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The objectives of this study were to determine which indicators were most responsive to suboptimal phosphorus intake in fingerling rainbow trout, and to observe the magnitude of these changes over time. Fish with an initial mean weight of 1.8 g were hand-fed one of five semi-purified wheat-gluten based diets containing between 0.23%-1.16% dietary phosphorus, or a fish meal control diet (1.8% P) for...