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The parrotfi sh Oplegnathus fasciatus is a sub-tropical species that is diffi cult to culture during the winter in South Korea. As a result, a recirculating aquaculture system (RAS) was developed to rear parrotfi sh. This study investigated the effects of stocking density and dissolved oxygen (DO) concentration on the growth and hematology of the par- rotfi sh in the RAS. The experimental stocking densities were 5 (SD05), 10 (SD10), 15 (SD15), and 20 kg/m 3 (SD20) total body weight to tank water volume. As the stocking density increased, the mean weight gain, feed effi ciency, and specifi c growth rate tended to decrease. However, SD10 and SD15 did not differ statistically from SD05 in feed ef- fi ciency (P>0.05). Although better growth was achieved in SD05, SD10 and SD15 appeared to be acceptable, practi- cally and economically, in terms of feed effi ciency. The experimental DO concentration ranges were 3-4 (DO3), 5-6 (DO5), and 7-8 mg/L (DO7). The mean weight gain and survival tended to increase with the DO concentration, but there were no differences among treatments (P>0.05). Although the feed effi ciency did not differ among the treat- ments, the specifi c growth rates and daily feed intake increased with the DO concentration and were the highest in DO7 (P 0.05).

hangug susan haghoi ji/han-guk susan gwahak hoeji

Effects of Stocking Density and Dissolved Oxygen Concentration on the Growth and Hematology of the Parrotfish Oplegnathus fasciatus in a Recirculating Aquaculture System (RAS)