Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Effects of Water Temperature on Oxygen Consumption in Starry Flounder Platichthys stellatus Reared in Seawater and Freshwater

해수 및 담수사육 강도다리 Platichthys stellatus의 산소소비에 미치는 수온의 영향

  • Jeong, Min-Hwan (Aquaculture Management Division, National Fisheries Research and Development Institute) ;
  • Byun, Soon-Gyu (East Sea Mariculture Research Center, National Fisheries Research and Development Institute) ;
  • Lim, Han-Kyu (Aquaculture Management Division, National Fisheries Research and Development Institute) ;
  • Min, Byung-Hwa (Aquaculture Management Division, National Fisheries Research and Development Institute) ;
  • Kim, Young-Soo (Department of Aquaculture, Pukyong National University) ;
  • Chang, Young-Jin (Department of Aquaculture, Pukyong National University)
  • Received : 2009.04.06
  • Accepted : 2009.09.08
  • Published : 2009.08.31
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Abstract

The effects of water temperature on oxygen consumption (OC) of starry flounder Platichthys stellatus reared in seawater (SW) and freshwater (FW) was performed in closed water-recirculating system containing respiratory chamber. Fish acclimated in separate indoor tanks with SW (nine of fish used, $263.0{\pm}40.4$ g) or FW (nine of fish used, $265.8{\pm}34.8$ g) were sampled. The OC of starry flounder at $15^{\circ}C,\;20^{\circ}C$ and $25^{\circ}C$ were $74.4{\pm}17.0,\;85.9{\pm}15.8,\;98.3{\pm}11.4\;mg\;O_2\;kg^{-1}hr^{-1}$ in SW and $46.7{\pm}12.0,\;63.3{\pm}7.5,\;82.6{\pm}5.3\;mg\;O_2\;kg^{-1}hr^{-1}$ in FW, respectively, showing a linear increase in OC with water temperature. The OC of fish reared in both SW and FW clear diel rhythm, with lower values at daytime and higher values in the night, in accordance with light (09:00~21:00 hr) and dark (21:00~09:00 hr) phases of the diel cycle (12L : 12D) in water temperature at $15^{\circ}C$ and $20^{\circ}C$. However OC of fish reared in both SW and FW showed unclear diel rhythm with light and dark phases of the diel cycle in water temperature at $25^{\circ}C$. Starry flounder reared in FW had higher ventilation rates than those in SW, but SW had higher OC per breath than those in FW.

본 연구는 밀폐식 순환여과 시스템의 호흡측정실내에서 해수 및 담수사육 강도다리의 산소소비에 미치는 수온 영향을 조사하였다. 실험에 사용한 어류는 해수 및 담수에 각각 순화시킨 해수사육 강도다리(9마리, 평균체중 $263.0{\pm}40.4$ g)와 담수사육 강도다리(9마리, 평균체중 $265.8{\pm}34.8$ g)를 사용하였다. 수온 15, 20, $25^{\circ}C$에서 해수사육 강도다리의 산소소비량은 각각 $74.4{\pm}17.0,\;85.9{\pm}15.8,\;98.3{\pm}11.4\;mg\;O_2\;kg^{-1}hr^{-1}$, 담수사육 강도다리는 $46.7{\pm}12.0,\;63.3{\pm}7.5,\;82.6{\pm}5.3\;mg\;O_2\;kg^{-1}hr^{-1}$로 수온 상승 비례하여 증가하였다. 또한 수온 $15^{\circ}C$와 $20^{\circ}C$에서는 명기(09:00~21:00 hr)와 암기(21:00~09:00 hr)로 나누어진 광주기(12L : 12D)의 조건에서 해수 및 담수사육 강도다리 모두 명기에는 산소소비가 적고, 암기에는 산소소비가 많은 뚜렷한 일주리듬을 보였다. 하지만 수온 $25^{\circ}C$에서는 해수 및 담수사육 강도다리 모두 명기와 암기의 뚜렷하지 않은 산소소비 일주리듬을 보였으며, 수온 $20^{\circ}C$ 이상에서는 대사리듬이 흐트러지는 것으로 판단된다. 해수 및 담수사육 강도다리의 호흡률을 비교했을 때 담수사육 강도다리가 해수사육 강도다리보다 높았으나, 산소소비량은 해수사육 강도다리가 많았다.

Keywords

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