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	Provedor de dados ArchiMer (2) Autor Mesnil, Benoit (1) Pelletier, Dominique (1) Palavra-chave Virtual Population Analysis (2) Analyse de population virtuelle (1) Analyses de cohortes (1) Delta-method (1) Discards (1) Estimation de la variance (1) Multiple-fleet fisheries (1) Méthode Delta (1) Pêcheries multi-métiers (1) Rejets (1) Rendement par recrue (1) Sensibilité (1) Sensitivity (1) Stock assessment (1) Variance estimation (1) Yield per recruit (1) Évaluations de stocks (1) Mais... Tipo do documento Text (2) Ano 1996 (1) 1990 (1) País France (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Sensitivity and variance estimators for virtual population analysis and the equilibrium yield per recruit model ArchiMer Pelletier, Dominique. Fish stock assessment makes Widespread use of Virtual Population Analysis (VPA) and long-term equilibrium prediction models. Although there have been some statistical investigations about the properties of VPA results, apparently there are no complete analyse about predictions statistical and numerical behaviour. However, management decisions generally rely upon production forecasts. This paper compares stability properties of VPA and the yield per recruit model with regard to various errors concerning all the input parameters. Robustness fis assessed by means of first-ordo sensitivities whereas variances are inferred from delta-method estimators. Sensitivity of yield per recruit appears to be mainly due to terminal mortality rate and age-specific weights,... Tipo: Text Palavras-chave: Analyse de population virtuelle; Rendement par recrue; Sensibilité; Estimation de la variance; Méthode Delta; Virtual Population Analysis; Yield per recruit; Sensitivity; Variance estimation; Delta-method. Ano: 1990 URL: http://archimer.ifremer.fr/doc/00189/30068/28556.pdf When discards survive: Accounting for survival of discards in fisheries assessments ArchiMer Mesnil, Benoit. When discards data are included in fish stock assessments, it is generally assumed that all discarded animals die. However, there are fisheries in which a significant fraction of discards are able to survive. This case can be treated with a simple extension of the usual analytical model of exploited populations, enabling Virtual Population Analysis (VPA) to be used for parameter estimation. The paper examines the effects on estimates obtained by VPA when discards are allowed to survive, and validates a procedure for deriving partial fishing mortalities in multiple-fleet fisheries where discarding and survival rates are fleet specific. Tipo: Text Palavras-chave: Évaluations de stocks; Rejets; Analyses de cohortes; Pêcheries multi-métiers; Stock assessment; Discards; Virtual Population Analysis; Multiple-fleet fisheries. Ano: 1996 URL: http://archimer.ifremer.fr/doc/00179/29032/27466.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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