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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 1998.11
- 수록면
- 573 - 580 (8page)
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초록· 키워드
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Red spotted grouper, Epinephelus akaara is distributed in the south and west coasts of Korea. The natural stocks of the fish are decreasing sharply year by year because of reckless overfishing. This research was carried out to understand general informations on maturation, sex composition and sex-reversals of the fish.
Annual fishing yields of red spotted grouper in the coastal area of Byonsan Peninsular of Korea decreased over 10% from 1992 to 1994. The main fishing season was from May to July with fishing gear of Hand-lines. Gonadosomatic index (GSI) and condition factor were highest on early and late July, respectively, thus main spawning period was assumed from late July to early August. The relationship between total length (X) and body weight (Y) for wild adults was represented as a regression, Y=0.0169X^(2.9705), (r²=0.96).
Frequency of sex of wild red spotted gouper showed that the number of female below 38㎝ in total length was more than that of male, and hermaphrodite mainly occurred from 28㎝ to 32㎝. In reared adults, females only occurred below 25㎝, while in the fish ranging from 26 to 32㎝ in total length the frequency of male and female were almost same. Also hermaphrodite occurred mainly between 25~29㎝.
Sex reversal ratio of the adults reared in a tank for a year with different sexual compositions revealed that the frequency of female reversed from male was more than that of male reversed from female at 1 : 1 and 1 : 2 stocking densities of female and male, respectively. Also, about 20% of female was reversed to male when all females were reared. And the size of the fish reversed to male was larger than that of non-reversed female.
Annual fishing yields of red spotted grouper in the coastal area of Byonsan Peninsular of Korea decreased over 10% from 1992 to 1994. The main fishing season was from May to July with fishing gear of Hand-lines. Gonadosomatic index (GSI) and condition factor were highest on early and late July, respectively, thus main spawning period was assumed from late July to early August. The relationship between total length (X) and body weight (Y) for wild adults was represented as a regression, Y=0.0169X^(2.9705), (r²=0.96).
Frequency of sex of wild red spotted gouper showed that the number of female below 38㎝ in total length was more than that of male, and hermaphrodite mainly occurred from 28㎝ to 32㎝. In reared adults, females only occurred below 25㎝, while in the fish ranging from 26 to 32㎝ in total length the frequency of male and female were almost same. Also hermaphrodite occurred mainly between 25~29㎝.
Sex reversal ratio of the adults reared in a tank for a year with different sexual compositions revealed that the frequency of female reversed from male was more than that of male reversed from female at 1 : 1 and 1 : 2 stocking densities of female and male, respectively. Also, about 20% of female was reversed to male when all females were reared. And the size of the fish reversed to male was larger than that of non-reversed female.
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UCI(KEPA) : I410-ECN-0101-2009-529-015347121