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Approches bibliographique et expérimentale de méthodes permettant d'évaluer l'état de maturité sexuelle des bivalves ArchiMer
Thielley, Maryse.
A l'heure actuelle, l'objectif des éc10series d'huîtres est d'atteindre une autonomie d'approvisionnement en larves quelle que soit la saison et donc d'étaler les émissions de gamètes sur toute l'année. A la suite de problèmes rencontrés pour atteindre cet objectif, il s'est avéré nécessaire d'entreprendre des études sur les méthodes à mettre en oeuvre pour contrôler la qualité de la reproduction en écloserie et notamment l'état de maturité des géniteurs. Notre étude porte sur ce dernier point. Une étude bibliographique présente les différentes méthodes plus ou moins précises, actuellement utilisées pour contrôler l'état de maturité des gonades de bivalves. La majorité d'entre elles nécessite le sacrifice d'animaux. Une approche expérimentale portant...
Tipo: Text Palavras-chave: Crassostrea gigas; Bivalves; Reproduction; Maturité sexuelle; Biopsie.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00419/53094/54051.pdf
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Exploitation, biologie et dynamique du stock de langouste rouge de Corse, Palinurus elephas Fabricius ArchiMer
Marin, Jean.
The European red spiny lobster (Palinurus elephas) is the main target species of the small-scale fishery in Corsica. This fishery was described, its trends from 1981 to 1964 were analysed, and the exploitation conditions of the spiny lobster stock (fishing grounds, strategy and gear ; fishing regulations) were explained. Furthermore, the fishing effort and the yields were estimated through an indirect survey, in 1983 and 1984 . The growth was studied through tagging experiments. Growth increment per moult, Von BERTALANFFY's equation parameters, and moulting frequency were estimated for both sexes. Bias risks associated to tag loss at moulting were also analysed. In addition, estimates of K and L∞ variances were provided through "Jack-knife"...
Tipo: Text Palavras-chave: Palinurus elephas; Fishery biology; Population dynamics; Fecundity; Recruitment; Sexual maturity; Growth; Stock assessment; Sensibilité; Fécondité par recrue; Rendement par recrue; Analyse des cohortes; Maturité sexuelle; Croissance; Pêcherie; Langouste.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/these-1036.pdf
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Observations sur la maturité sexuelle et la ponte du tourteau Cancer pagurus en Manche ArchiMer
Latrouite, Daniel; Noel, Philippe.
Few observations have been reported on the reproductive cycle and size at maturity of female edible crab in the Channel. This could be linked to non catchability of berried females. During the present study carried over three different years, females were taken from commercial catches prior to the spawning period and placed in tanks in the laboratory. The various criteria used to establish the mean size at first maturity are discussed and the relation between size and functional maturity is described. The smallest berried females are at a carapace length of 76mm, and maximum values are reached at about 105mm. The mean value is between 85 and 90mm carapace length. The duration of the spawning period was the same in each years, extending from mid-November to...
Tipo: Text Palavras-chave: Spawning; Sexual maturity; Reproduction; Channel; Cancer pagurus; Edible crab; Reproduction; Ponte; Manche; Tourteau; Maturité sexuelle; Cancer pagurus.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/1993/acte-1420.pdf
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