Journal of Fisheries and Marine Sciences Education (수산해양교육연구)

The Korean Society for Fisheries and Marine Sciences Education (한국수산해양교육학회)
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Effect of the Polychaete Antimicrobial Peptide as feed Additives on Olive Flounder and Black Rockfish Immune Activity

넙치 및 조피볼락 면역 활성에 대한 사료첨가제로서 갯지렁이 항균펩타이드의 효과

  • Received : 2016.08.25
  • Accepted : 2016.09.23
  • Published : 2016.12.31
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Abstract

In this study, the effect of the polychaete antimicrobial peptide as feed additives on fish, olive flounder (Paralichythys olivaceus) and black rockfish (Sebastes schlegelii), immune activity was described. The antimicrobial peptide of the polychaete was induced by peptidoglycan from Micrococcus luteus. The fish were fed an experimental diet supplemented with 0%, 0.05%, 0.1%, 0.5% or 1% of immune induced the polychaete to a commercial diet. Haematological parameters, nonspecific immunes and stress were evaluated 2, 4, 6 and 8 weeks during fed. The resistance against bacteria, Edwardsiella tarda and Streptococcus iniae, were analysed on after 8 weeks. The haematological parameters were not significantly changed among tested groups. But the lysozyme activities were significantly high in the 0.1% and 0.5% supplement group of olive flounder and black rockfish, respectively. Additionally, cortisol in plasma was low in the 0.1% and 0.5% supplement group of olive flounder and black rockfish, respectively. And resistance of these supplement groups were significantly induced against bacterial injection.

본 연구에서는 다양한 면역 유도제를 주사하여 갯지렁이의 면역을 유도시킨 후, 갯지렁이의 항균 펩타이드를 가장 많이 발현시킬 수 있는 최적의 면역 유도제를 선정하였으며, 선정된 면역 유도제로 면역을 유도한 갯지렁이를 분말화 하여 사료에 첨가하였을 때 양식 어류의 면역 활성을 증가시킬 수 있는지에 대한 여부를 조사하였다. 넙치와 조피볼락은 면역활성을 위한 갯지렁이 분말의 사료 첨가율이 서로 달랐으며, 넙치의 경우 0.1%의 사료 첨가율이 넙치의 라이소자임 활성, 혈청 내 코르티졸 농도뿐만 아니라 E. tarda에 대한 항병성에 가장 높은 효과를 보였다. 조피볼락은 0.5%의 사료 첨가율이 조피볼락의 라이소자임 활성을 증가시키고 혈청 내 코르티졸 농도를 감소시켰으며 S. iniae에 대한 항병성 또한 증가시켰다. 따라서 넙치와 조피볼락은 각각 면역 유도된 갯지렁이 분말이 0.1%와 0.5% 첨가된 사료를 급이하였을 때 면역 활성을 가장 많이 유도 할 수 있을 것으로 생각되지만, 반면 그 이상의 농도로 면역 유도된 갯지렁이 분말을 사료에 첨가하여 급이할 시 오히려 면역 활성에 부정적인 영향을 미칠 수 있을 것으로 생각된다. 이번 연구에서는 주간 8 갯지렁이 분말 첨가 사료를 급이한 것에 대한 양식 어류의 면역 활성을 검증 하였으며, 추후 연구에서는 갯지렁이 첨가사료의 급이 기간을 고려한 연구가 진행되어야 할 것으로 생각된다.

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