Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Effects of Water Temperature, Photoperiod and Population Density on Oxygen Consumption in the Longtooth Groper Epinephelus bruneus

수온, 광조건 및 밀도에 따른 자바리(Epinephelus bruneus)의 산소소비 특성

  • Yang, Sang Geun (Future Aquaculture Research Center, National Fisheries Research & Development Institute) ;
  • Ji, Seung Cheol (Future Aquaculture Research Center, National Fisheries Research & Development Institute) ;
  • Moon, Tae Seok (Future Aquaculture Research Center, National Fisheries Research & Development Institute) ;
  • Kim, Kyung Min (Future Aquaculture Research Center, National Fisheries Research & Development Institute) ;
  • Jeong, Min Hwan (Aquaculture Management Division, National Fisheries Research & Development Institute)
  • 양상근 (국립수산과학원 미래양식연구센터) ;
  • 지승철 (국립수산과학원 미래양식연구센터) ;
  • 문태석 (국립수산과학원 미래양식연구센터) ;
  • 김경민 (국립수산과학원 미래양식연구센터) ;
  • 정민환 (국립수산과학원 양식관리과)
  • Received : 2012.10.17
  • Accepted : 2013.03.25
  • Published : 2013.04.30
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Abstract

This study investigated the effects of water temperature, photoperiod and population density on oxygen consumption (OC) in the longtooth grouper (Epinephelus bruneus). OC rate in the longtooth grouper at 15, 20, and $25^{\circ}C$ were $85.9{\pm}6.9$, $107.5{\pm}10.1$, and $164.0{\pm}19.2\;mg\;O_2\;kg^{-1}\;h^{-1}$, respectively, indicating a linear increase in OC with water temperature. Photoperiod was regulated in accordance with the light (09:00-21:00 h, L) and dark (21:00-09:00 h, D) phases of the diel cycle (12L/12D), with a water temperature of 15, 20, or $25^{\circ}C$. OC rates during the light and dark phases were $83.8{\pm}5.4$, $88.1{\pm}7.8\;mg\;O_2\;kg^{-1}\;h^{-1}$, respectively, at $15^{\circ}C$ and $111.2{\pm}12.3$ and $103.7{\pm}5.7\;mg\;O_2\;kg^{-1}\;h^{-1}$ at $20^{\circ}C$. No significant differences were observed between the light and dark phases (P > 0.05). at $25^{\circ}C$ the OC rates were $168.8{\pm}24.3$ and $159.2{\pm}11.4\;mg\;O_2\;kg^{-1}\;h^{-1}$ during the light and dark phases, respectively, indicating that OC is higher during daylight than nighttime. OC tates at 55.4, 88.4, 118.8, and 145.1 g $L^{-1}$ were $252.0{\pm}11.6$, $219.0{\pm}8.7$, $206.7{\pm}11.4$, and $208.8{\pm}11.4\;mg\;O_2\;kg^{-1}\;h^{-1}$, respectively, indicating a decrease in OC with increasing population density. However, no significant difference was observed between the values for 118.8 g $L^{-1}$ and 145.1 g $L^{-1}$ (P > 0.05).

Keywords

References

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