On the Spawning of Cucumaria japonica SEMPER of Hokkaido

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概要

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• In order to determine the spawning period of Cucumaria japonica SEMPER we examined the gonads of the samples, which were obtained from Muroran between November, 1939 and November, 1940. In this species the gonadial tubes are found clearly all the year round and do not much wither even in the non-spawning period. The tubes are found more or less to contain ripe sexual cells nearly all the year round. Both sperm and egg are relatively large, viz., the length of the ripe egg is 540μ. and its breadth, 474μ, and the sperm has a whole length of about 67μ. Spawning of this species extends over a considerably long period, from early March to middle November, with a maximum from early or middle July to late September. During the maximum spawing period proliferation of sexual cells are very active as well as extrusion of ripe ones.

• 社団法人 日本水産学会の論文

著者

• 木下 虎一郎

  北海道水産試験場

• 澁谷 三五郎

  北海道水産試驗場

関連論文

• Induction of Spawning of the Scallop, Pecten (Patinopecten) yessoensis JAY
• The Diurnal and Tidal Changes in the Number of Larvae of Pecten and Gastrpoda in the Surface Layer of Lake Saroma. (Preliminary Report)
• On the Spawning of Cucumaria japonica SEMPER of Hokkaido
• Notes on the Life-history of Porphyra of Hokkaido:Report II. Notes on Porphyra yezoensis UEDA. (No. 2)

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