerophoba supported the most, A. oroides the least. A. aerophoba supported the highest species richness, A. cannabina the lowest. Canal volume was a good predictor of associated faunal abundance and species richness for two of the three sponge species. Faunal abundance was also directly related to sponge mean canal diameter. The species composition of associated fauna was similar on A. aerophoba and A, oroides and significantly different on A. cannabina.}, note = {Publisher: Blackwell Verlag GmbH Berlin}, keywords = {}, pubstate = {published}, tppubtype = {article} } The macrofaunas associated with the three morphologically different North Aegean Sea sponge species Agelas oroides, Aplysina aerophoba, and Axinella cannabina were compared. The faunal abundance was not related to sponge surface area for any of the three species. Each sponge species supported a significantly different number of individuals per unit canal volume; A. aerophoba supported the most, A. oroides the least. A. aerophoba supported the highest species richness, A. cannabina the lowest. Canal volume was a good predictor of associated faunal abundance and species richness for two of the three sponge species. Faunal abundance was also directly related to sponge mean canal diameter. The species composition of associated fauna was similar on A. aerophoba and A, oroides and significantly different on A. cannabina. |
Navajas, M; Fournier, D; Lagnel, J; Gutlerrez, J; Boursot, P Mitochondrial COI sequences in mites: Evidence for variations in base composition Journal Article Insect Molecular Biology, 5 , pp. 281 – 285, 1996. @article{navajas_mitochondrial_1996, title = {Mitochondrial COI sequences in mites: Evidence for variations in base composition}, author = {M Navajas and D Fournier and J Lagnel and J Gutlerrez and P Boursot}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030293916&partnerID=40&md5=4f94d775771f686219da59d73f30bdc4}, year = {1996}, date = {1996-01-01}, journal = {Insect Molecular Biology}, volume = {5}, pages = {281 -- 285}, abstract = {Studies of mitochondrial DNA sequences in a variety of animals have shown important differences between phyla, including differences in the genetic codes used, and varying constraints on base composition. In that respect, little is known of mites, an important and diversified group. We sequenced a portion (340 nt) of the cytochrome oxidase subunit I (COI) encoding gene in twenty species of phytophagous mites belonging to nine genera of the two families Tetranychidae and Tenuipalpidae. The mitochondrial genetic code used in mites appeared to be the same as in insects. As is generally also the case in insects, the mite sequences were very rich in A + T (75% on average), especially at the third codon position (94%). However, important variations of base composition were observed among mite species, one of them showing as little as 69% A+T. Variations of base composition occur mostly through synonymous transitions, and do not have detectable effects on polypeptide evolution in this group.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Studies of mitochondrial DNA sequences in a variety of animals have shown important differences between phyla, including differences in the genetic codes used, and varying constraints on base composition. In that respect, little is known of mites, an important and diversified group. We sequenced a portion (340 nt) of the cytochrome oxidase subunit I (COI) encoding gene in twenty species of phytophagous mites belonging to nine genera of the two families Tetranychidae and Tenuipalpidae. The mitochondrial genetic code used in mites appeared to be the same as in insects. As is generally also the case in insects, the mite sequences were very rich in A + T (75% on average), especially at the third codon position (94%). However, important variations of base composition were observed among mite species, one of them showing as little as 69% A+T. Variations of base composition occur mostly through synonymous transitions, and do not have detectable effects on polypeptide evolution in this group. |
Navajas, M; Gutierrez, J; Lagnel, J; Boursot, P Bulletin of Entomological Research, 86 , pp. 407 – 417, 1996. @article{navajas_mitochondrial_1996-1, title = {Mitochondrial cytochrome oxidase I in tetranychid mites: A comparison between molecular phylogeny and changes of morphological and life history traits}, author = {M Navajas and J Gutierrez and J Lagnel and P Boursot}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000562466&partnerID=40&md5=b1b86a08dca24bd4ec61e645c29138b7}, year = {1996}, date = {1996-01-01}, journal = {Bulletin of Entomological Research}, volume = {86}, pages = {407 -- 417}, abstract = {Spider mites, Tetranychidae, represent one of the most cosmopolitan and economically important groups of terrestrial arthropods; however, many aspects of their evolutionary relationships remain uncertain. We sequenced part of the mitochondrial cytochrome oxidase subunit I (COI) gene in 20 species of phytophagous mites belonging to nine genera and two families (Tetranychidae and Tenuipalpidae), including several agricultural pests. As reported in insects, the sequences were extremely rich in A+T (75% on average), especially in the third codon position (95%). However, one of the genera we studied had a significantly lower A+T content (69% on average, 78% in the third codon position), showing that base composition can change substantially over short periods of time. Most interspecific differences were transversions and their number increased steadily with the number of non-synonymous differences, while the number of transitions remained constant. The phylogeny based on COI sequences was inferred using the maximum likelihood method. The results are compatible as a whole with the traditional classification based on morphological characters, but call for some minor taxonomic revisions. Some morphological characters and life history traits (mode of reproduction, adaptation to the host plant) were also analysed within this phylogenetic framework. At the family level, one can see a trend towards thelytoky becoming rarer compared to the general mode of reproduction of the group, arrhenotoky. There is also an evolutionary tendency towards a more complex mode of life, with the production of silk webs and correlated changes of the locomotion apparatus. However, in the Tetranychidae there seems to have been convergent evolution of these morphological characters together with independent development of a common adaptation to this mode of life in different genera.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Spider mites, Tetranychidae, represent one of the most cosmopolitan and economically important groups of terrestrial arthropods; however, many aspects of their evolutionary relationships remain uncertain. We sequenced part of the mitochondrial cytochrome oxidase subunit I (COI) gene in 20 species of phytophagous mites belonging to nine genera and two families (Tetranychidae and Tenuipalpidae), including several agricultural pests. As reported in insects, the sequences were extremely rich in A+T (75% on average), especially in the third codon position (95%). However, one of the genera we studied had a significantly lower A+T content (69% on average, 78% in the third codon position), showing that base composition can change substantially over short periods of time. Most interspecific differences were transversions and their number increased steadily with the number of non-synonymous differences, while the number of transitions remained constant. The phylogeny based on COI sequences was inferred using the maximum likelihood method. The results are compatible as a whole with the traditional classification based on morphological characters, but call for some minor taxonomic revisions. Some morphological characters and life history traits (mode of reproduction, adaptation to the host plant) were also analysed within this phylogenetic framework. At the family level, one can see a trend towards thelytoky becoming rarer compared to the general mode of reproduction of the group, arrhenotoky. There is also an evolutionary tendency towards a more complex mode of life, with the production of silk webs and correlated changes of the locomotion apparatus. However, in the Tetranychidae there seems to have been convergent evolution of these morphological characters together with independent development of a common adaptation to this mode of life in different genera. |
Magoulas, A; Tsimenides, N; Zouros, E Molecular Biology and Evolution, 13 (1), pp. 178–190, 1996, ISSN: 0737-4038, 1537-1719. @article{magoulas_mitochondrial_1996, title = {Mitochondrial DNA phylogeny and the reconstruction of the population history of a species: the case of the European anchovy (Engraulis encrasicolus)}, author = {A Magoulas and N Tsimenides and E Zouros}, url = {https://academic.oup.com/mbe/article-lookup/doi/10.1093/oxfordjournals.molbev.a025554}, doi = {10.1093/oxfordjournals.molbev.a025554}, issn = {0737-4038, 1537-1719}, year = {1996}, date = {1996-01-01}, urldate = {2020-08-09}, journal = {Molecular Biology and Evolution}, volume = {13}, number = {1}, pages = {178--190}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Kasapidis, P; Provatidou, S; Maragou, P; Valakos, E D Neue Daten über die Herpetofauna von Lesbos (ägäische Inseln, Griechenland) und einige biogeographische Bemerkungen über die Inseln des nordöstlichen ägäischen Archipels Journal Article Salamandra, 32 (3), pp. 171–180, 1996. @article{kasapidis_neue_1996, title = {Neue Daten über die Herpetofauna von Lesbos (ägäische Inseln, Griechenland) und einige biogeographische Bemerkungen über die Inseln des nordöstlichen ägäischen Archipels}, author = {P Kasapidis and S Provatidou and P Maragou and E D Valakos}, year = {1996}, date = {1996-01-01}, journal = {Salamandra}, volume = {32}, number = {3}, pages = {171--180}, abstract = {New data on the herpetofauna of Lesbos ( Aegean Islands, Greece) and some biogeographical remarks on the islands of the northern Aegean Archipelago. Fourteen species of reptiles were found on Lesbos lsland. The species Ablepharus kitaibelii and Mallolon monspessulanus are recorded for the first time from the island. The localities and some morphometric characters of the caught specimens are noted. Finally, we attempt to combine our data and the bibliographical ones in a biogeographical approach to the fauna of the islands of the northeastern Aegean Archipelago.}, keywords = {}, pubstate = {published}, tppubtype = {article} } New data on the herpetofauna of Lesbos ( Aegean Islands, Greece) and some biogeographical remarks on the islands of the northern Aegean Archipelago. Fourteen species of reptiles were found on Lesbos lsland. The species Ablepharus kitaibelii and Mallolon monspessulanus are recorded for the first time from the island. The localities and some morphometric characters of the caught specimens are noted. Finally, we attempt to combine our data and the bibliographical ones in a biogeographical approach to the fauna of the islands of the northeastern Aegean Archipelago. |
Nengas, I; Alexis, M N; Davies, S J Partial substitution of fishmeal with soybean meal products and derivatives in diets for the gilthead sea bream Sparus aurata (L.) Journal Article Aquaculture Research, 27 , pp. 147 – 156, 1996. @article{nengas_partial_1996, title = {Partial substitution of fishmeal with soybean meal products and derivatives in diets for the gilthead sea bream Sparus aurata (L.)}, author = {I Nengas and M N Alexis and S J Davies}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0001414634&partnerID=40&md5=3d8f337f2bc02e7328233a341eeacc51}, year = {1996}, date = {1996-01-01}, journal = {Aquaculture Research}, volume = {27}, pages = {147 -- 156}, abstract = {Two growth trials were conducted to evaluate the nutritional quality of several soybean products as constituents in diets for the gilthead sea bream. Sparus aurata (L). In a preliminary experiment, the fish were fed six diets containing different levels of solvent extracted soybean meal as a replacement for white fishmeal at four substitution levels: 10, 20, 30 and 40% of the fishmeal protein component. The diets supported less growth as the inclusion of soybean meal increased. However, significant reductions in growth were apparent at the 30% substitution level. All growth parameters followed the same trend. In the second experiment, six diets with 35% of the total protein contributed from differently processed soybean meals were tested. The products included three industrial full-fat meals heat processed for different periods, a solvent extracted meal and a soya protein concentrate. Protein digestibility coefficients were measured for all the experimental diets. All growth parameters of the fish fed the underheated full-fat meal, solvent extracted meal and soya concentrate were significantly lower than the control group. Protein digestibility coefficients were similar with no statistical differences (P textless 0.05).}, keywords = {}, pubstate = {published}, tppubtype = {article} } Two growth trials were conducted to evaluate the nutritional quality of several soybean products as constituents in diets for the gilthead sea bream. Sparus aurata (L). In a preliminary experiment, the fish were fed six diets containing different levels of solvent extracted soybean meal as a replacement for white fishmeal at four substitution levels: 10, 20, 30 and 40% of the fishmeal protein component. The diets supported less growth as the inclusion of soybean meal increased. However, significant reductions in growth were apparent at the 30% substitution level. All growth parameters followed the same trend. In the second experiment, six diets with 35% of the total protein contributed from differently processed soybean meals were tested. The products included three industrial full-fat meals heat processed for different periods, a solvent extracted meal and a soya protein concentrate. Protein digestibility coefficients were measured for all the experimental diets. All growth parameters of the fish fed the underheated full-fat meal, solvent extracted meal and soya concentrate were significantly lower than the control group. Protein digestibility coefficients were similar with no statistical differences (P textless 0.05). |
Tsigenopoulos, C S; Karakousis, Y Phylogenetic relationships of Leuciscus keadicus, an endemic cyprinid species from Greece, with other species of the genus Leuciscus Journal Article Folia Zoologica, 45 , pp. 87–93, 1996. @article{tsigenopoulos_phylogenetic_1996, title = {Phylogenetic relationships of Leuciscus keadicus, an endemic cyprinid species from Greece, with other species of the genus Leuciscus}, author = {C S Tsigenopoulos and Y Karakousis}, year = {1996}, date = {1996-01-01}, journal = {Folia Zoologica}, volume = {45}, pages = {87--93}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Wambeke, F V; Christaki, U; Psara, S; Bianchi, A M; Ignatiades, L; Tselepides, A; Dafnomili, E Phytoplankton-Bacteria Relationships in the Cretan Sea during March and September 1995 Inproceedings Iraklion, Crete, 1996, (Publication Title: 2nd Workshop of the Mediterranean Targeted project (MTP) Type: Poster). @inproceedings{wambeke_phytoplankton-bacteria_1996, title = {Phytoplankton-Bacteria Relationships in the Cretan Sea during March and September 1995}, author = {F V Wambeke and U Christaki and S Psara and A M Bianchi and L Ignatiades and A Tselepides and E Dafnomili}, year = {1996}, date = {1996-01-01}, address = {Iraklion, Crete}, note = {Publication Title: 2nd Workshop of the Mediterranean Targeted project (MTP) Type: Poster}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Holland, M C; Mylonas, C C; Zohar, Y Sperm characteristics of precocious 1-year-old male striped bass Morone saxatilis Journal Article Journal of the World Aquaculture Society, 27 (2), pp. 208–212, 1996, ISSN: 08938849. @article{holland_sperm_1996, title = {Sperm characteristics of precocious 1-year-old male striped bass Morone saxatilis}, author = {M C Holland and C C Mylonas and Y Zohar}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030542074&partnerID=40&md5=491dca9c066c1dfe3c2c338578e299b6}, issn = {08938849}, year = {1996}, date = {1996-01-01}, journal = {Journal of the World Aquaculture Society}, volume = {27}, number = {2}, pages = {208--212}, abstract = {Captive-reared, 10-mo-old, male striped bass Marone saxatilis were sampled monthly for testicular development between February and June 1994. One of the five males sampled in February showed precocious testicular development and had a gonadosomatic index (GSI) of 1.26%. while the other four fish had immature testes with a mean GSI ± Sx of 0.17 ± 0.03%. Spermiating individuals were present from April to June. In April the average body weight (BW) of spermiating males was 65 ± 4 g and their GSI reached a mean value of 4.75 ± 0.52%. In June, milt collected from ten precocious males contained motile spermatozoa with a mean of 31 ± 7% of the sperm showing forward movement. Mean milt volume and sperm concentration were 1.67 ± 0.41 mL/kg BW and 92.3 ± 1.8 x 109 spermatozoa/mL, respectively. These data show that male striped bass reared in captivity can reach sexual maturity during their first year. This is one year earlier than previously reported for striped bass in mid-Atlantic regions.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Captive-reared, 10-mo-old, male striped bass Marone saxatilis were sampled monthly for testicular development between February and June 1994. One of the five males sampled in February showed precocious testicular development and had a gonadosomatic index (GSI) of 1.26%. while the other four fish had immature testes with a mean GSI ± Sx of 0.17 ± 0.03%. Spermiating individuals were present from April to June. In April the average body weight (BW) of spermiating males was 65 ± 4 g and their GSI reached a mean value of 4.75 ± 0.52%. In June, milt collected from ten precocious males contained motile spermatozoa with a mean of 31 ± 7% of the sperm showing forward movement. Mean milt volume and sperm concentration were 1.67 ± 0.41 mL/kg BW and 92.3 ± 1.8 x 109 spermatozoa/mL, respectively. These data show that male striped bass reared in captivity can reach sexual maturity during their first year. This is one year earlier than previously reported for striped bass in mid-Atlantic regions. |
Sorbera, L A; Mylonas, C C; Zanuy, S; Carrillo, M; Zohar, Y Sustained administration of GnRHa increases milt volume without altering sperm counts in the sea bass Journal Article Journal of Experimental Zoology, 276 (5), pp. 361–368, 1996, ISSN: 0022104X. @article{sorbera_sustained_1996, title = {Sustained administration of GnRHa increases milt volume without altering sperm counts in the sea bass}, author = {L A Sorbera and C C Mylonas and S Zanuy and M Carrillo and Y Zohar}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030443470&doi=10.1002%2f%28SICI%291097-010X%2819961201%29276%3a5%3c361%3a%3aAID-JEZ6%3e3.0.CO%3b2-M&partnerID=40&md5=da145966d5c694db401ff311d820caab}, doi = {10.1002/(SICI)1097-010X(19961201)276:5<361::AID-JEZ6>3.0.CO;2-M}, issn = {0022104X}, year = {1996}, date = {1996-01-01}, journal = {Journal of Experimental Zoology}, volume = {276}, number = {5}, pages = {361--368}, abstract = {The role of gonadotropin-releasing hormone (GnRH) in spermiogenesis and spermiation is not well understood. This study examined the effects of different modes of administration of a GnRH analog (GnRHa; [D-Ala6, Pro9NEt]-mGnRH) on spermiation in the sea bass, Dicentrarchus labrax. Groups of sea bass received either GnRHa injection in saline (I; 25 μg/kg body weight [BW] or one of three types of GnRHa sustained release polymeric device: a fast-releasing implant (ethylene-vinyl acetate copolymer [EVAc]; 100 μg/kg BW), a slower-releasing implant (ethylene-vinyl acetate copolymer [EVSL]; 100 μg/kg BW), or biodegradable microspheres (M; 50 μg/kg BW). Total expressible milt was collected and assessed for volume, motility, and counts at various intervals for 44 days. Untreated males produced a total of 9.4 ± 3.4 ml/kg BW (mean ± SEM) of milt over the 44-day experimental period, with milt production ending by day 28. All GnRHa treatments stimulated a significant increase in total milt volume (ml/kg BW) peaking by day 2 (I: 11.8 ± 1.8) or day 7 (EVAc: 20.0 ± 1.5; M: 26.8 ± 2.7; EVSL: 27.9 ± 4.3) posttreatment. While milt volumes in injected males returned to control values by day 14, all groups treated with sustained GnRHa delivery systems maintained significantly elevated milt volumes for 21 days (EVAc group) or 35 days (EVSL and M groups). Sperm motility was consistently good to excellent (70-100% vigorously active) in all groups when expressible milt volume was above 1.0 ml, and there were no significant differences in sperm counts (averaging 5.5 ± 0.1 x 109 spermatozoa/ml). These data show that sustained administration of GnRHa significantly increases and prolongs spermiation in the sea bass without altering sperm concentration or quality.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The role of gonadotropin-releasing hormone (GnRH) in spermiogenesis and spermiation is not well understood. This study examined the effects of different modes of administration of a GnRH analog (GnRHa; [D-Ala6, Pro9NEt]-mGnRH) on spermiation in the sea bass, Dicentrarchus labrax. Groups of sea bass received either GnRHa injection in saline (I; 25 μg/kg body weight [BW] or one of three types of GnRHa sustained release polymeric device: a fast-releasing implant (ethylene-vinyl acetate copolymer [EVAc]; 100 μg/kg BW), a slower-releasing implant (ethylene-vinyl acetate copolymer [EVSL]; 100 μg/kg BW), or biodegradable microspheres (M; 50 μg/kg BW). Total expressible milt was collected and assessed for volume, motility, and counts at various intervals for 44 days. Untreated males produced a total of 9.4 ± 3.4 ml/kg BW (mean ± SEM) of milt over the 44-day experimental period, with milt production ending by day 28. All GnRHa treatments stimulated a significant increase in total milt volume (ml/kg BW) peaking by day 2 (I: 11.8 ± 1.8) or day 7 (EVAc: 20.0 ± 1.5; M: 26.8 ± 2.7; EVSL: 27.9 ± 4.3) posttreatment. While milt volumes in injected males returned to control values by day 14, all groups treated with sustained GnRHa delivery systems maintained significantly elevated milt volumes for 21 days (EVAc group) or 35 days (EVSL and M groups). Sperm motility was consistently good to excellent (70-100% vigorously active) in all groups when expressible milt volume was above 1.0 ml, and there were no significant differences in sperm counts (averaging 5.5 ± 0.1 x 109 spermatozoa/ml). These data show that sustained administration of GnRHa significantly increases and prolongs spermiation in the sea bass without altering sperm concentration or quality. |
Chatzifotis, S; Takeuchi, T; Seikai, T The effect of dietary carnitine supplementation on growth of red sea bream (Pagarus major) fingerlings at two levels of dietary lysine Journal Article Aquaculture, 147 (3-4), pp. 235–248, 1996, ISSN: 00448486. @article{chatzifotis_effect_1996, title = {The effect of dietary carnitine supplementation on growth of red sea bream (Pagarus major) fingerlings at two levels of dietary lysine}, author = {S Chatzifotis and T Takeuchi and T Seikai}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030454803&doi=10.1016%2fS0044-8486%2896%2901403-2&partnerID=40&md5=0749d0b12ee23953ba9e2ae0e5221b48}, doi = {10.1016/S0044-8486(96)01403-2}, issn = {00448486}, year = {1996}, date = {1996-01-01}, journal = {Aquaculture}, volume = {147}, number = {3-4}, pages = {235--248}, abstract = {The effect of dietary carnitine supplementation (2 g kg-1 diet) on growth, proximate, neutral lipid and fatty acid composition of liver and muscle of red sea bream fingerlings at two levels of dietary lysine (10 and 14 g kg-1 diet, respectively) was investigated. Carnitine increased red sea bream growth fed a 14 g lysine kg-1 diet (P < 0.05) but did not cause any effect on growth in fish fed the 10 g lysine kg-1) diet. A clear lysine sparing effect of carnitine in red sea bream was not observed. Carnitine did not reduce crude lipid levels in white muscle and liver of fish. Fatty acid composition of total lipids in liver showed reduced values for eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and total long-chain fatty acids with 20 to 24 carbon atoms (ΣC20-24) in fish receiving carnitine supplemented diets indicating an increased utilization of the above fatty acids. Free carnitine and acid-soluble carnitine in muscle increased two fold after carnitine administration.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The effect of dietary carnitine supplementation (2 g kg-1 diet) on growth, proximate, neutral lipid and fatty acid composition of liver and muscle of red sea bream fingerlings at two levels of dietary lysine (10 and 14 g kg-1 diet, respectively) was investigated. Carnitine increased red sea bream growth fed a 14 g lysine kg-1 diet (P < 0.05) but did not cause any effect on growth in fish fed the 10 g lysine kg-1) diet. A clear lysine sparing effect of carnitine in red sea bream was not observed. Carnitine did not reduce crude lipid levels in white muscle and liver of fish. Fatty acid composition of total lipids in liver showed reduced values for eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and total long-chain fatty acids with 20 to 24 carbon atoms (ΣC20-24) in fish receiving carnitine supplemented diets indicating an increased utilization of the above fatty acids. Free carnitine and acid-soluble carnitine in muscle increased two fold after carnitine administration. |
Zouros, E; Thiriot-Quievreux, C; Kotoulas, G Genetical Research, 68 (2), pp. 109–116, 1996, ISSN: 00166723. @article{zouros_negative_1996, title = {The negative correlation between somatic aneuploidy and growth in the oyster Crassostrea gigas and implications for the effects of induced polyploidization}, author = {E Zouros and C Thiriot-Quievreux and G Kotoulas}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0029827355&partnerID=40&md5=521daa399a6f0c6e7a91a097fde9d06d}, issn = {00166723}, year = {1996}, date = {1996-01-01}, journal = {Genetical Research}, volume = {68}, number = {2}, pages = {109--116}, abstract = {This study extends previous observations that chromosome loss in somatic cells of juveniles of the pacific oyster Crassostrea gigas is associated with reduced growth rate. All four studies designed to examine this association (two using random population samples and two using full sibs) produced the same result. This consistent effect appears to be unrelated with the commonly, but not consistently, observed correlation between degree of allozyme heterozygosity and growth. We propose that the inverse relationship between aneuploidy and growth is due to the unmasking of deleterious recessive genes caused by 'progressive haploidization' of somatic cells. Because unmasking of deleterious recessive genes by random chromosome loss is unlikely in polyploid cells, this hypothesis may also provide an explanation for the observation that artificially produced polyploid shellfish usually grow at faster rates than normal diploid ones.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This study extends previous observations that chromosome loss in somatic cells of juveniles of the pacific oyster Crassostrea gigas is associated with reduced growth rate. All four studies designed to examine this association (two using random population samples and two using full sibs) produced the same result. This consistent effect appears to be unrelated with the commonly, but not consistently, observed correlation between degree of allozyme heterozygosity and growth. We propose that the inverse relationship between aneuploidy and growth is due to the unmasking of deleterious recessive genes caused by 'progressive haploidization' of somatic cells. Because unmasking of deleterious recessive genes by random chromosome loss is unlikely in polyploid cells, this hypothesis may also provide an explanation for the observation that artificially produced polyploid shellfish usually grow at faster rates than normal diploid ones. |
Dounas, C; Koutsoubas, Drosos; Arvanitidis, Christos; Petihakis, George; Drummond, A; Eleftheriou, A Βiodiversity in the Μediterranean lagoons: Τhe case of Gialova lagoon, SW Greece Inproceedings Frankfurt a.M., Germany, 1996, (Publication Title: Second Ιnternational Βiodiversity Conference, Frankfurt a.M., Germany). @inproceedings{dounas_iodiversity_1996, title = {Βiodiversity in the Μediterranean lagoons: Τhe case of Gialova lagoon, SW Greece}, author = {C Dounas and Drosos Koutsoubas and Christos Arvanitidis and George Petihakis and A Drummond and A Eleftheriou}, year = {1996}, date = {1996-01-01}, address = {Frankfurt a.M., Germany}, note = {Publication Title: Second Ιnternational Βiodiversity Conference, Frankfurt a.M., Germany}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
1995 |
Salvanes, AGV; Bergstad, OA; Gordon, JDM; Kristoffersen, JB; Lewis, JL; Stockley, BM; Torkhildsen, S; Ullebust, H Ecological investigations of the mesopelagic and deep-water , demersal fishes at the continental margin of the southeastern Norwegian Sea and of the mesopelagic fishes in Herdlefjorden and Storfjorden Technical Report Department of Fisheries and Marine Biology, University of Bergen Bergen, Norway, 1995, (Place: Bergen Publisher: Department of Fisheries and Marine Biology, University of Bergen). @techreport{salvanes_ecological_1995, title = {Ecological investigations of the mesopelagic and deep-water , demersal fishes at the continental margin of the southeastern Norwegian Sea and of the mesopelagic fishes in Herdlefjorden and Storfjorden}, author = {AGV Salvanes and OA Bergstad and JDM Gordon and JB Kristoffersen and JL Lewis and BM Stockley and S Torkhildsen and H Ullebust}, year = {1995}, date = {1995-10-01}, pages = {1--14}, address = {Bergen, Norway}, institution = {Department of Fisheries and Marine Biology, University of Bergen}, note = {Place: Bergen Publisher: Department of Fisheries and Marine Biology, University of Bergen}, keywords = {}, pubstate = {published}, tppubtype = {techreport} } |
Dando, P R; Hughes, J A; Leahy, Y; Taylor, L J; Zivanovic, S Earthquakes increase hydrothermal venting and nutrient inputs into the Aegean Journal Article Continental Shelf Research, 15 (6), pp. 655–662, 1995, ISSN: 02784343. @article{dando_earthquakes_1995, title = {Earthquakes increase hydrothermal venting and nutrient inputs into the Aegean}, author = {P R Dando and J A Hughes and Y Leahy and L J Taylor and S Zivanovic}, url = {https://linkinghub.elsevier.com/retrieve/pii/0278434394E0031G}, doi = {10.1016/0278-4343(94)E0031-G}, issn = {02784343}, year = {1995}, date = {1995-05-01}, urldate = {2020-08-17}, journal = {Continental Shelf Research}, volume = {15}, number = {6}, pages = {655--662}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Nengas, I; Alexis, M N; Davies, S J; Petichakis, G Investigation to determine digestibility coefficients of various raw materials in diets for gilthead sea bream, Sparus auratus L. Journal Article Aquaculture Research, 26 (3), pp. 185–194, 1995, ISSN: 1355-557X, 1365-2109. @article{nengas_investigation_1995, title = {Investigation to determine digestibility coefficients of various raw materials in diets for gilthead sea bream, Sparus auratus L.}, author = {I Nengas and M N Alexis and S J Davies and G Petichakis}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0029132532&partnerID=40&md5=9689c28ef976e73848ed195bdd701739}, doi = {10.1111/j.1365-2109.1995.tb00901.x}, issn = {1355-557X, 1365-2109}, year = {1995}, date = {1995-03-01}, journal = {Aquaculture Research}, volume = {26}, number = {3}, pages = {185--194}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Arvanitidis, C; Koukouras, A Ophelia, 40 (3), pp. 219–227, 1995, ISSN: 00785326. @article{arvanitidis_amphitritides_1995, title = {Amphitritides kuehlmanni sp. nov. (Polychaeta, terebellidae, amphitritinae) From the aegean sea, with comments on the genus amphitritides augener}, author = {C Arvanitidis and A Koukouras}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0008052656&doi=10.1080%2f00785326.1995.10430587&partnerID=40&md5=1d9f4ac3229430ce5afd424dee8fc704}, doi = {10.1080/00785326.1995.10430587}, issn = {00785326}, year = {1995}, date = {1995-01-01}, journal = {Ophelia}, volume = {40}, number = {3}, pages = {219--227}, abstract = {A new species of Terebellidae Polychaeta, Amphitritides kuehlmanni, is described from shallow waters in the North Aegean. The new species is compared to the other known species of the genus. The status of the genus Amphitritides Augener is discussed. © 1995, Taylor & Francis Group. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A new species of Terebellidae Polychaeta, Amphitritides kuehlmanni, is described from shallow waters in the North Aegean. The new species is compared to the other known species of the genus. The status of the genus Amphitritides Augener is discussed. © 1995, Taylor & Francis Group. All rights reserved. |
Kotoulas, G; Bonhomme, F; Borsa, P Genetic structure of the common sole Solea vulgaris at different geographic scales Journal Article Marine Biology, 122 (3), pp. 361–375, 1995, ISSN: 00253162, (Publisher: Springer-Verlag). @article{kotoulas_genetic_1995, title = {Genetic structure of the common sole Solea vulgaris at different geographic scales}, author = {G Kotoulas and F Bonhomme and P Borsa}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0029414659&doi=10.1007%2fBF00350869&partnerID=40&md5=efae5e82aeadebd78b94d317e2406129}, doi = {10.1007/BF00350869}, issn = {00253162}, year = {1995}, date = {1995-01-01}, journal = {Marine Biology}, volume = {122}, number = {3}, pages = {361--375}, abstract = {The genetic structure of the flatfish Solea vulgaris was investigated on several spatial scales and at the temporal level through analysis of electrophoretic variation at 8 to 12 polymorphic enzyme loci. No differentiation was apparent at the temporal scale. Some differentiation was detected at and above the regional scale. Isolation by distance was evidenced by the significant correlation between genetic and geographic distances, and by the consistency of the results of multiple-locus correspondence analysis with geographic sampling patterns. The analysis suggested that the geographic unit of population structure (i.e. a geographical area corresponding to a panmictic or nearly panmictic population) lies within a radius of the order of 100 km. The isolation-by-distance pattern in S. vulgaris contrasted with the known genetic structures of other flatfish species of the northeastern Atlantic and Mediterranean in a way that may be related to the range of their respective temperature tolerances for eggs and larvae. © 1995 Springer-Verlag.}, note = {Publisher: Springer-Verlag}, keywords = {}, pubstate = {published}, tppubtype = {article} } The genetic structure of the flatfish Solea vulgaris was investigated on several spatial scales and at the temporal level through analysis of electrophoretic variation at 8 to 12 polymorphic enzyme loci. No differentiation was apparent at the temporal scale. Some differentiation was detected at and above the regional scale. Isolation by distance was evidenced by the significant correlation between genetic and geographic distances, and by the consistency of the results of multiple-locus correspondence analysis with geographic sampling patterns. The analysis suggested that the geographic unit of population structure (i.e. a geographical area corresponding to a panmictic or nearly panmictic population) lies within a radius of the order of 100 km. The isolation-by-distance pattern in S. vulgaris contrasted with the known genetic structures of other flatfish species of the northeastern Atlantic and Mediterranean in a way that may be related to the range of their respective temperature tolerances for eggs and larvae. © 1995 Springer-Verlag. |
Publications
1997 |
Cyto-histological examination of post-vitellogenesis and final oocyte maturation in captive-reared striped bass Journal Article Journal of Fish Biology, 50 (1), pp. 34–49, 1997, ISSN: 00221112. |
Diel pattern of haematocrit, serum metabolites, osmotic pressure, electrolytes and thyroid hormones in sea bass and sea bream Journal Article Aquaculture International, 5 , pp. 237 – 247, 1997. |
Distribution of nutrients, chloroplastic pigments, POC, PON and ATP in the Cretan Sea (NE Mediterranean): Seasonal and interannual variability Inproceedings pp. 189–193, 1997, (Publication Title: The 5th Pan-Hellenic Symposium of Oceanography and Fisheries). |
Dynamics of the physicochemical parameters in water column and in the sediments of the Gialova lagoon (NW Peloponnese, Ionian Sea) Inproceedings pp. 351–353, Kavala, Greece, 1997, (Publication Title: Seventh Symposium on Oceanography and Fisheries, Κavala). |
Aquaculture, 158 (1-2), pp. 129–140, 1997, ISSN: 00448486. |
Aquaculture, 156 , pp. 145 – 155, 1997. |
Effects of aquaculture in three coastal areas Journal Article Fisheries News, 199 , pp. 90–95, 1997. |
Canadian Journal of Fisheries and Aquatic Sciences, 54 (9), pp. 1957–1964, 1997, ISSN: 0706652X. |
Has time come for the genetic management of sea bass? Journal Article Aquaculture Europe, 22 (2), pp. 46–47, 1997. |
Aquaculture, 153 (3-4), pp. 301–311, 1997, ISSN: 00448486. |
Infraspecific zoogeography of the Mediterranean: population genetic analysis on sixteen Atlanto-Mediterranean species (fishes and invertebrates) Journal Article Vie et Milieu, 47 , pp. 295 – 305, 1997. |
Vie et Milieu, 47 (4), pp. 295–305, 1997, ISSN: 02408759. |
Interaction of Aquaculture and the Marine Environment. Methodology and preliminary results Journal Article Fisheries News, 192 , pp. 40–45, 1997. |
Macrobenthic community structure in Cretan Sea. Inproceedings pp. 233–236, Kavala, Greece, 1997, (Publication Title: the 5th National Symposium on Oceanography and Fisheries). |
Modulation of testicular androgen production in adolescent African catfish (Clarias gariepinus) Journal Article General and Comparative Endocrinology, 108 (1), pp. 56–66, 1997, ISSN: 00166480, (Publisher: Academic Press Inc.). |
Pathological findings owing to the lack of ascorbic acid in cultured gilthead bream (Sparus aurata L.) Journal Article Aquaculture, 151 , pp. 209 – 218, 1997. |
Planktonic food web in marine mesocosms in the Eastern Mediterranean: Bottom-up or top-down regulation? Journal Article Hydrobiologia, 363 , pp. 97 – 105, 1997. |
General and Comparative Endocrinology, 108 (2), pp. 223–236, 1997, ISSN: 00166480, (Publisher: Academic Press Inc.). |
Population structure in the spider mite Tetranychus urticae (Acari: Tetranychidae) from Crete based on multiple allozymes Journal Article Heredity, 78 (1), pp. 84–92, 1997, ISSN: 0018-067X, 1365-2540. |
Primary production estimates in the oligotrophic Cretan sea Inproceedings pp. 225–229, 1997, (Publication Title: 5th Pan-Hellenic Symposium of Oceanography and Fisheries). |
Reproductive biology and endocrine regulation of final oocyte maturation of captive white bass Journal Article Journal of Fish Biology, 51 (2), pp. 234–250, 1997, ISSN: 00221112. |
Structure and dynamics of the macrobenthic populations in Gialova lagoon (Ionian Sea) Inproceedings 1997, (Publication Title: Seventh Symposium on Oceanography and Fisheries, Κavala). |
The Effect of Dietary Carnitine Supplementation on Growth of Rainbow Trout Fingerlings Journal Article Fisheries Science, 63 (2), pp. 321–322, 1997, ISSN: 09199268, (Publisher: Blackwell Publishing). |
The genus Paradiopatra (Polychaeta, Onuphidae) in the Mediterranean with the description of Paradiopatra calliopae sp. nov. Journal Article Ophelia, 46 (1), pp. 51–63, 1997, ISSN: 00785326. |
The structure of macrobenthic communities in three coastal areas of intensive fish-culture. Inproceedings pp. 223–226, Kavala, Greece,, 1997, (Publication Title: The 5th Pan-Hellenic Symposium of Oceanography and Fisheries). |
1996 |
A comparative analysis of the growth history of Maurolicus muelleri in the Norwegian Sea and west Norwegian fjords Inproceedings Kristoffersen, JB (Ed.): International symposium on the role of forage fishes in marine ecosystems, Anchorage November 13-16, 1996, 1996. |
The mesopelagic and demersal fishes of the northeastern Norwegian Sea and mid- and west Norwegian fjords Technical Report Department of Fisheries and Marine Biology, University of Bergen Bergen, Norway, (21), 1996, (Place: Bergen Publisher: Department of Fisheries and Marine Biology, University of Bergen). |
Aquaculture, 140 (3), pp. 265–280, 1996, ISSN: 00448486, (Publisher: Elsevier). |
Aquaculture & Environment: a research project of the 2nd Operational Program of Greece, General Secretariat of Research & Technology Journal Article Fisheries News, 178 , pp. 36–41, 1996. |
Diel feeding activity and the effect of time-restricted self-feeding on growth and feed conversion in European sea bass Journal Article Aquaculture, 139 , pp. 117 – 127, 1996. |
Fenbutatin acute toxicity on Artemia nauplii: Effects of sublethal concentrations on ATPase activity Journal Article Bulletin of Environmental Contamination and Toxicology, 56 (1), pp. 159–164, 1996, ISSN: 0007-4861, 1432-0800. |
Genetic variability in Tetranychus urticae (Acari: Tetranychidae) from Greece: Insecticide resistance and isozymes Journal Article Journal of Economic Entomology, 89 , pp. 1354 – 1358, 1996. |
Macrofauna associated with sponge species of different morphology Journal Article Marine Ecology, 17 (4), pp. 569–582, 1996, ISSN: 01739565, (Publisher: Blackwell Verlag GmbH Berlin). |
Mitochondrial COI sequences in mites: Evidence for variations in base composition Journal Article Insect Molecular Biology, 5 , pp. 281 – 285, 1996. |
Bulletin of Entomological Research, 86 , pp. 407 – 417, 1996. |
Molecular Biology and Evolution, 13 (1), pp. 178–190, 1996, ISSN: 0737-4038, 1537-1719. |
Neue Daten über die Herpetofauna von Lesbos (ägäische Inseln, Griechenland) und einige biogeographische Bemerkungen über die Inseln des nordöstlichen ägäischen Archipels Journal Article Salamandra, 32 (3), pp. 171–180, 1996. |
Partial substitution of fishmeal with soybean meal products and derivatives in diets for the gilthead sea bream Sparus aurata (L.) Journal Article Aquaculture Research, 27 , pp. 147 – 156, 1996. |
Phylogenetic relationships of Leuciscus keadicus, an endemic cyprinid species from Greece, with other species of the genus Leuciscus Journal Article Folia Zoologica, 45 , pp. 87–93, 1996. |
Phytoplankton-Bacteria Relationships in the Cretan Sea during March and September 1995 Inproceedings Iraklion, Crete, 1996, (Publication Title: 2nd Workshop of the Mediterranean Targeted project (MTP) Type: Poster). |
Sperm characteristics of precocious 1-year-old male striped bass Morone saxatilis Journal Article Journal of the World Aquaculture Society, 27 (2), pp. 208–212, 1996, ISSN: 08938849. |
Sustained administration of GnRHa increases milt volume without altering sperm counts in the sea bass Journal Article Journal of Experimental Zoology, 276 (5), pp. 361–368, 1996, ISSN: 0022104X. |
The effect of dietary carnitine supplementation on growth of red sea bream (Pagarus major) fingerlings at two levels of dietary lysine Journal Article Aquaculture, 147 (3-4), pp. 235–248, 1996, ISSN: 00448486. |
Genetical Research, 68 (2), pp. 109–116, 1996, ISSN: 00166723. |
Βiodiversity in the Μediterranean lagoons: Τhe case of Gialova lagoon, SW Greece Inproceedings Frankfurt a.M., Germany, 1996, (Publication Title: Second Ιnternational Βiodiversity Conference, Frankfurt a.M., Germany). |
1995 |
Ecological investigations of the mesopelagic and deep-water , demersal fishes at the continental margin of the southeastern Norwegian Sea and of the mesopelagic fishes in Herdlefjorden and Storfjorden Technical Report Department of Fisheries and Marine Biology, University of Bergen Bergen, Norway, 1995, (Place: Bergen Publisher: Department of Fisheries and Marine Biology, University of Bergen). |
Earthquakes increase hydrothermal venting and nutrient inputs into the Aegean Journal Article Continental Shelf Research, 15 (6), pp. 655–662, 1995, ISSN: 02784343. |
Investigation to determine digestibility coefficients of various raw materials in diets for gilthead sea bream, Sparus auratus L. Journal Article Aquaculture Research, 26 (3), pp. 185–194, 1995, ISSN: 1355-557X, 1365-2109. |
Ophelia, 40 (3), pp. 219–227, 1995, ISSN: 00785326. |
Genetic structure of the common sole Solea vulgaris at different geographic scales Journal Article Marine Biology, 122 (3), pp. 361–375, 1995, ISSN: 00253162, (Publisher: Springer-Verlag). |