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http://dx.doi.org/10.5657/kfas.2004.37.3.197

Effect of Size Grading on Growth and Sex Ratio of Parrot Fish (Oplegnathus fasciatus)  

KIM Jong Hyun (Fish Genetics and Breeding Research Center, National Fisheries Research and Development Institute)
BANG In Chul (Department of Marine Biotechnology, Soonchunhyang University)
CHO Jae Kwon (South Sea Fisheries Research institute, National Fisheries Research and Development Institute)
BAEK Jae Min (South Sea Fisheries Research institute, National Fisheries Research and Development Institute)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.37, no.3, 2004 , pp. 197-201 More about this Journal
Abstract
Juveniles of parrot fish (Oplegnathus fasciatus) were graded and divided into three groups (mean initial size): Small group $(32.9\pm3.2\;g),$ Large group $(130.1\pm12.3\;g)$ and Ungraded group $(74.8\pm29.8\;g).$ Growth and sex ratio were monitored over 3 years. It was concluded that no production advantage was gained by weight grading. There were no differences when the pooled data from the two graded groups were compared with the ungraded group, although mean weight and survival of the large group were continuously higher than those of other groups until the end of rearing period. The highest percentage of males was found in the large group. These results show that males start growing faster than females long before the size grading.
Keywords
Oplegnathus fasciatus; Size grading; Growth; Survival; Sex ratio;
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