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Seven feeding trials were conducted to determine the effects of feeding rate and frequency in the Korean rockfish S ebastes schlegeli at seven different water temperatures. Two feeding-rate experiments for 5-g Korean rockfish at 17 °C and 20°C; three feeding rate experiments for 16-g Korean rockfish at 16 °C and 24°C; and finally, two feeding frequency experiments for 93- and 100-g at 15°C and 20°C were conducted. Twenty fish averaging 5.5 ± 0.2 g (mean ± SD) were randomly distributed into 18 indoor tanks containing 40-L seawater from a semi-recirculation system. Fish were fed a commercial diet for 4 weeks at water temperatures of 17°C and 20°C. Two feeding trials were conducted to determine the optimum feeding frequency in growing Korean rockfish reared at temperatures of 15°C and 19°C. Broken line regression analysis of weight gain (WG) indicated that the optimum feeding rates of 5-g growing Korean rockfish were 4.48% (BW/day; BW, body weight) at 17 °C and 4.83% (BW/day) at 20°C. Broken line regression analysis of WG showed optimum feeding rates of 16-g juvenile Korean rockfish of 3.41% (BW/day) at 16 °C, 3.75% (BW/ day) at 20°C, and 3.34% (BW/day) at 24°C. The biological performance, results, along with morphological indices and serological characteristics, suggest that a feeding frequency of 1 meal/day was optimal to improve WG in growing Korean rockfish grown from 93 to 133 g at a water temperature of 15°C, and 100 to 132 g at 19°C.

A Review of the Optimum Feeding Rates and Feeding Frequency in Korean Rockfish Sebastes schlegeli Reared at Seven Different Water Temperatures