アスコルビン酸欠乏ニジマスにおける変形魚の発生に及ぼす飼育水温の影響〔英文〕

概要

論文の詳細を見る
The effect of rearing water temperature on the skeletal deformity in ascorbic acid-deficient rainbow trout, weighing 0.17g on average, was investigated. Three groups of fish were fed a diet at one of three ascorbic acid levels, i.e., 0, 2, and 200mg of L-ascorbic acid per 100g of diet, and were maintained either at 16°C or at 20°C for 20 weeks. Two other groups were given a diet at one of two ascorbic acid levels, i.e., 0 and 200mg of L-ascorbic acid per 100g of diet, and maintained at 16°C for the first 10 weeks and at 20°C for the last 10 weeks. Lower growth was observed in the groups maintained at 20°C irrespective of dietary ascorbic acid levels. The skeletal deformity was observed only in the ascorbic acid-deficient groups. The rate of development of skeletal deformity increased markedly in the group which was maintained initially at 16°C with subsequent rise of water temperature to 20°C. These results indicate that underhydroxylated collagen in the tissues of ascorbic acid-deficient fish is denatured and digested quickly at higher water temperature, resulting in the low collagen content of the connective tissues, and finally developing a fragile bone structure.
日本水産學會の論文