脂肪酸組成の異なるワムシのアユ仔魚に対する餌料効果

概要

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A comparison of dietary value for Ayu larvae of rotifers cultured with various kinds of yeasts, produced by supplementing 18:2ω6, 18:3ω3 and cuttlefish liver oil to the culture medium of baker's yeast, Saccharomyces cerevisiae, respectively, was made in order to investigate the EFA requirement of Ayu. These rotifers were found to contain high amounts of 18:2ω6, 18:3ω3 and ω3 highly unsaturated fatty acids (ω3 HUFA), respectively. The best growth rate was obtained in the fish fed on the rotifers containing ω3 HUFA, followed by the fish on the rotifers containing 18:3ω3. The fish receiving the rotifers containing 18:2ω6 showed lower growth rate and higher mortaliy than those fed on the fotifers cultured with baker's yeast, suggesting that 18:2ω6 has no EFA value on the growth of Ayu. Feeding the rotifers containing respectively 18:2ω6 and 18:3ω3 brought about a slight elevation in the proportion of 20:4ω6 and 20:5ω3 acids in the total lipids of the fish, suggesting the conversion of 18:2ω6 to 20:4ω6 and 18:3ω3 to 20:5ω3. These results indicate that ω3 HUFA such as 20:5ω3 and 22:6ω3 have an EFA value for larval Ayu as for the other fish species.
日本水産學會の論文