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Plasma-free amino acids were studied in two groups of adult rainbow trout (346 ± 107 g mean body weight) fed for 6 weeks a control diet containing intact protein (fish meal, poultry meal, feather meal, corn), or a diet based on a crystalline amino acid mixture. After 2 days starvation, those fish which received intact protein were forced-fed with wheat gluten; trout given the amino acid diet were...