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Comparison of methods for stock assessment of European hake
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 7 000 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.
Auteurs du document :
Yvonne Aldebert, Laura RecasensObtenir le document :
EDP SciencesMots clés :
Merluccius merluccius, Mediterranean Sea, methodology, stock assessment, population structure, fishing mortality, Méditerranée, méthodologie, évaluation des stocks, démographie des captures, mortalité par pêcheThème (issu du Text Mining) :
MILIEU NATURELDate :
1996-01-15Format :
text/xmlSource :
https://doi.org/10.1051/alr:1996003Langue :
AnglaisTélécharger les documents :
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Ce portail, créé et géré par l'Office International de l'Eau (OiEAU), est géré avec l'appui de l’Office français de la biodiversité (OFB)