Some Short-term Indicators of Sublethal Effects of Copper on Brook Trout, Salvelinus fontinalis

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Abstract
Changes in cough frequency, locomotor activity, and feeding behavior of yearling brook trout appeared within 2–24 hr at copper concentrations as low as 6–15 μg/liter. Each of these responses appears to be useful for predicting the concentration range of copper likely to have no long-term effects on the species.