적수온(20-24.5℃)에서 사육한 미성어기(384 g) 넙치(Paralichthys olivaceus)의 배합사료 적정 공급률
Optimum Feeding Rate for Sub-adult Olive Flounder (384 g) Paralichthys olivaceus Fed Practical Extruded Pellets at Optimum Water Temperatures (20-24.5°C)
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We investigated the effects of feeding rate on the growth, blood components, and histology of sub-adult olive flounderParalichthys olivaceus. Optimum feeding rate (initial fish mean weight : 384.2±5.91 g ) was determined under theoptimum water temperature. Two replicated groups of fish were fed a commercial diet at rates of 0%, 0.3%, 0.5%, and0.7% body weight (BW) per day, and to satiation. The feeding trial was conducted using a flow-through system withten 1.2-metric ton aquaria receiving filtered seawater at 20-24.5°C for 3 weeks. After the feeding trial, the weight gain(WG) and specific growth rate (SGR) were significantly higher in fish fed at 0.7% BW/day and those fed to satiation(0.9% BW/day) than in fish fed at other feeding rates or in the unfed fish. These parameters were negative and significantlylower in the unfed fish than in those fed the experimental diet at all feeding rates. There were no significantdifferences in WG and SGR among fish fed at 0.3 and 0.5% BW/day and among those fed at 0.7% BW/day and tosatiation. The histological changes in the hepatopancreas, kidney, and anterior intestine of fish fed at 0, 0.5, and 0.9% BW/day did not differ much. Broken-line regression analysis of weight gain showed that the optimum feeding rateof olive flounder weighing 384 g was 0.74% BW per day at the optimum water temperatures.
Abstract
We investigated the effects of feeding rate on the growth, blood components, and histology of sub-adult olive flounderParalichthys olivaceus. Optimum feeding rate (initial fish mean weight : 384.2±5.91 g ) was determined under theoptimum water temperature. Two replicated groups of fish were fed a commercial diet at rates of 0%, 0.3%, 0.5%, and0.7% body weight (BW) per day, and to satiation. The feeding trial was conducted using a flow-through system withten 1.2-metric ton aquaria receiving filtered seawater at 20-24.5°C for 3 weeks. After the feeding trial, the weight gain(WG) and specific growth rate (SGR) were significantly higher in fish fed at 0.7% BW/day and those fed to satiation(0.9% BW/day) than in fish fed at other feeding rates or in the unfed fish. These parameters were negative and significantlylower in the unfed fish than in those fed the experimental diet at all feeding rates. There were no significantdifferences in WG and SGR among fish fed at 0.3 and 0.5% BW/day and among those fed at 0.7% BW/day and tosatiation. The histological changes in the hepatopancreas, kidney, and anterior intestine of fish fed at 0, 0.5, and 0.9% BW/day did not differ much. Broken-line regression analysis of weight gain showed that the optimum feeding rateof olive flounder weighing 384 g was 0.74% BW per day at the optimum water temperatures.
참고문헌 (20)
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