Abstract

Abstract Tilapia (Tilapia mossambica) were evaluated as a substitute fish meal for salmonid diets. Male and female tilapia of different sizes were analyzed for protein, lipid, ash, and gross energy content. Dry matter averaged 58% protein, and did not differ between sexes or sizes. Large (200 g) female tilapia had higher lipid and gross energy contents than did small females or males. Tilapia meal prepared from the entire body of small (100 g) male and female tilapia averaged 61% protein, 20% lipid, and 4.99 kcal/g of dry matter. Tilapia meal was substituted for herring meal in the Colorado standard diet. The growth and chemical composition of the carcass of rainbow trout (Salmo gairdnerf) fed the two diets did not differ.

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