Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Survival and Physiological Responses of Red Sea Bream Pagrus major with Decreasing Sea Water Temperature

수온 하강에 따른 참돔, Pagrus major의 생존율 및 생리 반응

  • 신윤경 (국립수산과학원 남동해수산연구소) ;
  • 김영대 (국립수산과학원 남동해수산연구소) ;
  • 김원진 (국립수산과학원 남동해수산연구소)
  • Received : 2018.08.31
  • Accepted : 2018.09.29
  • Published : 2018.09.30
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Abstract

Decrease in seawater temperature during winter is one of the most important and serious issues confronted by fish net-cage aquaculture farms. This can become the cause of the manifestation of diseases and ensuing mass mortality. The present study was conducted to assess the survival rate, the range of limited low-temperature, the response of oxidative stress in the blood of red sea bream Pagrus major with decrease of water temperature. Low-lethal temperature for 7 days of P. major ($7day-LT_{50}$) was $6.54^{\circ}C$ (confidence limit: $6.31{\sim}6.71^{\circ}C$). Oxygen consumption rate was decreased with lower temperature. It showed the minimum value at the range of low-lethal temperature. Osmolality at $5^{\circ}C$ and $6^{\circ}C$ experimental group was higher significantly than control group. SOD (superoxide dismutase) activity was increased significantly at $5^{\circ}C$ experimental group compared to control group. This study data will be used to determine the appropriate area for aquaculture of red sea bream. It also manage fish net-cage farm to cope with the mass mortality occurring frequently during winter season.

겨울철 수온의 변동으로 우리나라 남해안 연안에 위치하고 있는 어류가두리 양식장에서 관리하고 있는 어류의 폐사가 빈번하게 발생하고 있다. 본 연구는 온대성 어류인 참돔을 대상으로 저수온 하한내성 범위 및 수온 하강에 따른 호흡률, 암모니아질소 배설률과 혈액내 산화스트레스 반응을 조사하였다. 참돔의 하한내성수온은 $6.54^{\circ}C$(95% 신뢰한계: $6.31{\sim}6.76^{\circ}C$)였다. 산소소비율은 수온 하강에 따라 감소하였으며, 하한수온에서 최저치를 나타내었다. 혈액 내 삼투질농도는 수온 $5^{\circ}C$와 $6^{\circ}C$에서 대조구에 비해 유의한 증가를 나타내었다. 혈액 내 SOD는 모든 실험구 가운데 수온 $5^{\circ}C$에서 유의하게 활성 증가가 나타났다. 본 연구의 결과는 참돔을 양식할 수 있는 지역선정 및 겨울철 발생하는 동계 폐사원인 규명을 위한 자료로도 유용하게 활용될 수 있을 것이다.

Keywords

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