シマアジ稚魚におけるEPAとDHAの要求量およびリン脂質添加効果〔英文〕

概要

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A feeding experiment was conducted to determine the requirement for juvenile striped jack of eicosapentaenoic acid (EPA) and/or docosahexaenoic acid (DHA) and growth-enhancing effect of phosphatidyl choline (PC) and phosphatidyl ethanolamine (PE) when they were supplemented to defatted fish meal diets containing 0.05% n-3 highly unsaturated fatty acids (n-3HUFA). Fish fed a diet without supplemental essential fatty acids (EFA) showed low feed efficiency and high mortality was observed after 7 days of feeding (21 days from pre-feeding experiment), even though no external deficiency sign was visible. The cumulative mortality of this group was 48% after the 16th day. The results of this experiment on the EFA of juvenile striped jack can be concluded as follows: 1) DHA is more effective than EPA as EFA; 2) requirement for DHA alone is about 1.7% in diet; 3) EPA content in diet should be less than 0.8% to prevent ill effects; 4) the ratio 18:1 to n-3HUFA in polar lipid fraction of whole body can be used as an EFA index for striped jack, a ratio less than 1 satisfying the EFA requirement; 5) Supplementation of 1.5% PC promoted good growth until about 3.3g body weight, whereas PE was in-effective.