形態の異なる油脂を直接法による強化したアルテミアのイシダイおよびマダイ仔稚魚に対する餌料価値〔英文〕

概要

論文の詳細を見る
Two experiments were conducted to compare the dietary value of Artemia enriched with various types of oil, such as triglycerides (TG), methyl esters (ME), ethyl esters (EE), and free fatty acids (FFA) containing about 43% of n-3 highly unsaturated fatty acids (n-3HUFA), based on the growth, survival and chemical compositions of larval striped knifejaw and red sea bream. Both larval striped knifejaw and red sea bream fed on nauplii enriched with TG, ME, and EE for 10 and 14 days showed good results in growth, survival and activity tests. These nauplii con-tained 4.1-7.1% n-3HUFA on a dry basis. The former larvae fed on nauplii without treatment or fed on FFA (1.0-1.7% n-3HUFA) showed poor feed performances. Incorporation of n-3HUFA into Artemia by emulsified FFA was very low due to coagulation of FFA during enrichment, leading to poor feed performances. Red sea bream fed on newly-hatched nauplii with 1% n-3HUFA but without docosahexaenoic acid (DHA) showed a high survival rate, but quite low activity. The concentration of eicosapentaenoic acid (EPA) plus DHA in polar lipids of both species fed on nauplii without enrichment or with FFA was somewhat lower than that of fish fed on nauplii enriched with TG, ME, and EE. The value was highest in fish fed on EE-fed Artemia. Thus, the dietary value of Artemia to both species was effectively improved by enrichment with TG, ME, and EE, especially with EE.