Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Optimum Feeding Rate for Sub-adult Olive Flounder (384 g) Paralichthys olivaceus Fed Practical Extruded Pellets at Optimum Water Temperatures (20-24.5℃)

적수온(20-24.5℃)에서 사육한 미성어기(384 g) 넙치(Paralichthys olivaceus)의 배합사료 적정 공급률

  • Kim, Sung-Sam (Aquafeed Research Center, National Fisheries Research and Development Institute) ;
  • Kim, Kang-Woong (Aquafeed Research Center, National Fisheries Research and Development Institute) ;
  • Kim, Kyoung-Duck (Aquafeed Research Center, National Fisheries Research and Development Institute) ;
  • Lee, Bong-Joo (Aquafeed Research Center, National Fisheries Research and Development Institute) ;
  • Han, Hyon-Sob (Aquafeed Research Center, National Fisheries Research and Development Institute) ;
  • Kim, Jae-Won (Department of Marine Life-Science, Gangwon Provincial college) ;
  • Bai, Sungchul C. (Department of Marine Bio-Materials and Aquaculture, Pukyong National University) ;
  • Lee, Kyeong-Jun (Department of Marine Life Science, Jeju National University)
  • 김성삼 (국립수산과학원 사료연구센터) ;
  • 김강웅 (국립수산과학원 사료연구센터) ;
  • 김경덕 (국립수산과학원 사료연구센터) ;
  • 이봉주 (국립수산과학원 사료연구센터) ;
  • 한현섭 (국립수산과학원 사료연구센터) ;
  • 김재원 (강원도립대학교 해양생명과학과) ;
  • 배승철 (부경대학교 해양바이오신소재학과) ;
  • 이경준 (제주대학교 해양생명과학과)
  • Received : 2014.08.13
  • Accepted : 2014.09.19
  • Published : 2014.10.31
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Abstract

We investigated the effects of feeding rate on the growth, blood components, and histology of sub-adult olive flounder Paralichthys olivaceus. Optimum feeding rate (initial fish mean weight : $384.2{\pm}5.91g$) was determined under the optimum water temperature. Two replicated groups of fish were fed a commercial diet at rates of 0%, 0.3%, 0.5%, and 0.7% body weight (BW) per day, and to satiation. The feeding trial was conducted using a flow-through system with ten 1.2-metric ton aquaria receiving filtered seawater at $20-24.5^{\circ}C$ 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 significantly lower in the unfed fish than in those fed the experimental diet at all feeding rates. There were no significant differences 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 to satiation. 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 rate of olive flounder weighing 384 g was 0.74% BW per day at the optimum water temperatures.

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References

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