ニジマスに対するω3高度不飽和脂肪酸の栄養価〔英文〕

概要

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Feeding experiments were conducted to compare the effects of ω3 highly unsaturated fatty acids (HUFA, 20:5ω3:22:6ω3=1:1) and docosahexaenoic acid (22:6ω3) with that of linolenic acid (18:3ω3) on growth and fatty acid composition of rainbow trout. Addition of ω3 fatty acids, not only 18:3ω3 but also 22:6ω3 and HUFA even at low levels, to an EFA-deficient diet vastly improved growth and feed conversion. Supplemental effects of 0.25% 22:6ω3 and 0.25% HUFA on the growth of rainbow trout were comparable to that of 0.5% 18:3ω3 and those of 0.5% 22:6ω3 and 0.5% HUFA slightly exceeded those of 1 to 3% 18:3ω3. The diet containing 1% 22:6ω3 or 1% HUFA gave the best weight gain and the best feed conversion. These results, together with EFA index and analytical data, indicated that rainbow trout responded better to dietary 22:6ω3 and HUFA than to 18:3ω3 and that 22:6ω3 and HUFA were more effective as EFA than 18:3ω3. Feeding the EFA-deficient diet resulted in raising the levels of the “abnormal” polyunsaturated 20:3ω9 and monoethylenic fatty acids, 16:1 and 18:1, and these levels were lowered by both 22:6ω3, HUFA and 18:3ω3. HUFA and 22:6ω3 appeared to be more efficient than 18:3ω3 in reducing the level of these fatty acids.
日本水産學會の論文