Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Effects of Dietary Probiotics Supplementation on Juvenile Korean Rockfish Sebastes schlegeli

치어기 조피볼락 Sebastes schlegeli 사료내 생균제 첨가효과

  • Lee, Seung-Hyung (Department of Aquaculture/Feeds and Foods Nutrition Research Center, Pukyong National University) ;
  • Yoo, Gwang-Yeol (Fishery Research Center) ;
  • Choi, Se-Min (Aquafeed Research Center, East Sea Fisheries Research Institute, National Fisheries Research and Development Institute) ;
  • Kim, Kang-Woong (Aquafeed Research Center, East Sea Fisheries Research Institute, National Fisheries Research and Development Institute) ;
  • Kang, Yong-Jin (Aquafeed Research Center, East Sea Fisheries Research Institute, National Fisheries Research and Development Institute) ;
  • Bai, Sung-Chul C. (Department of Aquaculture/Feeds and Foods Nutrition Research Center, Pukyong National University)
  • 이승형 (부경대학교 양식학과) ;
  • 유광열 (충남 수산연구소) ;
  • 최세민 (국립수산과학원 양식사료연구센터) ;
  • 김강웅 (국립수산과학원 양식사료연구센터) ;
  • 강용진 (국립수산과학원 양식사료연구센터) ;
  • 배승철 (부경대학교 양식학과)
  • Published : 2008.05.25
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Abstract

A 12-week feeding trial was conducted to investigate the effects of dietary supplementation of probiotics as a feed additive for juvenile Korean rockfish Sebastes schlegeli. Four experimental diets supplemented with no probiotic(Control), Bacillus polyfermenticus(BP), Bacillus licheniformis(BL) or Bacillus polyfermenticus plus Saccharomyces cerevisiae(BP+SC) at $1.0{\times}10^7$ CFU/kg diet as a dry-mater(DM) basis were prepared by mixing with a basal diet. After 12 weeks of the feeding trial, fish fed BP+SC diet showed significantly higher weight gain(WG), feed efficiency(FE), specific growth rate(SGR) and protein efficiency ratio(PER) than those of fish fed control diet(P<0.05), however there were no significant differences in WG, FE, SGR and PER among fish fed the BP, BL and BP+SC diets. Fish fed BP and BP+SC diets showed significantly higher condition factor(CF) than that of fish fed control and BL diets. Fish fed BP, BL, BP+SC diets showed significantly higher hepatosomatic index(HSI) than that of fish fed control diet, however there was no significant difference in HSI among fish fed BP, BL and BP+SC diets. Fish fed BP+SC diet showed significantly lower serum glucose than that of fish fed control diet, however there was no significant difference in serum glucose among fish fed BP, BL and BP+SC diets. Fish fed BP+SC diet showed significantly higher respiratory burst activity(NBT assay) than that of the fish fed control and BL diets, however there was no significant difference in NBT assay between fish fed BP and BP+SC diets. Fish fed BP and BL diets showed significantly higher lysozyme activity than that of the fish fed control diet, however there was no significant difference in lysozyme activity among fish fed BP, BL and BP+SC diets. Fish fed BP and BP+SC diets showed significantly lower cumulative mortality than that of the fish fed control diet, however there was no significant difference in cumulative mortality among fish fed BP, BL and BP+SC diets after the challenge test. From these results, dietary B. polyfermenticus, B. licheniformis and B. polyfermenticus plus S. cerevisiae supplementation in juvenile Korean rockfish diet could enhance growth performances, non-speicific immunities and a higher resistance against the specific pathogen.

본 연구는 치어기 조피볼락 Sebastes schlegeli 사료내 생균제 첨가가 넙치의 성장 및 면역반응에 미치는 영향을 평가하였다. 실험사료는 주 단백질원으로 북양어분(white fish meal), 콘글루텐밀(corn gluten meal), 탈피대두박(dehulled soybean meal)을 사용하였으며, 탄수화물원으로는 밀가루(wheat flour)를, 지질원으로는 고도불포화지방산(n-3 HUFA)이 다량 함유된 오징어간유(squid liver oil)를 사용하였다. 생균제의 첨가효과를 확인하기 위하여 B. polyfermenticus(BP), Bacillus licheniformis(BL) 및 복합종균(B. polyfermenticus+Saccharomyces cerevisiae; BP+SC)을 실험사료 내에 각각 $1.0{\times}10^7$ CFU/kg diet 수준으로 첨가하였다. 2주간의 예비사육 후, 평균무게 $12.0{\pm}0.1g(mean{\pm}SD)$인 조피볼락을 500 L 원형수조에 각 실험구 당 각각 20마리씩 3반복으로 무작위로 배치하였고, 실험사료는 1일 2회 어체중의 $1.7{\pm}0.6%$(오전 10시, 오후 4시)씩 12주간 공급 하였다. 증체율, 사료효율, 일간성장율 및 단백질 전환효율에 있어서 BP+SC를 공급한 실험구가 대조구(control)에 비하여 유의하게 높게 나타났지만(P<0.05), BP, BL 및 BP+SC를 공급한 실험구간에는 유의한 차이가 나타나지 않았다. 생존율에 있어서는 모든 실험구간에 있어 유의한 차이가 나타나지 않았다. 전어체 지방함량에 있어서 대조구가 다른 모든 실험구에 비해 높게 나타났으며, 전어체 단백질, 회분 및 수분함량에 있어서는 모든실험구간에 유의한 차이가 없었다. 혈액분석에 있어서 혈장내 glucose의 함량은 BP+SC를 공급한 실험구가 대조구에 비해 유의적으로 낮게 나타났으나, BP, BL 및 BP+SC를 공급한 실험구간에는 유의적인 차이가 나타나지 않았다. Respiratory burst activity(NBT assay)에 있어서 BP+SC와 BL을 공급한 실험구가 대조구에 비해 유의적으로 낮게 나타났으며, BP, BL 및 BP+SC를 공급한 실험구간에는 유의적인 차이가 나타나지 않았다. 혈청의 lysozyme 활성에 있어서는 BP와 BL을 공급한 실험구가 대조구에 비해 높게 나타났으며, BP, BL 및 BP+SC를 공급한 실험구간에는 유의적인 차이가 나타나지 않았다. 공격실험 결과, 폐사는 Edwardsiella tarda를 접종한지 1일 후부터 시작하여 11일째 종료 하였다. 생균제를 투여한 모든 실험구가 대조구에 비해 초기폐사율이 낮게 나타났다. 공격실험 후 8일째부터 종료시 까지는 BP+SC를 공급한 실험구가 대조구에 비해 유의적으로 낮게 나타났으며, BP, BL및 BP+SC를 공급한 실험구간에는 유의한 차이가 나타나지 않았다. 상기 결과를 토대로, 조피볼락 사료내 B. polyfermenticus, B. licheniformis 및 B. polyfermenticus 와 S. cerevisiae의 혼합첨가는 조피볼락의 성장 및 사료효율 증진과 항산화능 및 특정질병저항성에 좋은 효과를 나타낼 수 있을 것으로 사료된다.

Keywords

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