Differentiating mortality from delayed migration in subyearling fall Chinook salmon (Oncorhynchus tshawytscha)

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Abstract:

A total of 1154 acoustic-tagged subyearling fall Chinook salmon (Oncorhynchus tshawytscha) were monitored during their movement through Lower Monumental Reservoir, Snake River, Washington, USA. A release–recapture design was developed to partition their fates into migration, delayed migration (i.e., holdover or temporary residualization), and mortality using a series of standard detection arrays augmented with individual intrareach autonomous receivers. The standard detection arrays were used in conjunction with traditional release–recapture models to estimate the joint probabilities of migrating and surviving through the reservoir. Closed population estimators were used to estimate the abundance of tagged fish still alive in the river reaches and to differentiate mortality from delayed migration. Over the course of the study from 15 August to 14 November 2007, delayed migration rates increased and mortality rates generally declined. A minimum of 10.6% of the fish were estimated to have delayed migration in the reservoir during the study period.

Nous avons suivi un ensemble de 1154 saumons chinook (Oncorhynchus tshawytscha) d’automne âgés de moins d’un an et porteurs d’une étiquette acoustique au cours de leurs déplacements à travers le réservoir Lower Monumental, sur la rivière Snake, Washington, É.-U. Nous avons mis au point un plan de libération–recapture afin de répartir leur sort en migration, migration retardée (c’est-à-dire arrêt ou résidence temporaire) et mortalité à l’aide de réseaux standards de détection avec en plus des récepteurs autonomes individuels dans les différentes sections de rivière. Les réseaux standards de détection ont été utilisés conjointement avec des modèles traditionnels de libération–recapture afin d’estimer les probabilités conjointes de migrer et de survivre à travers le réservoir. Des estimateurs de population fermée ont servi à déterminer l’abondance des poissons marqués encore vivants dans les sections de rivière et de distinguer la mortalité de la migration retardée. Au cours de l’étude, du 15 août au 14 novembre 2007, les taux de migration retardée ont augmenté et les taux de mortalité ont en général décliné. Nous estimons qu’un minimum de 10,6% des poissons ont retardé leur migration dans le réservoir durant la période d’étude.

Document Type: Research Article

Publication date: December 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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