Abstract
Two experiments with bluegill sunfish (Lepomis macrochirus Rafinesque) showed that (1) dominant fish were more active in the home tank than subordinates and isolated individuals, and (2) dominants and subordinates did not differ in activity during the initial 20 min of inhabiting a new tank; but both of these animals exhibited higher activity levels than isolates placed into a new tank. Restricted activity of subordinate fish in the home tank may be based on the fact that movement elicits attacks from the dominant fish. Behavior of isolates in a new environment probably derives from increased fearfulness produced by social isolation.
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