Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Optimal Salinity and Temperature Conditions for the Growth of the Ultra-small Rotifer Synchaeta kitina

초소형 Rotifer Synchaeta kitina의 성장을 위한 최적 염분 및 수온 조건

  • Park, Jin-Chul (Faculty of Marine Bioscience & Technology, Kangnung National University) ;
  • Park, Heum-Gi (Faculty of Marine Bioscience & Technology, Kangnung National University)
  • 박진철 (강릉대학교 해양생명공학부) ;
  • 박흠기 (강릉대학교 해양생명공학부)
  • Published : 2008.05.25
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Abstract

We investigated the optimum salinity and temperature conditions for mass culture of ultra-small rotifer Synchaeta kitina. In the salinity experiment of ranging within 5 and 30 psu, the population growth of S. kitina increased continuously up to 20 psu, and then decreased over 20 psu. Their maximum density showed 390.1 inds./mL at 5 psu. A pre-reproductive phase was shortened in low salinity than high salinity. Also, the maximum offsprings and maximum lifespan and lifespan of the female were 13.4 inds. and 5.9 days, respctively at 5 psu. In the temperature experiments of ranging within 16 and $32^{\circ}C$, the population growth of S. kitina increased continuously up to $24^{\circ}C$, and then decreased over $24^{\circ}C$. The highest maximum density showed 492.8 inds./mL at $16^{\circ}C$. Their offsprings increased significantly with temperature decrease, and the maximum number of offsprings per female was 9.2 females. at $16^{\circ}C$. Their lifespan increased with temperatures decrease and the longest lifespan was to 5.5 days at $16^{\circ}C$. From these results, we conclude that the optimum culture conditions of S. kitina is 5 psu and $16^{\circ}C$.

본 연구는 입이 작은 어류들의 초기 먹이생물로 이용 가능성이 있는 초소형 rotifer Synchaeta kitina의 대량배양을 위한 최적 염분 및 수온을 규명하는데 그 목적이 있다. S. kitina를 대상으로 6개(5, 10, 15, 20, 25 및 30 psu)의 염분구와 5개(16, 20, 24, 28 및 $32^{\circ}C$)의 수온구를 두어 이들의 성장을 비교해 보았다. 이 때 모든 실험은 밀집 및 개체배양으로 나누어 행하였다. 염분 및 수온에 따른 실험결과, 밀집배양 시 최고밀도는 저온, 저염분 일 때 높은 경향을 5 psu, $16^{\circ}C$에서 유의적으로 가장 높게 나타났다. 또한 개체배양을 통한 생식 전 단계, 순 생식 단계, 산란수 및 수명 등의 성장요인들도 저온, 저염분 일수록 유의적으로 높게 나타나는 것으로 조사되었다. 따라서 초소형 rotifer S. kitina의 대량배양을 위한 최적 염분 및 수온 조건은 밀집배양 시 최고밀도를 보이고, 개체배양 시 생식, 평균수명과 같은 성장요인이 유의적으로 높게 나타난 5 psu, $16^{\circ}C$라 판단된다.

Keywords

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