한국어류학회지 (Korean Journal of Ichthyology)

  • 제28권1호
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  • Pages.1-8
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  • 2016
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  • 1225-8598(pISSN)
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  • 2288-3371(eISSN)
한국어류학회 (The Ichthyological Society of Korea)
권호 표지

저수온 스트레스에 따른 능성어 (Epinephelus septemfasciatus) 혈액의 생리생화학적 반응

Physiological and Biochemical Response of Blood on Low Temperature Stress in Sevenband Grouper, Epinephelus septemfasciatus

  • 박종연 (국립수산과학원 양식관리과) ;
  • 박재민 (경상북도 토속어류산업화센터) ;
  • 홍창기 (남해수산연구소 해역산업과) ;
  • 김경민 (남해수산연구소 해역산업과) ;
  • 조재권 (국립수산과학원 양식관리과)
  • Park, Jong Youn (Aquaculture Management Division, Aquaculture Research Institute, NIFS) ;
  • Park, Jae Min (Gyeong-sangbuk-Do Native Fish Business Center) ;
  • Hong, Chang Gi (Southwest Sea Fisheries Research Institute, NIFS) ;
  • Kim, Kyong Min (Southwest Sea Fisheries Research Institute, NIFS) ;
  • Cho, Jae Kwon (Aquaculture Management Division, Aquaculture Research Institute, NIFS)
  • 투고 : 2016.02.29
  • 심사 : 2016.03.18
  • 발행 : 2016.03.31
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초록

본 연구는 능성어 (Epinephelus septemfasciatus)의 겨울철 저수온으로 발생하는 폐사원인 규명을 위한 생리생화학적인 반응을 조사하기 위하여 수온 $12^{\circ}C$를 대조구로 Exp. I ($-1^{\circ}C/24h$), Exp. II ($-1^{\circ}C/8h$)의 실험구를 정하여 9일간에 걸쳐 생존율, 코티졸, 글루코스, 총단백질 및 전해질 농도를 측정하였다. 생존율은 Exp. I 실험구의 경우 사육수온 $5^{\circ}C$로 하강한 후 170시간째 12마리의 폐사를 시작으로 174시간째에 전 개체 폐사하였다. 반면 Exp. II 실험구의 경우 $5^{\circ}C$로 하강한 후 72시간째 9 마리의 폐사를 시작으로 76시간째 전 개체가 폐사하였다. 생리적 반응은 Exp. I과 Exp. II의 미비한 차이는 있으나 비슷한 경향이 나타났으며, 혈장 코티졸과 글루코스의 대사생리가 $7^{\circ}C$에 급격하고 상승하고, 유영능력과 아가미 개폐운동이 빨라졌다. 이상의 결과로 능성어의 저수온 내성의 임계수온은 $7^{\circ}C$로 추정된다.

This study was conducted to investigate the physiological responses of sevenband grouper, Epinephelus septemfasciatus at low temperature condition in winter season. Water temperature was dropped from $12^{\circ}C$ to $5^{\circ}C$ by two different interval (interval I: $-1^{\circ}C/24h$ and interval II: $-1^{\circ}C/8h$). The experimental fishes were exposed for 9 days at each water temperature condition, and were observed survival rate. The blood sample was collected from fishes for analysis of cortisol, glucose, total protein (TP), and electrolytes ($Na^+$, $Cl^-$, $K^+$). Mortality of fish was not observed until $5^{\circ}C$. The mortality (12 individuals) began after 170 h and all fish were death after 174 h in interval I case, whereas the mortality (9 individuals) began after 72 h and all fish were death after 76 h in interval II case. Little different was observed in the physiological responses, but trend was similar between two intervals. The physiological metabolism of plasma cortisol and glucose were increased rapidly, and swimming ability and respiration response was faster at $7^{\circ}C$. This result means that the critical temperature of sevenband grouper was $7^{\circ}C$ at low water temperature condition.

키워드

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