Basil ' 94 / Marc Legendre

Public ISBD Faire une suggestion d'achat Titre : Basil ' 94 : résumés Type de document : texte imprimé Auteurs : Marc Legendre, Auteur Editeur : Cemagref Année de publication : 1994 Importance : 194 p. Format : 24 cm ISBN/ISSN/EAN : 978-2-85362-365-0 Langues : Anglais (eng) Index. décimale : 639 Chasse et pêche commerciales, protection de la faune et la flore Résumé : Le présent ouvrage présente le résumé des interventions communiquées aux sessions de l'atelier organisé à l'initiative du GAMET (groupe aquaculture continentale Méditerranéenne et Tropicale), du 24 au 27 Mai 1944 à Montpellier, qui a porté sur les bases biologiques de l'aquaculture des siluriformes. Les articles sont classés par session et dans chaque session par ordre alphabétique sur le nom du premier auteur. Les sessions abordées lors de cet atelier sont présentées comme suit : " session diversité biologique; " session reproduction; " session génétique; " session nutrition, alimentation et croissance; " session physiologie et adaptation; " session pathologie et parasitisme; " session transformation et qualité des produits; " session synthèse mondiale sur l'élevage des siluriformes; " session systems de production. Basil ' 94 : résumés [texte imprimé] / Marc Legendre, Auteur . - Cemagref, 1994 . - 194 p. ; 24 cm. ISBN : 978-2-85362-365-0 Langues : Anglais (eng) Index. décimale : 639 Chasse et pêche commerciales, protection de la faune et la flore Résumé : Le présent ouvrage présente le résumé des interventions communiquées aux sessions de l'atelier organisé à l'initiative du GAMET (groupe aquaculture continentale Méditerranéenne et Tropicale), du 24 au 27 Mai 1944 à Montpellier, qui a porté sur les bases biologiques de l'aquaculture des siluriformes. Les articles sont classés par session et dans chaque session par ordre alphabétique sur le nom du premier auteur. Les sessions abordées lors de cet atelier sont présentées comme suit : " session diversité biologique; " session reproduction; " session génétique; " session nutrition, alimentation et croissance; " session physiologie et adaptation; " session pathologie et parasitisme; " session transformation et qualité des produits; " session synthèse mondiale sur l'élevage des siluriformes; " session systems de production.

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Evidence of environemental effects on reproductive characteristics of nile tilapia (Oreochromis niloticus) populations from man-made lakes of Ivory coast / Marc Legendre

Public ISBD Faire une suggestion d'achat Titre : Evidence of environemental effects on reproductive characteristics of nile tilapia (Oreochromis niloticus) populations from man-made lakes of Ivory coast Type de document : texte imprimé Auteurs : Marc Legendre, Auteur Importance : pp. 137-144 Langues : Anglais (eng) Index. décimale : 578 Histoire naturelle des organismes vivants Résumé : Large differences in reproductive traits were observed between populations of Oreochromis niloticus sampled in 9 manmade lakes of Ivory Coast. In order to assess whether these variations in reproductive characteristics resulted from short term adaptation or from a longer evolution31y process, living specimens were caught in the two most differentiated populations in term of life history traits, and placed in a common environment in culture conditions. Genetic analysis of fish from these two populations were performed using four microsatellite markers and revealed that both descended originally from the same strain (Bouake station) which was constituted from broodfish initially caught in the Nile and Volta basins. Fish from the two populations were subjected to a common environment (pond and aquariums) for five months. Then, their reproductive ch31'acteristics were analysed and no significant differences were found in fecundity, egg size and spawning frequency. These results indicate that reproductive differences between the two populations, originally observed in the two reservoirs, mostly reflect the phenotypic plasticity of the species in facing different environmental conditions. Evidence of environemental effects on reproductive characteristics of nile tilapia (Oreochromis niloticus) populations from man-made lakes of Ivory coast [texte imprimé] / Marc Legendre, Auteur . - [s.d.] . - pp. 137-144. Langues : Anglais (eng) Index. décimale : 578 Histoire naturelle des organismes vivants Résumé : Large differences in reproductive traits were observed between populations of Oreochromis niloticus sampled in 9 manmade lakes of Ivory Coast. In order to assess whether these variations in reproductive characteristics resulted from short term adaptation or from a longer evolution31y process, living specimens were caught in the two most differentiated populations in term of life history traits, and placed in a common environment in culture conditions. Genetic analysis of fish from these two populations were performed using four microsatellite markers and revealed that both descended originally from the same strain (Bouake station) which was constituted from broodfish initially caught in the Nile and Volta basins. Fish from the two populations were subjected to a common environment (pond and aquariums) for five months. Then, their reproductive ch31'acteristics were analysed and no significant differences were found in fecundity, egg size and spawning frequency. These results indicate that reproductive differences between the two populations, originally observed in the two reservoirs, mostly reflect the phenotypic plasticity of the species in facing different environmental conditions.

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Larval rearing of an Asian catfish pangasius hypophthalmus (Siluroidei, Pangasiidae) / Marc Legendre

Public ISBD Faire une suggestion d'achat Titre : Larval rearing of an Asian catfish pangasius hypophthalmus (Siluroidei, Pangasiidae) : analysis of precocious mortality and proposition of appropriate treatments Type de document : texte imprimé Auteurs : Marc Legendre, Auteur Importance : pp. 37-44 Langues : Anglais (eng) Index. décimale : 578 Histoire naturelle des organismes vivants Résumé : Both in Indonesia and Vietnam, larval rearing of Pangasius hypophthalmus remains problematic due to the variable and generally low survival rates obtained. The first week represents the most critical period for these larvae and up to now, cannibalistic behaviour was considered as the main cause of mortality. In the present study, two experiments were carried out in order to better understand the evolution and causes of mortality of P. hypophthalmus larvae from hatching up to 8 d of age and to find measures to improve survival rates. The first experiment was designed to evaluate the importance of cannibalism and differences in mortality when larvae from two different females were reared either in groups of 30 individuals or in isolated condition (30 larvae reared separately). In both cases, the culture was carried out either with or without antibiotic. The aim of the second experiment was to test oxytetracycline and different disinfectants (chloramine-T, formalin and 'formalin + malachite green oxalate') at different dosages in order to prevent bacterial outbreaks in the culture. The results indicated that the survival rates of P. hypophthalmus larvae was dependent on the initial quality of larvae or eggs and that larval mortality was more a consequence of pathogenic infection than a direct effect of cannibalism. The present study demonstrated that the survival rates of larvae were systematically improved when rearing was carried out in water containing antibiotic (oxytetracycline at a dose of 5 to 20 mg-L~'). Survival rate and final mean body weight of larvae as high as those obtained using antibiotic were also reached with applications of disinfectants such as chloramine-T and formalin. The use of these disinfectants is recommended for commercial P. hypophthalmus hatcheries. Larval rearing of an Asian catfish pangasius hypophthalmus (Siluroidei, Pangasiidae) : analysis of precocious mortality and proposition of appropriate treatments [texte imprimé] / Marc Legendre, Auteur . - [s.d.] . - pp. 37-44. Langues : Anglais (eng) Index. décimale : 578 Histoire naturelle des organismes vivants Résumé : Both in Indonesia and Vietnam, larval rearing of Pangasius hypophthalmus remains problematic due to the variable and generally low survival rates obtained. The first week represents the most critical period for these larvae and up to now, cannibalistic behaviour was considered as the main cause of mortality. In the present study, two experiments were carried out in order to better understand the evolution and causes of mortality of P. hypophthalmus larvae from hatching up to 8 d of age and to find measures to improve survival rates. The first experiment was designed to evaluate the importance of cannibalism and differences in mortality when larvae from two different females were reared either in groups of 30 individuals or in isolated condition (30 larvae reared separately). In both cases, the culture was carried out either with or without antibiotic. The aim of the second experiment was to test oxytetracycline and different disinfectants (chloramine-T, formalin and 'formalin + malachite green oxalate') at different dosages in order to prevent bacterial outbreaks in the culture. The results indicated that the survival rates of P. hypophthalmus larvae was dependent on the initial quality of larvae or eggs and that larval mortality was more a consequence of pathogenic infection than a direct effect of cannibalism. The present study demonstrated that the survival rates of larvae were systematically improved when rearing was carried out in water containing antibiotic (oxytetracycline at a dose of 5 to 20 mg-L~'). Survival rate and final mean body weight of larvae as high as those obtained using antibiotic were also reached with applications of disinfectants such as chloramine-T and formalin. The use of these disinfectants is recommended for commercial P. hypophthalmus hatcheries.

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Rapid phenotypic changes of reproductive traits in response to experimental modifications of spatial structure in Nile tilapia, Oreochromis / Marc Legendre

Public ISBD Faire une suggestion d'achat Titre : Rapid phenotypic changes of reproductive traits in response to experimental modifications of spatial structure in Nile tilapia, Oreochromis Type de document : texte imprimé Auteurs : Marc Legendre, Auteur Importance : pp. 145-152 Langues : Anglais (eng) Index. décimale : 578 Histoire naturelle des organismes vivants Résumé : The reproductive characteristics of Oreochromis niloticus, a multiple spawner, have been compared between populations submitted experimentally to three types of spatial structure. Fish from a same original stock were divided and reared for 2 months in: 1) concrete tanks with a bare bottom, 2) concrete tanks with a sandy bottom, or 3) concrete tanks equipped with an artificial reef. The females were then killed and their gonads examined for sexual stage and fecundity determination. Fecundity was inversely correlated to the spatial complexity of the environment whereas oocyle size tented to increase together with spatial complexity. Females placed in tanks with artificial reefs presented a lower fecundity and reproductive investment and bigger oocytes than those maintained in the bare bottom tanks. Fish reared in tanks with a sandy bottom had intermediate reproductive traits. The response of females to changes in the spatial structure of their environment was observed after only one or two reproductive cycles, providing the first experimental evidence of such rapid phenotypic adaptation to environmental complexity. The results also indicate that the perception of living space, arising from the availability of refuges and spawning sites, is more likely to influence the reproduction of tilapias than substrate quality. Rapid phenotypic changes of reproductive traits in response to experimental modifications of spatial structure in Nile tilapia, Oreochromis [texte imprimé] / Marc Legendre, Auteur . - [s.d.] . - pp. 145-152. Langues : Anglais (eng) Index. décimale : 578 Histoire naturelle des organismes vivants Résumé : The reproductive characteristics of Oreochromis niloticus, a multiple spawner, have been compared between populations submitted experimentally to three types of spatial structure. Fish from a same original stock were divided and reared for 2 months in: 1) concrete tanks with a bare bottom, 2) concrete tanks with a sandy bottom, or 3) concrete tanks equipped with an artificial reef. The females were then killed and their gonads examined for sexual stage and fecundity determination. Fecundity was inversely correlated to the spatial complexity of the environment whereas oocyle size tented to increase together with spatial complexity. Females placed in tanks with artificial reefs presented a lower fecundity and reproductive investment and bigger oocytes than those maintained in the bare bottom tanks. Fish reared in tanks with a sandy bottom had intermediate reproductive traits. The response of females to changes in the spatial structure of their environment was observed after only one or two reproductive cycles, providing the first experimental evidence of such rapid phenotypic adaptation to environmental complexity. The results also indicate that the perception of living space, arising from the availability of refuges and spawning sites, is more likely to influence the reproduction of tilapias than substrate quality.

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