シマアジ稚魚のn-3高度不飽和酸要求量〔英文〕

概要

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The requirement of juvenile striped jack for n-3 highly unsaturated fatty acids (n-3 HUFA) was determined by feeding fish meal diets containing different levels on n-3 HUFA ranging from 0.7 to 3.5% in the diet. Juvenile fish weighing 0.26g and 1.78g were fed the experimental diets for 60 days in Expt. I and 56 days in Expt. II, respectively.In Expt. I after 9 days of feeding, a high mortality and poor appetite were observed in fish receiving the diet lowest in the n-3 HUFA content (0.7%). Fish fed a diet containing 1.2% n-3 HUFA also began to show a high mortality around the 55th day of feeding. On the other hand, no mortality was observed in the fish receiving the 3.5% n-3 HUFA diet in Expt. I and all the diets in Expt. II. In both experiments, growth of fish and feed efficiency were proportional to n-3 HUFA levels in the diets and reached a plateau at a level of 1.7% in the diet.Feeding diets low in the n-3 HUFA level resulted in an increase of 18:1, but not 20:3 (n-9) in the polar lipids of both whole body and liver. Elevation of dietary n-3 HUFA levels effectively reduced the 18:1 level and increased n-3 HUFA levels. From these results, the requirement of juvenile striped jack for n-3 HUFA is estimated to be around 1.7% in diet.