Increased Growth Produced by Gelatin in Trout Fed Meatless Diets. ∗

Summary

It has been shown that growing trout require a diet containing fresh meat. Mixed diets devoid of fresh meat did not produce any increase in the growth of trout, Varying the nature of the dried liver fractions used did not stimulate growth. When these diets were enclosed in gelatin capsules and force fed to the fish, a marked gain in weight was obtained. Supplementing the meatless diets with gelatin resulted in satisfactory initial growth. The supplemented diets did not sustain continuing growth beyond 7 weeks suggesting that further deficiencies exist in these rations.