脂肪酸組成からみたシオミズツボワムシの栄養価

概要

論文の詳細を見る
The relationship between the nutritional quality of rotifer Brachionus plicatilis as a living feed in the seed production of fish and its culture media (such as baker's yeast and Chlorella) was investigated from the viewpoint of essential fatty acids (EFA) for fish. The rotifers cultured with yeast were quite low in the content of ω3 highly unsaturated fatty acids (ω3 HUFA) and high in the content of monoethylenic fatty acids, whereas those cultured with marine Chlorella were found to contain a high amount of 20:5ω3, which is one of the EFA for marine fish. The difference in the concentration of 20:5ω3 was also found to be attributable to the difference of fatty acid compositions between yeast and marine Chlorella. These results may explain why the rotifers cultured with yeast are always inferior to those cultured with marine Chlorella in their nutritional quality as a living feed. On the other hand, the rotifers cultured with freshwater Chlorella were high in the contents of 18:2ω6 and 18:3ω3, but low in the content of ω3 HUFA, suggesting that marine Chlorella is much more suitable than fresh-water Chlorella as a culture medium for rotifers when used as a living feed in the seed production of marine fish. Thus, the present study has demonstrated that the content of ω3 HUFA in the rotifers is the principal factor in the dietary value of rotifers as a living feed.
日本水産學會の論文