Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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The Influence of Water Temperature and Body Weight on Metabolic Rate of Olive Flounder Paralichthys olivaceus

넙치 Paralichthys olivaceus 대사율에 미치는 수온과 체중의 영향

  • 오승용 (한국해양연구원 해양생물자원연구부) ;
  • 장요순 (한국해양연구원 동해분원) ;
  • 박흥식 (한국해양연구원 한.남태평양해양연구센터) ;
  • 최영웅 (한국해양연구원 한.남태평양해양연구센터) ;
  • 김종관 (한국해양연구원 해양생물자원연구부)
  • Received : 2011.11.17
  • Accepted : 2012.01.30
  • Published : 2012.03.30
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Abstract

The effect of water temperature and body weight on oxygen consumption by the fasted olive flounder Paralichthys olivaceus was investigated in order to assess the metabolic rate of this species under different conditions. The oxygen consumption rate (OCR) was measured at three different water temperatures (15, 20 and $25^{\circ}C$) and two different body weights [$9.1{\pm}1.2$ g (mean${\pm}$SD) for the juvenile group and $266.4{\pm}29.3$ g for the immature group] at an interval of 5 minutes for 24 hours using a closed flow-through respirometer. For each treatment condition, three replicates were set up and 135 fish in the juvenile group and 18 fish in the immature group were used. The OCRs exhibited a linear increase described by OCR=-82.06+28.30T ($r^2$=0.96, p<0.001) in the juvenile group and OCR=-52.52+14.73T ($r^2$=0.97, p<0.001) in the immature group. The OCRs decreased with increasing body weights at a given water temperature (p<0.001). The metabolic rate was related to the body weight of the fish as a power function with a weight exponent of between 0.77 and 0.82. $Q_{10}$ values ranged 1.67~2.28 when the temperature was between 15 and $20^{\circ}C$, 1.57~1.93 when the temperature was between 20 and $250^{\circ}C$, and 1.79~1.89 when the temperature was between 15 and $250^{\circ}C$. The energy expenditure by respiration increased with increasing water temperature and decreasing body weight (p<0.001). The mean energy loss rates at 15, 20 and $25^{\circ}C$ were 115.9, 149.8 and 208.2 kJ $kg^{-1}d^{-1}$ in the juvenile groups and 53.8, 81.2 and 101.9 kJ $kg^{-1}d^{-1}$ in the immature groups.

Keywords

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