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Journal of Nutrition Vol. 103 No. 6 June 1973, pp. 916-922
Copyright © 1973 by American Society for Nutrition
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The Response of Rainbow Trout to Varying Protein/Energy Ratios in a Test Diet1,2,

D. J. Lee and G. B. Putnam

Department of Food Science and Technology, Oregon State University, Corvallis, Oregon 97331

Nine semipurified diets containing protein/energy ratios that ranged from 73 to 162 mg protein/kilocalorie were fed to young rainbow trout for 18 weeks. A casein-gelatin (70–30) mixture and herring oil were each fed at three levels in a factorial type of experiment. Each of the casein-gelatin levels (36, 44 and 53%) was fed at each of the fat levels (8, 16 and 24%). Cornstarch was added at the expense of the casein-gelatin mix to adjust dietary protein levels. Caloric intake regulated feed consumption; and except for diets low in both fat and protein, no significant differences in weight gains were noted, although feed and energy conversions were markedly influenced. Higher protein/calorie ratios were positively correlated with liver size, level of liver sugars, percentage body fat, percentage body protein, and negatively correlated with percentage liver lipids, size of gastrointestinal tract and gain/gram ingested protein. These correlations were observed for similar protein/calorie ratios regardless of the dietary levels of protein and lipid.

KEY WORDS: • rainbow trout • protein/energy ratios • feed conversion • liver size • liver carbohydrate • body lipids • energy conversion

1 Technical paper no. 3485, Oregon Agricultural Experiment Station, Corvallis, Oregon 97331.

2 This work was supported by the National Oceanic and Atmospheric Administration Office of Sea Grants. Department of Commerce, under Grant 2-35187.

Manuscript received 13 December 1972.




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