사육밀도가 강도다리(Platichthys stellatus) 치어의 성장, 사료이용성 및 체조성에 미치는 영향

Abstract

Abstract This study evaluated the effects of stocking density on growth, feed utilization and body composition of juvenile starry flounder (Platichthys stellatus). Starry flounder juvenile were reared at five stocking densities [ratio of body surface area to tank bottom area: 3, 2, 1, 1/2 and 1/3]. At the end of 80 days feeding trial, survival of juvenile starry flounder reared at various density conditions was ≥ 89% and there was no significant difference among all experimental groups. Weight gain of fish at the 3 group was significantly lower than that of fish at the 1 group. Specific growth rate of fish at the 3 groups was significantly lower than that of fish at the 1/3, 1/2 and 1 groups, but not significantly differ from that of fish at the 2 group. Feed consumption of fish at the 1/3 group was significantly lower than that of fish at the 2 and 3 groups, whereas the 1/2 and 1 groups were not showed significantly different. Feed efficiency of fish at the 1 group was significantly higher than that of fish at the 2 and 3 groups, but not significantly differ from that of fish at the 1/3 and 1/2 groups. Hepatosomatic index of fish at the 1/3 group was significantly higher than that of fish at the 2 and 3 groups, whereas the 1/2 and 1 groups were not showed significantly different. Based on these results, the optimum stocking density for juvenile starry flounder (6.7 g/fish) is a ratio of body surface area to bottom area tank of 1.