利尻島産イトマキヒトデの繁殖期
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概要
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The gonads of the starfish, Asterina pectinifera, in the north Hokkaido were histologically examined during two years. In June and July, rapid growth of gonads was induced in consequence of the spermiogenesis in testis and the formation of yolk and pigment granules in ovary. The testis and the ovary exhibited a full-grown state in August. In the beginning of September, the gonad wall increased in thickness. Besides, the sperms in testis decreased in amount and aggregation of the follicle cells occurred in ovary. Thus, it was concluded that the breeding of the starfish in this Island was achieved in the beginning of September. Thereafter, ovarian development was seen again in autumn. But, in winter the ovary remained in the state of rest.
- 日本水産學會の論文
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- 利尻島産イトマキヒトデの繁殖期
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