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Ovulation Induction Effect of Sevenband Grouper, Epinephelus septemfasciatus in Size and Abdomen Inflation Degree of Mother Fish  

Cho, Jae Kwon (Aquaculture Management Division, Aquaculture Research Institute, NIFS)
Hong, Chang Gi (Southwest Sea Fisheries Research Institute, NIFS)
Park, Jong Youn (Aquaculture Management Division, Aquaculture Research Institute, NIFS)
Son, Maeng Hyun (Aquatic Disease Control Division, Aquaculture Research Institute, NIFS)
Park, Jae Min (Gyeongsangbuk-Do Native Fish Business Center)
Han, Kyeong Ho (Chonnam National University)
Kim, Kyong Min (Southwest Sea Fisheries Research Institute, NIFS)
Publication Information
Korean Journal of Ichthyology / v.28, no.4, 2016 , pp. 260-266 More about this Journal
Abstract
We determined the morphologic characteristics (body weight and abdomen inflation degree) of the mother fish of sevenband grouper, Epinephelus septemfasciatus producing the healthy eggs. Experimental fish were chosen from the reared fish in the sea cage for 6 years. The fish were divided into four size groups by body weight: 4.0~5.0, 5.0~6.0, and 6.0~7.0 kg and four stages (I~IV) by the abdomen inflation degree. After hormone treatment, we observed the ovulation amount of induced eggs, rate of buoyant, fertilization, embryonic survival, and hatching. Egg and oil globule diameter was measured. In order to observe gonadal development, we calculated gonadosomatic index (GSI) and conducted its historical analysis. The ovulation occurred from all experimental fishes over 5.0 kg. The rate of buoyant, fertilization, and embryonic survival was the highest in 6.0~7.0 kg. Hatching rate was the highest in 5.0~6.0 kg. Stage I and II did not induce ovulation. GSI was $0.31{\pm}0.10%$ in stage I, $0.74{\pm}0.25%$ in stage II, $4.68{\pm}0.40%$ in stage III and $6.86{\pm}0.12%$ in stage IV. The rate of buoyant, fertilization, embryonic survival and hatching was the highest in stage III.
Keywords
Sevenband grouper; egg quality; hormone (LHRHa); GSI; ovulation induction;
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