養殖マダイの絶食時における血液,肝すい臓成分などに与える水温の影響〔養殖マダイの生理学的研究-5-〕

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Separate groups of about 70 individuals each of red sea bream, Chrysophrys major, weighing 272g on the average were kept in cold water of an ambient temperature of 8.3-12.2°C and in warm water controlled at 19.5-21.0°C without feeding. After 1, 2, 3, 5, 11, 25, and 41 day (s), 7 to 9 individuals from each group were sacrificed for chemical analysis and histological observation. In the hepatopancreas, glycogen decreased markedly within 5 days in both groups. On the contrary, fat kept increasing to the end of the experiment. Histologically, oil droplets increased in size and had a tendency to gather around the pancreatic tissue. In the serum of both groups, gradual decreases in the contents of triglycerided, total cholesterol, and protein and in the activity of alkaline phosphatase were noted. Blood sugar level showed little change in the cold water group, but decreased in 25 days in the warm water group. Prolonged fasting caused atrophy of parenchymal cells and nuclei in the hepatopancreas in both groups, which was more conspicuous in the warm water group. The atrophy of cells was considered to be induced by the depletion of glycogen.
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