養魚飼料における脂質の役割に関する研究-IV : 絶食時のニジマス可食部脂肪酸組成の変化

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The rainbow trouts (Salmo irideus) were fed the diets containing three kind of methyl esters of fatty acids for ten week experimental period in previous paper1), and then they were kept non-feeding for ten weeks. The changes of the fatty acid composition in the flesh lipids caused by non-feeding were observed. The results obtained could be summerized as follows; 1) The loss of the weight of fish in three experimental groups showed little difference during non-feeding (Fig. 1). 2) The fish fed methyl esters of highly unsaturated fatty acids before non-feeding did not decrease their oil content in the flesh (Table 1). 3) Throughout experimental groups, the highly unsaturated fatty acids content in the flesh lipids increased during non-feeding for ten weeks (Table 2).