Abstract

Abstract At a dietary level of 10 mg/kg of wet food (= 11.5 mg/kg dry food) the organophosphorothionate insecticide, fenitrothion, does not affect growth or dominance patterns of brook trout (Salvelinus fontinalis) at dry ration levels up to 4.45% of body dry weight per day. The method devised for this study allows the individual ration per fish per day to be determined for small groups of up to 20 fish per tank. The method is useful in fish toxicology, where effects of exposure to dietary contaminants must be determined; for testing individual growth and food conversion efficiency; and in determining behavioral dominance patterns.

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