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Estimating exploitation rates of migrating yellowtail flounder (Limanda ferruginea) using multistate mark–recapture methods incorporating tag loss and variable reporting rates

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Multistate mark–recapture models can be used to model migration through stratification of the study area into states (location). However, the incorporation of both tag loss and reporting rates is new to the multistate paradigm. We develop a migration model for fish that incorporates tag loss and reporting rates but has as its primary purpose the modelling of exploitation and natural mortality rates. This model is applied to a 2000–2004 yellowtail flounder (Limanda ferruginea) tagging study on the Grand Bank of Newfoundland, Canada. We found that exploitation rates varied over both location and years, ranging from 0.000 to 0.047. Migration into the centre of the Grand Bank (state 2) was three times higher than migration out. The estimate of the instantaneous annual natural mortality rate was 0.256, which is equivalent to an annual survival rate of 0.880. We describe how these mortality estimates will be quite valuable in specifying an assessment model for this stock.

Les modèles de marquage et de recapture à états multiples peuvent servir à décrire la migration à travers la stratification de la zone d’étude comme des états (sites). Cependant, l’incorporation à la fois des pertes d’étiquettes et des taux de retour d’étiquettes est nouvelle dans le paradigme des états multiples. Nous mettons au point un modèle de migration des poissons qui incorpore les pertes d’étiquettes et les taux de retour, mais dont l’objectif principal est la modélisation des taux d’exploitation et de mortalité naturelle. Nous appliquons le modèle à des données de marquage de 2000–2004 de la limande à queue jaune (Limanda ferruginea) sur le Grand Banc de Terre-Neuve, Canada. Les taux d’exploitation varient en fonction à la fois des sites et des années, de 0,000 à 0,047. La migration vers le centre du Grand Banc (état 2) est trois fois plus importante que la migration vers l’extérieur. Nous estimons le taux annuel instantané de mortalité naturelle à 0,256, ce qui est l’équivalent d’un taux annuel de survie de 0,880. Nous décrivons comment ces estimations de la mortalité seront d’une grande utilité pour définir un modèle d’évaluation de ce stock.

Document Type: Research Article

Publication date: August 1, 2009

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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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