Abstract
A 20-week feeding experiment was conducted to study the effects of dietary fatty acid composition on growth and smolting of underyearling masu salmon, Oncorhynchus masou, using purified test diets. Partial replacement of basal lipid (5% palmitate and 5% oleate) with a mixture of linoleate and linolenate improved the % weight gain and feed efficiency by 220% and 160%, respectively, over those of fish fed the basal diet. This treatment also distinctly improved the rate of smolt production. By contrast, partial replacement of the basal lipid with linoleate alone failed to show any effects on performance of the fish. These results suggest that dietary fatty acid composition not only influences growth but also smolting. Proportions of long-chain polyunsaturated fatty acids in the polar lipids of the smolts were relatively higher than those of the parr, when the fish were fed the purified test diet. The fatty acid composition of the smolts resembled the typical seawater lipid pattern, even though they were reared under freshwater conditions.
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