Influence of Varying Lipid Concentrations with Two Protein Concentrations in Diets for Rainbow Trout (Salmo gairdneri)

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Abstract
The sparing action of dietary lipids on protein observed in rainbow trout was demonstrated in practical trout diets. The digestible energy content of a diet in relation to the percent of dietary protein (DE/P ratio) can be a determining factor in the protein requirements of rainbow trout. The DE/P ratio of the diet was positively correlated with protein retained (%) by the fish but with no other factors measured in this study. Growth, feed conversion, and daily length increment were all correlated with the energy content of the diet. Increased amounts of digestible energy in the diet also enhanced the efficient use of that energy. Diets containing high percentages of fat produced fatter fish with lower percentages of protein.

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