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The Relative Growth of Dominant and Subordinate Juvenile Steelhead Trout (Salmo Gairdneri) Fed Equal Rations

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The hypothesis that behavioural dominants experience growth advantages relative to subordinates was tested in size-matched pairs of juvenile steelhead trout (Salmo gairdneri). Even though access to food was equalized, dominants grew 12.3% faster on average than paired subordinates. As subordinates were less active than dominants this growth difference is attributed to the physiological costs of "stress".


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Affiliations: 1: Department of Biological Sciences, Simon Fraser University, Burnaby, B.C. Canada V5A 1S6


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