アユ仔魚に対する油脂酵母ワムシの餌料効果〔種苗生産における栄養学的研究-11-〕

概要

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A feeding trial was conducted in otder to compare the dietary value for Ayu larvae of rotifers cultured with a new type of yeast (designated as ω-Yeast) (S-rotifer), produced by supplementing cuttlefish liver oil to the culture medium of baker's yeast, with those cultured with repectively baker's yeast (Y-rotifer) and marine chlorella Chlorella minutissima (C-rotifer). These rotifers were found to contain ω3 highly unsaturated faty acids (ω3 HUFA), the essential fatty acids (EFA) for marine fish, at levels of 26.5%, 4.6% and 12.7%, respectively. The best growth rate, expresed by the total body length, was obtained in the fish fed on S-rotifer, followed by the fish on C-rotifer. The fish receiving Y-rotifer showed lower growth rate and a higher mortality as observed in the case of marine fish. On the other hand, the appearance of deformed fish was slightl observed in all the experimental groups, without respect to the ω3 HUFA content of rotifers. The fatty acid composition of larvae was significantly affected by that of rotifers, and the fish fed on S-rotifer or C-rotifer were high in the content of ω3 HUFA. These results indicate that ω-Yest is of a superior food value for rotifes and that Ayu may require ω3 HUFA as one of the EFA for their normal growth.
日本水産學會の論文