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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국수산과학회 양식분과 한국양식학회지 한국양식학회지 제11권 제2호
발행연도
1998.5
수록면
173 - 182 (10page)

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The study has been conducted to understand gonadal development and the effects of 17α-methyltestosterone on sex inversion of the red spotted grouper, Epinephelus akaara. Fish were collected from Deukyang bay in the southern coast of Korea in August, 1996 and then they had been cultivated at the indoor tank until August, 1997. Gonad somatic index (GSI) in the females of both treated and control group began to increase from February when water temperature was raised again, and reached the maximum value in August, whereas it had decreased from September and thereafter maintained relatively low value until January. Unlike females, GSI in the male or intersex of treated groups decreased after June. Hepatosomatic index (HSI) of the control group tended to show the relatively low around Autumn, whereas it showed relatively higher value in April and June when the ovary was in the growing stage. Although the treated groups showed relatively higher value of the HSI than the control, the patterns in monthly variation of HSI were similar to the control. Sexual change of the female grouper to the male was attempted by acceleration with oral administration of 17α-methyltestosterone at the dose of 0.2 and 0.5 ㎎/㎏ fish for 120 days. Transitional hermaphroditic gonads were observed from the various size of groupers ranging 21.0 to 36.1 ㎝ in total length, while the functional males could be induced from the individuals of 28.8 to 33.5 ㎝ in total length. This result indicated that larger groupers than 30 ㎝ in total length should be used for sex inversion to maleness with 17α-methyltestosterone.

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