Abstract
When pairs of bluegills (Lepomis macrochirus Rafinesque) were kept in bare, 10-gal compartments for 5 days, dominant–submissive relations developed, and the dominant fish survived a subsequent exposure to 32 mg/liter zinc longer than submissive fish. A flowerpot shelter in each compartment reduced the number of aggressive encounters between fish and removed the response difference. These results indicate that dominant–submissive relations may be a source of variability in the results of bioassays that use fish.
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