ニジマスに対するエイコサペンタエン酸およびドコサヘキサエン酸の添加効果〔英文〕

概要

論文の詳細を見る
A feeding experiment was conducted to compare the effects of eicosapentaenoic acid (20:5ω3) and docosahexaenoic acid (22:6ω3) with that of linolenic acid (18:3ω3) on growth and fatty acid composition of rainbow trout. The growth rate was much reduced in fish kept on a diet containing 0.5% 18:3ω3. the replacement of 0.5%18:3ω3 with either 0.5%20:5ω3 or 0.5%22:6ω3 markedly increased the growth rate. This result indicates that 20:5ω3 has the same growth enhancing effect as 22:6ω3 and that not only 22:6ω3 but also 20:5ω3 has an EFA efficiency higher than 18:3ω3. The best weight gain was obtained in fish on a diet containing 0.25%of each of 20:5ω3 and 22:6ω3 respectively, indicating an additive effect between 20:5ω3 and 22:6ω3 on the growth of rainbow trout. The ratio of 20:3ω9 to 22:6ω3 in livers, an FEA index of rainbow trout, appeared as a low value, 0.4-0.5, in the fish fed diets containing either 20:5ω3 or 22:6ω3. This indicates a nearly normal FEA status, whereas the ratio of the fish receiving 0.5% 18:3ω3 was 0.8, which indicates an insufficient EFA status. Thus it has been demonstrated that both 20:5ω3 and 22:6ω3 have a biological efficiency or an EFA efficiency higher than of 18:3ω33 and that the growth enhancing effect of Pollock liver oil is due to an additive effect between 20:5ω3 and 22:6ω3 in its fatty acid fraction.
日本水産學會の論文