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Exploratory assessment of historical recruitment patterns using relative abundance and catch data

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Historical apparent recruitment rates can be estimated from time series of relative abundance and catch data using a simple difference equation in conjunction with assumed catchability coefficient and natural survival rate. Simple smoothing and optimal linear state estimation procedures can remove much of the variance in such estimates due to measurement error in relative abundance. The apparent patterns can be helpful to reveal important recruitment changes prior to availability of data for more complex stock assessments, provide checks on recruitments estimated by more complex assessment procedures, and provide warnings about biases in other assessment procedures that might result from using the relative abundance data for model tuning.

Des séries chronologiques de l'abondance relative et des données de capture permettent d'estimer les taux de recrutements apparents du passé lorsqu'on utilise une simple équation de différence conjointement avec le coefficient de capturabilité assumée et le taux naturel de survie. Un lissage simple et des procédures d'estimation de l'ordre linéaire optimal peuvent éliminer de ces estimations une grande partie de la variance due aux erreurs de mesure de l'abondance relative. Les patterns apparents peuvent servir à révéler des changements importants de recrutement avant que des données ne soient disponibles pour faire des évaluations plus complexes du stock; ils permettent de faire des vérifications des recrutements estimés par des méthodes plus complexes d'estimation; ils fournissent enfin des mises en garde concernant les erreurs qui peuvent survenir dans les autres méthodes d'évaluation qui utilisent les données d'abondance relative pour l'ajustement des modèles.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: September 1, 2005

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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