Journal
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
Volume 65, Issue 8, Pages 1738-1748Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/F08-088
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- Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning [22.3/2001-1905]
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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 tooether, 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.
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