著者

吉田 渉 玉井 敦司 谷中 俊広 石田 幸子

出版者

弘前大学農学生命科学部

雑誌

弘前大学農学生命科学部学術報告 (ISSN:13448897)

巻号頁・発行日

no.4, pp.16-23, 2002-03-27

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We indicated that the breeding season of Stichopus japonicus Selenka living in Mutsu Bay is from May to August based on the analysis of several reports. The adult sea cucumbers transferred from cool sea water (10℃) to warm sea water (20℃) started ejaculation and spawning within an hour. In the artificial induction, the best season may be during the end of May to the first ten days of June, because of the large number of mature eggs were collected from an adult sea cucumber. The number is about 3,000,000 eggs per individual. The normal development was as follows:(1)blastula:(13 hrs after fertilization), (2)gastrula:(19-30 hrs),(3)auricularia:(2-9 days),(4)doliolaria:(15-16 days),(5)pentactula:(18-22 days). When sea cucumber larvae were bred in the condition added Chaetoceros gracilis and commercial tropical fish food (TetraMin禾 baby) at low density (a larva / ml) in filtration sea water, they grew up into juvenile sea cucumbers. In this paper we reported the table of the stages in the normal development of sea cucumber, Stichopus japonicus Selenka under such conditions at 20℃.