배합사료의 크기, 사육밀도 및 용존산소 농도가 넙치(Paralichthys olivaceus)의 성장에 미치는 영향
Effects of Feed Particle Size, Stocking Density, and Dissolved Oxygen Concentration on the Growth of Olive Flounder Paralichthys olivaceus
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초록
We performed three sets of feeding trials to establish the optimal feed size (Exp-I), stocking density (Exp-II), and dissolved oxygen level (DO) (Exp-III) for olive flounder Paralichthys olivaceus. In Exp-1, four replicate groups of fish (53.6±0.9 g) were fed commercial diets with three particle sizes (small, medium, and large). In Exp-II, fish (30.0±0.1 g) were reared at four stocking densities (1.8, 3.5, 5.3, and 7.1 kg/m3). In Exp-III, fish (187±1.48 g) were reared under two different DO levels (2–3 and 6–7 mg/L). In Exp-I, fish fed the large-particle diet gained significantly more weight and had a lower feed conversion ratio than fish fed the small- and medium-particle diets. In Exp-II, fish reared at 1.8 and 3.5 kg/m3 gained slightly more weight and had lower feed conversion ratios than fish reared at 5.3 and 7.1 kg/ m3, although these differences were not significant. In Exp-III, negative effects were observed in the low DO groups. Therefore, under our experimental conditions, the optimal feed particle size, stocking density, and DO level for olive flounder were 9-9.4 mm, 3.5 kg/m3, and 6-7 mg/L, respectively.
Abstract
We performed three sets of feeding trials to establish the optimal feed size (Exp-I), stocking density (Exp-II), and dissolved oxygen level (DO) (Exp-III) for olive flounder Paralichthys olivaceus. In Exp-1, four replicate groups of fish (53.6±0.9 g) were fed commercial diets with three particle sizes (small, medium, and large). In Exp-II, fish (30.0±0.1 g) were reared at four stocking densities (1.8, 3.5, 5.3, and 7.1 kg/m3). In Exp-III, fish (187±1.48 g) were reared under two different DO levels (2–3 and 6–7 mg/L). In Exp-I, fish fed the large-particle diet gained significantly more weight and had a lower feed conversion ratio than fish fed the small- and medium-particle diets. In Exp-II, fish reared at 1.8 and 3.5 kg/m3 gained slightly more weight and had lower feed conversion ratios than fish reared at 5.3 and 7.1 kg/ m3, although these differences were not significant. In Exp-III, negative effects were observed in the low DO groups. Therefore, under our experimental conditions, the optimal feed particle size, stocking density, and DO level for olive flounder were 9-9.4 mm, 3.5 kg/m3, and 6-7 mg/L, respectively.
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