Data/hora: 09/06/2024 09:21:23

Provedor de dados: | 5
País: | France
Título: | Exploitation, biologie et dynamique du stock de langouste rouge de Corse, Palinurus elephas Fabricius
Autores: | Marin, Jean.
Data: | 1987-07
Ano: | 1987
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.
Resumo: | 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&amp;#8734; variances were provided through "Jack-knife" method. Sexual maturity mean sizes of males and females were determined from physiological criteria and external functional indices. For females, the correspondence between ovarian maturation, reproduction and moulting was described. The estimates of the fishing mortality rates, through cohort analysis, are low. After full recruitment in the fishery, the male catchability is being unchanged, meanwhile the female one is decreasing regularly. This diminution is thought being related to breeding activity. The yield per recruit study suggested the robustness of the stock, and showed that it was around the MSY according to the fishing pattern in force. The fecundity per recruit estimates were expressed referring to the unexploited stock. Finally, sensivity analyses were performed in order to investigate different uncertainty consequences on the estimates.
Tipo: | Text
Idioma: | Francês
Identificador: | http://archimer.ifremer.fr/doc/1987/these-1036.pdf
Editor: | Université d'Aix-Marseille II
Relação: | http://archimer.ifremer.fr/doc/00000/1036/
Formato: | application/pdf