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No indications of Atlantic salmon (Salmo salar) shoaling with kin in the Baltic Sea

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Several studies have shown that fish shoals may consist of closely related individuals. It has been found, for example, that released out-migrating salmon smolts tend to aggregate with kin, including when sibling groups have been reared separately. We used genetic microsatellite markers to test whether “shoals” of adult Atlantic salmon (Salmo salar) during the marine phase (i.e., aggregations of fish caught in drift nets at offshore feeding areas in the Baltic Sea) consisted of closely related individuals (full-siblings, half-siblings). We found no evidence of kin cohesiveness related to shoals, however. Despite a weak overall tendency for individuals assigned to the same population (river or stock) to occur together, estimates of genetic relatedness in combination with consistent heterozygote deficiencies, and results from mixed-stock analyses and assignment tests collectively indicated that shoals consisted of unrelated fish from multiple populations.

Plusieurs études ont montré que les bancs de poissons peuvent être constitués d’individus fortement apparentés. On a trouvé, par exemple, que des saumoneaux libérés lors de la migration vers la mer tendent à se regrouper avec des poissons apparentés, même lorsque des groupes de même fratrie ont été élevés séparément. Nous avons utilisé des marqueurs génétiques microsatellites pour vérifier si des «bancs» de saumons atlantiques (Salmo salar) adultes durant leur phase marine (c’est-à-dire des regroupements de poissons capturés dans des filets dérivants dans des sites d’alimentation du large dans la Baltique) consistent en des individus fortement apparentés (de même fratrie, de demi-fratrie). Nous ne trouvons, cependant, aucune indication de cohésion en fonction de la parenté dans les bancs. Malgré une tendance globale faible pour les individus assignés à la même population (rivière ou stock) à se retrouver ensemble, les estimations de parenté génétique, combinées aux déficits constants d’hétérozygotes, ainsi que les résultats des analyses de stocks mixtes et des tests d’assignation indiquent tous ensemble que les bancs sont constitués de poissons non apparentés provenant de multiples populations.

Document Type: Research Article

Publication date: 2008-08-01

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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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