絶食によるニジマス成魚の脂質の変化

概要

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Two groups of rainbow trout fed on fish meal diet (control group) and petroleum yeast-combined diet (PY group) for 16 months were reared for 55 days without feeding in 17°C experimental ponds. The changes in body, liver, gonad, and other visceral weight, lipid contents of gonads, viscera, and flesh, and some constituents of liver and plasma were studied. Body weight decreased 4.8-4.9g/day/kg until the 31st day. Although the lipid contents of tissues decreased extremely slowly the total lipid reduction per kilogram initial body weight was 0.41g/day in flesh and 0.46g/day in viscera due to the decrease in tissue weight. On the 40th day in the control group and 55th day in the PY group, tardy fall of the body weight and plasma glucose level, and temporary increase of plasma triglyceride were observed. There was little change in free fatty acid and triglyceride contents of liver though glycogen contents dropped sharply during early fasting. Comparison of the starved and fed groups on the 55th day showed that the starvation seemed to have little effect on the start of maturation. There were no clear differences between the two groups within the limits of the obtained data.
公益社団法人日本水産学会の論文