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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38302

Title: 17alpha-Methyltestosterone induced sex change in the unilateral ovariectomized protogynous orange-spotted grouper
Authors: Yeh, Shinn-Lih;Chu, Yeong-Torng;Kuo, Ching-Ming;Ting, Yun-Yuan;Chang, Ching-Fong
Contributors: 國立臺灣海洋大學:水產養殖學系
Date: 2003
Issue Date: 2016-08-24T06:57:00Z
Publisher: Journal of the Fisheries Society of Taiwan
Abstract: Abstract: The objectives were to investigate the effects of sex change in the unilateral ovariectomized (remained one-side gonad) orange-spotted grouper, Epinephelus coioides by implantation with 17alpha-methyltestosterone (MT, 10 mg/kg body weight). Two-year-old female groupers (n=42) were equally divided into 6 groups: intact+control implant, intact+MT implant, unilateral ovariectomized+control implant, unilateral ovariectomized+MT implant, all-ovariectomized+control implant, and all-ovariectomized+MT implant. One side of gonad and both sides of gonad were surgically removed in the unilateral and all-ovariectomized groupers, respectively. After 60-day implantation, all the MT-implanted fish (100% in either intact gonad or unilateral ovariectomized groups) changed from females to males. During the process of MT-implantation, intact fish changed to males after 15 days (33%), 30 days (67%) as compared to 0% on day 15 and 14% on day 30 in the unilateral ovariectomized fish. Significantly higher gonadosomatic index was detected (P<0.05) in the unilateral ovariectomized+control implant as compared to other groups. MT implant decreased hepatosomatic index as compared to the respective control implanted group. Plasma testosterone (T) concentrations and the ratio of plasma T/estradiol-17beta were correlated to the sex change. No regeneration of gonadal tissue was observed in the ovariectomized fish. It is concluded that MT induced sex change in groupers, E. coicoides with either intact or remained single-side gonad.
Relation: 30(1)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38302
Appears in Collections:[水產養殖學系] 期刊論文

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