伊勢湾産イカナゴ親魚の体脂肪の変動

概要

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Fat deposit of the spawners of sand-eels was examined in relation to their maturity and reproduction on the basis of samples collected at Toshi Island from 5th December 1974 to 17th February 1975. Maximal gonad weight was about 21% of body weight in mean during spawning season in December 1974. Then, abrupt decreases of gonad index and population maturity was found in late December 1974 to January 1975. Decreases of weight and fat deposit without viscera were observed in Cecember to January. Rapid deposition of fat and growth increment began in accordance with vigorous feeding in February. Fluctuation of the fat deposit and body weight in relation to their maturity and reproduction was more marked in the fish of 2+ year class than in those of 1+ year class.
日本水産學會の論文