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Juvenile steelhead trout (Salmo gairdneri) compete for access to space and food, and the distribution of these resources within a population affects the relative growth and survival of individuals. Aggression is a means of competing for these limited resources. This thesis examines the causes of aggression and growth depensation (size divergence) in juvenile steelhead. The sizes of socially isolated juveniles diverged less with time than those of groups of interacting steelhead, although average growth rates were equivalent indicating that the presence of competitors affects relative growth. A behavioural mechanism resulting in unequal food acquisition or growth efficiency is indicated, as rations were in excess of requirements. Size-matched pairs of steelhead established hierarchies in which dominants grew 12.3% faster than subordinates although rations were equal. Therefore, factors other than access to food (possibly stress) play a role in growth depensation. Groups of steelhead grew faster when the inter-
Abbott, Jeremy C.. 1991. Feeding Aggression and Growth in Juvenile Steelhead Trout (Salmo gairdneri). Ministry of Environment. Fisheries Technical Circular. FTC93
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