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Underyearling rainbow trout (Salmo gairdneri) in experimental stream tanks presented with live and dead prey preferred live prey. Trout fry generally were size selective predators and previous feeding experience did not affect the size of prey consumed. When a wide range of prey sizes was offered, larger trout fry fed upon bigger prey than did smaller fry. Cyclops were underrepresented in trout fry stomachs relative to Daphnia of similar size.
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Irvine et al. (1983) studied this question.
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