Consulta: subjectFacets:"Évaluation des stocks"
Registros recuperados: 4
Data/hora: 09/06/2024 04:07:02

Comparison of methods for stock assessment of European hake Merluccius merluccius in the Gulf of Lions (Northwestern mediterranean)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Aldebert, Yvonne; Recasens, Laura.
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...
Tipo: Text
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.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00188/29886/28341.pdf

Elaboration de propositions de suivi de la pêche récréative au titre de la DCSMM
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Régimbart, Amélie.
The Marine Strategy Framework Directive is based on the ecosystem approach in order to assess and manage human activities affecting marine environment. The sustainable exploitation of commercial stocks is one of the MSFD objectives. Data used for stock assessment mainly come from commercial fishery databases and scientific campaigns. However, in some cases, there is evidence that recreational fisheries have a significant impact on stocks. That is why the French monitoring program for MSFD requires to expand monitoring to some species that are not directly concerned by the Data Collection Framework. Thus, new surveys need to be conducted in order to meet the DCF and MSFD data collection requirements. We propose here to implement appropriate methods for...
Tipo: Text
Palavras-chave: Pêche récréative; Directive Cadre Stratégie pour le Milieu Marin; Programme de surveillance; Évaluation des stocks; Recreational fisheries; Marine Strategy Framework Directive; Monitoring programme; Stock assessment.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00511/62258/66459.pdf

Développement et ajustement d'un modèle de dynamique des populations structuré en longueur et spatialisé appliqué au stock Nord de merlu (Merluccius merluccius)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Drouineau, Hilaire.
The biology of European hake has been largely studied, however some specific processes of its biology, especially growth and migration, are still poorly known. Those uncertainties have consequences on the quality of the stock assessments and on the stock management by limiting the possibility to assess the effect of spatial management measures. Therefore, we develop an integrated length-structured and spatialised model of population dynamics aiming at improving the estimation of unknown parameters of the population dynamic. The model relies on a state model describing the dynamics of the population and the fishing activity, and on an observation model describing the observation processes and providing a likelihood function.  A review of the literature...
Tipo: Text
Palavras-chave: Parameters estimation; Migration; Growth; Sensitivity analysis; Likelihood; Spatialised model; Stock assessment; Length structured model; Hake; Estimation de paramètres; Migration; Croissance; Analyse de sensibilité; Maximum de vraisemblance; Modèle spatialisé; Évaluation des stocks; Modèle structuré en longueur; Merlu.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-3710.pdf

Indices of bluefin tuna (Thunnus thynnus thynnus) abundance derived from sale records of French purse seine catches in the Mediterranean sea
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Labelle, Marc; Hoch, Thierry; Liorzou, Bernard; Bigot, Jean-louis.
Sampling operations are not routinely conducted in France to monitor the landings of bluefin tuna caught by purse seiners in the Mediterranean. The length, weight and age frequencies of bluefin caught by this fleet are predicted based on sale records, length-at-age and weight-length relations, trends in fishing and natural mortality rates, and other ancillary data. The resulting length frequencies are more accurate than those predicted by Liorzou and Bigot (1992) using a simpler algorithm, and are spread more evenly across adjacent size classes. Catch-per-unil-effort (CPUE) was expressed as the numbers of age 2 bluefin caught per successful seine fishing trip in the Gulf of Lions fall fishery. CPUE indices were computed by several methods, and compared to...
Tipo: Text
Palavras-chave: Thon rouge; Senne tournante; Prises-par-unité-d'effort; Indices d'abondance; Taux de croissance; Évaluation des stocks; Mer Méditerranée; Bluefin tuna; Purse seine; Catch-per-unit-effort; Abundance indices; Growth rates; Stock-assessment; Mediterranean sea.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00188/29880/28357.pdf