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The Study on Mechanism of Sex Determination in the Pacific Oyster, Crassostrea gigas

Research Project

Project/Area Number 04660195
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field General fisheries
Research InstitutionTohoku University

Principal Investigator

MATSUTANI Takeshige  Tohoku Univ. Fac. of Agr., Associate Prof., 農学部, 助教授 (90134030)

Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsCrassostrea gigas / Triploid / Gametogenesis / Sex / Glycogen / Estradiol-17 beta / 染色体 / 性分化
Research Abstract

1. In triploid oysters, Crassostrea gigas, which had been cultured in Mangoku-Ura Inlet, Miyagi Prefecture, hermaphrodites were observed at a higher percentage than in diploids during reproductive period. The hermaphroditism was thought to result from sex reversal, male to female, which occurred just after spawning.
2. There were a few triploids of which gills contained both diploid and triploid cells.
3. Glycogen contents and glycogen synthetase activity in the gonad of triploids was higher than those of diploids during the reproductive period.
4. Estradiol-17 beta levels in the gonad of triploids was not different significantly from that of the diploids during the reproductive period.
Estradiol-17 beta has been reported to function as a female sex hormone in the Pacific oysters. Therefore the facts mentioned ablve (1, 3 and 4) suggests that other than genetical factors, nutritional levels, not hormonal levels, may affect determination of sex expression in the gonad of the Pacific oysters.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report

URL: 

Published: 1992-04-01   Modified: 2016-04-21  

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