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Effect of Vitamin A and Methionine on Growth and Amino Acid Composition of Body Protein in Rainbow Trout Fingerlings

Department of Agricultural Biochemistry, University of Arizona, Tucson, Arizona 85721

A purified diet was used to investigate the effect of dietary vitamin A and methionine on growth, percentage dry weight, percentage protein, free amino acids and bound amino acids in rainbow trout fingerlings. Nine diets were used in which the level of retinyl palmitate was 1000, 2000, and 4000 IU per 100 g of diet at each of three levels of methionine. Methionine was provided in amounts of 500, 1,000 and 2,000 mg per 100 g of diet. After a feeding trial of 3 weeks there was a significant depression in percentage growth, dry weight and the ratio of bound to free amino acids in the trout fed increasing amounts of either vitamin A or methionine. At high levels of vitamin A increasing dietary methionine had an ameliorating effect on the growth depression although inhibition of growth was still present. These results indicate that rations should be balanced in the content of methionine and vitamin A for the young trout grown at 12.5°.

KEY WORDS: • vitamin A • methionine • rainbow trout • amino acid metabolism • vitamin • amino acid • fish

¹ Present address: Graduate School of Nutrition, Cornell University, Ithaca, N. Y. 14850.

Manuscript received 14 December 1973.