Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Effect of Experimental Diets Containing Krills on the Growth and Body Composition of Juvenile Black Rockfish Sebastes schlegeli

실험사료 중 크릴 첨가가 조피볼락 Sebastes schlegeli 치어의 성장 및 체성분에 미치는 영향

  • Lee, HaeYoung (Aquaculture Industry Division, East Sea Fisheries Institute, NIFS) ;
  • Nam, Myung-Mo (Aquaculture Industry Division, East Sea Fisheries Institute, NIFS)
  • 이해영 (국립수산과학원 동해수산연구소) ;
  • 남명모 (국립수산과학원 동해수산연구소)
  • Received : 2020.03.05
  • Accepted : 2020.06.01
  • Published : 2020.06.30
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Abstract

A feeding experiment was conducted to investigate the effects of replacement of dietary fish meal by frozen whole krill (FWK) and/or krill meal (KM) on growth performance and body composition of juvenile black rockfish, Sebastes schlegeli. The basal experimental diet (ED) contained 58.4% fish meal (FM) as a control, the other five EDs were formulated with the protein replacement ratio of fish meal by as 0, 10, 20, 30, and 40%, respectively (FWKM0, FWK10, FWK20, FWK20KM10, FWK20KM20 and FWK20KM20HP). Each diet was fed to juvenile rockfish initially weighing 3.09±0.02 g/fish in a flow-through system. The control ED containing 58.4% FM and 10% FWK diet showed significantly higher weight gain and feed efficiency than all the other EDs containing 20, 30, and 40% FWK and/or KM. But the survivals, whole-body moistures, crude proteins and lipids of black rockfish fed all EDs were similar in all EDs. The only whole-body ashes of juvenile black rockfish were significantly differentiated by feeding the various EDs containing different levels of FWK and/or KM with a protein and lipid levels adjustment. These results suggest that dietary frozen whole Antarctic krill and/or krill meal inclusions could not improve the growth but change the whole-body ashes in juvenile black rockfish. Therefore, this study further indicates that dietary more than 20% of FWK and/or KM supplementation could not be a potential source of animal protein to replace fishmeal in juvenile black rockfish.

최초 체중 3.09±0.02 g 조피볼락 치어에서 먹이원으로 냉동크릴 (FWK) 그리고 크릴분말 (KM) 첨가량 (0~40%)에 따라 6종 실험사료로 7주간 사육한 결과 최종 체중, 증체율, 사료효율 및 전어체의 일반성분 중 회분에서는 유의적으로 차이가 나타났지만, 생존율과 전어체의 일반성분 중 수분, 조단백질 및 지질에서는 유의적인 차이 없이 유사하였다. 사육실험 후 크릴 첨가 먹이 종류에 따른 최종 체중은 7.4~12.0 g, 증체율은 141~286%로 먹이 종류에 따라서 유의적으로 성장 차이를 나타내었다. 사료효율은 36~72%로 성장처럼 유사한 경향을 보였다. 크릴을 첨가하지 않은 대조구에서는 12.0 g으로 FWK10구에서 9.3 g과 유의적으로 유사한 최종 체중을 나타내어 다른 시험구보다는 높은 최종 체중을 나타내었다. 즉, FWK 20% 이상 및 크릴분말 0%, 10%, 20%구에서는 7.4~7.8 g으로 유의적으로 낮게 나타났다. 냉동크릴구에서 냉동크릴 무첨가구와 유사하거나 냉동크릴 및 크릴분말 함유량에 따라 유의적으로 낮은 전어체 회분 함량을 나타내었다. 또한 FWK20KM20구에서 어분으로 단백질 함량을 높여주어도 성장, 사료효율 및 전어체의 일반성분에서 차이가 나지 않았다. 이상의 결과로 조피볼락 치어 사료에 냉동크릴 및 크릴분말 10~40% 첨가 시 성장, 사료효율 및 생존율 향상에 효과가 없었다. 그러나 냉동크릴만 10% 첨가 시에는 어분만을 첨가한 사료와 유사한 양호한 성장, 사료효율 및 생존율을 나타내었다.

Keywords

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