Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Effect of Dietary Protein and Lipid Levels on the Growth and Body Composition of Juvenile Long Snout Bullhead Leiocassis longirostris Gunther

배합사료의 단백질 및 지질 함량이 종어(Leiocassis longirostris Gunther) 치어의 성장과 체성분에 미치는 효과

  • Lim, Sang Gu (Inland Aquaculture Research Center, National Fisheries Research & Development Institute) ;
  • Han, Hyoung Kyun (Inland Aquaculture Research Center, National Fisheries Research & Development Institute) ;
  • Bang, In Chul (Department of Life Science and Biotechnology, Soonchunhyang University) ;
  • Choi, Jin (Department of Marine Bioscience and Technology, Gangneung-Wonju National University) ;
  • Lee, Sang-Min (Department of Marine Bioscience and Technology, Gangneung-Wonju National University)
  • 임상구 (국립수산과학원 내수면양식연구센터) ;
  • 한형균 (국립수산과학원 내수면양식연구센터) ;
  • 방인철 (순천향대학교 생명시스템학과) ;
  • 최진 (강릉원주대학교 해양생물공학과) ;
  • 이상민 (강릉원주대학교 해양생물공학과)
  • Received : 2013.04.24
  • Accepted : 2013.07.22
  • Published : 2013.08.31
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Abstract

We ran a feeding trial to determine optimal dietary protein and lipid levels for growth of juvenile long snout bullhead Leiocassis longirostris Gunther. Eight experimental diets (P20L7, P20L14, P30L7, P30L14, P40L7, P40L14, P50L7 and P50L14) were formulated to contain 20%, 30%, 40% or 50% protein combined with either 7% or 14% lipid. Three replicate groups of fish (mean mass: 3.9 g/fish) were fed one of the experimental diets ad libitum for 8 weeks. Survival of fish fed the P20L14 diet was lower than that of fish fed the P40L14, P50L7 and P50L14 diets. Growth of fish fed diets containing 7% lipid increased with increasing protein level (up to 50% protein); growth of fish fed diets containing 14% lipid increased with increasing protein level (up to 30% protein). The feed efficiency of fish fed a diet with 50% protein and 7% lipid was higher than that of other groups. Whole body moisture and lipid contents were affected by dietary lipid level but not by dietary protein level. The crude lipid contents of fish fed 14% lipid diets were higher than those fed 7% lipid diets across all protein levels (other than the 50% level). Thus, under our experimental conditions, an increase in dietary protein level improved growth and feed efficiency of fish; a diet containing 50% protein with 7% lipid was optimal for growth and effective feed utilization in juvenile long snout bullhead.

Keywords

References

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