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Effect of Size Grading on Growth, Feed Efficiency and Survival in Olive Flounder (Paralichthys olivaceus)  

Kim, Jong-Hyun (Fish Genetics and Breeding Research Center, National Fisheries Research and Development Institute)
Kim, Hyun-Chul (Fish Genetics and Breeding Research Center, National Fisheries Research and Development Institute)
Lee, Jeong-Ho (Fish Genetics and Breeding Research Center, National Fisheries Research and Development Institute)
Noh, Jae-Koo (Fish Genetics and Breeding Research Center, National Fisheries Research and Development Institute)
Lee, Mi-Sug (Fish Genetics and Breeding Research Center, National Fisheries Research and Development Institute)
Kim, Kyung-Kil (Fish Genetics and Breeding Research Center, National Fisheries Research and Development Institute)
Publication Information
Journal of Aquaculture / v.18, no.3, 2005 , pp. 154-159 More about this Journal
Abstract
This study was conducted to evaluate the effects of size grading on growth, feed efficiency and survival of juvenile olive flounder. Juvenile flounder were divided into four groups by initial average size; Small group $(1.3{\pm}0.23g)$, medium group $(3.1{\pm}0.45g)$, large group $(4.9{\pm}0.57g)$ and ungraded group $(3.3{\pm}1.66g)$. Triplicate groups of 100 fish were reared over 8 weeks. In final body weight distribution, frequency of the small size flounder (10 g) was markedly higher in the ungraded group than in the small group. Specific growth rate, feed efficiency and survival in the ungraded group were significantly lower (P<0.05) than those in the pooled data of the othor three graded groups, although feed intake in the ungraded group was significantly higher (P<0.05) than that of the pooled data of the other three graded groups. These results show that the small flounder gained significantly faster growth and higher survival in the absence of the large flounder. Therefore, size grading seems to be an important and necessary operation to improve the growth and survival of juvenile olive flounder (1-5 g).
Keywords
Paralichthys olivaceus; Size grading; Growth; Feed efficiency; Survival;
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