The experiment was conducted t determine the effects of water temperature and daily feeding rate on Koran rockfish growth. The first experiment was carried out to know the growth of the fish in the different water temperature. The second experiment was carried out to know the effects of feeding rate of the fish. In the first experiment, feed efficiency was unaffected by the different water temprature 12, 15 and $18^{circ}C$, but feed intake and growth rate were affected by the water temperature. Feed intake and growth rate of the fish reared in $15^{circ}C$ were higher than those of the other groups. In the second experiment, feed efficiency was unaffected by feeding rate except the starve group. Daily growth rate of the fish fed 1.0% diet/BW or more. HSI, VSI, condition factor, GOT, GPT, TG, GL and Ht of fed groups were unaffected by the feeding rate in the experiment. Absoption ratios of protein and lipid were not different with the different feeding rates in fed fish groups. These results indicate that the optimum daily feeding rate of yearling Korean rockfish is about 70-80% of satiation rate.