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Choline Metabolism and Nutritional Requirement of Lake Trout (Salvelinus namaycush)¹

United States Fish and Wildlife Service, Tunison Laboratory of Fish Nutrition, Cortland, New York 13045

Abstract

Duplicate lots of 2-g lake trout (Salvelinus namaycush) were fed a purified diet alone and with equimolar supplements of aminoethanol, methylaminoethanol, dimethylaminoethanol, choline or betaine. Supplements of choline, methyl- and dimethylaminoethanol significantly increased growth rate and reduced liver fat content, whereas aminoethanol and betaine did not. These results suggest that trout biosyn-thesize choline from methyl- and dimethylaminoethanol but not from aminoethanol or betaine.

In another experiment triplicate lots of 5-g trout were fed diets containing graded levels (0, 500, 1,000, 2,000 and 4,000 mg/kg) of choline. Growth results showed that the requirement for choline is no greater than 1,000 mg/kg of diet.

¹ The author thanks Dr. Roger L. Herman, Eastern Fish Disease Laboratory, Kearneysville, West Virginia, for examining the experimental fish and Reginald C. Angeli, of the Tunison Laboratory, for technical assistance.