Nutrition of Protein in Young Carp-I

By repeated feeding experiments, amino acid test diets after the formulae both for salmonoid fishes and for channel catfish were found to be unable to sustain the growth of young carp. The hydrolyzates of casein after treatment with trypsin could not replace casein itself. A higher level of cellulose flour or agar-agar was effective in controlling the retention time of amino acid test diet in the intestine to the extent of that of the casein-gelatin test diet, but the growth of young carp was improved not at all. These results suggest that there is a specific aspect in the protein nutrition of young carp.