Data/hora: 01/06/2024 18:11:06

Provedor de dados: | 5
País: | France
Título: | Comparison of methods for stock assessment of European hake Merluccius merluccius in the Gulf of Lions (Northwestern mediterranean)
Autores: | Aldebert, Yvonne; Recasens, Laura.
Data: | 1996
Ano: | 1996
Palavras-chave: | Merluccius merluccius; Méditerranée; Méthodologie; Évaluation des stocks; Démographie des captures; Mortalité par pêche; Merluccius merluccius; Mediterranean Sea; Methodology; Stock assessment; Population structure; Fishing mortality.
Resumo: | European hake Merluccius merluccius is the main commercial demersal species in the Gulf of Lions (Northwestern Mediterranean). This fish is exploited by French and Spanish trawler fleets and by small-scale fisheries using gillnets and longlines. Data on landings and the demography of catches by type of gear are now available for the period 1988-1991. The assessment of the hake stock was carried out using methods of virtual population analysis (VPA), or cohort analysis, based respectively on mean pseudocohorts and cohorts by age. The results of these VPA were then analysed and compared from a methodological point of view. The general results have confirmed previous studies with regard to the level of exploitation of the species. The two methods gave quite similar results for fishing mortality rates and for mean biomass. The maximal fishing mortality rate was observed at age 4, but it was already high at age 1, due to the exploitation of juveniles by trawlers. The mean biomass was about 7000 tons. The high values for turnover (about 80% or more) and for the maximal biomass/mean biomass ratio (23% or more) indicated a high level of exploitation but did not seem high enough to be dangerous for the stock. Yield-per-recruit analysis showed also that the present level of exploitation is far above the optimal sustainable level.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00188/29886/28341.pdf

DOI:10.1051/alr:1996003

Editor: | Gauthier-villars
Relação: | http://archimer.ifremer.fr/doc/00188/29886/
Formato: | application/pdf
Fonte: | Aquatic Living Resources (0990-7440) (Gauthier-villars), 1996 , Vol. 9 , N. 1 , P. 13-22
Fonte: | IFREMER-Gauthier-Villars