Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Effects of Water Temperature and Photoperiod on the Oxygen Consumption Rate of Fasted Juvenile Parrot Fish, Oplegnathus fasciatus

돌돔, Oplegnathus fasciatus 치어의 절식시 산소 소비율에 미치는 수온과 광주기의 영향

  • 오승용 (한국해양연구원 해양자원연구본부) ;
  • 노충환 (한국해양연구원 해양자원연구본부) ;
  • 강래선 (한국해양연구원 해양자원연구본부) ;
  • 명정구 (한국해양연구원 해양자원연구본부)
  • Published : 2006.12.31
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Abstract

The effect of water temperature and photoperiod on the oxygen consumption of the fasted juvenile parrot fish, Oplegnathus fasciatus was investigated to provide empirical data for the early-stage culture management and bioenergetic growth model of the species. The mean body weight of the juvenile used for the experiment was $21.5{\pm}1.9g$, and the oxygen consumption rate was measured under four water temperatures (10, 15, 20 and $25^{\circ}C$) and three photoperiods (24L:0D, 12L:12D and OL:24D) with an interval of 5 minutes for 24 hours using a continuous flow-through respirometer. In each treatment three replicates were set up and 15 juveniles were totally involved. The oxygen consumption rates increased with increasing water temperature under all photoperiod treatments (P<0.001). Mean oxygen consumption rates at 10, 15, 20 and $25^{\circ}C$ ranged $202.1{\sim}403.4,\;306.7{\sim}502.2,\;536.7{\sim}791.0\;and\;879.9{\sim}1,077.4mg\;O_2\;kg^{-1}h^{-1}$, respectively. $Q_{10}$ values ranged $1.58{\sim}2.30$ between 10 and $15^{\circ}C,\;2.44{\sim}3.06$ between 15 and $20^{\circ}C\;and\;1.86{\sim}2.6y9$ between 20 and $25^{\circ}C$, respectively. Mean oxygen consumption rates of O. fasciatus were the highest in continuous light (24L:0D) followed by 12L:12D and 0L:24D (P<0.001). The oxygen consumption of fish exposed to the 12L:12D photoperiod was significantly higher during the light phase than during the dark phase under all temperature treatments (P<0.001). In summary, oxygen consumption rates of the juvenile parrot fish increase with increasing water temperature and lengthening daylight period; and, thereby, changes in water quality resulted from the depletion of oxygen under high temperature and long daylight photoperiod conditions should be monitored.

돌돔 치어의 사육 관리 및 생체역학 모델 결정을 위한 기초자료를 수집하기 위해 수온과 광주기에 따른 산소 소 비율을 조사하였다. 절식한 돌돔(평균 무게 $21.5{\pm}1.9g$ 총 180마리) 치어를 대상으로 네 가지 수온(10, 15, 20, $25^{\circ}C$ 세 가지 광주기(24L:0D, 12L:12D, 0L:24D)에 따라 유수식 형태의 호흡실을 이용하여 24시간 동안 5분 간격으로(3반복) 산소 소비율을 측정하였다. 수온과 광주기 그리고 두 인자의 상호작용 모두가 돌돔 치어의 산소 소비율에 유의한 영향을 미쳤다.(P<0.001). 각 광주기 조건에서 수온 상승에 따라 산소 소비율은 유의적으로 증가하였다(P<0.001). 10, 15, 20그리고 $25^{\circ}C$에서의 시간당 평균 산소 소비율은 각각 $202.1{\sim}403.4,\;306.7{\sim}502.2,\;536.7{\sim}791.0$ 그리고 $879.9{\sim}1,077.4mg\;O_2\;kg^{-1}h^{-1}$였으며, $Q_{10}$ 값은 $10{\sim}15,\;15{\sim}20,\;20{\sim}25^{\circ}C$에서 각각 $1.58{\sim}2.30,\;2.44{\sim}3.06,\;1.86{\sim}2.69$이었다. 모든 수온 조건에서 연속 명기(24L:0D)일 때 산소 소비율은 연속 암기(0L:24D)일 때보다 유의하게 높았다(P<0.001). l2L:12D의 명기에서의 산소 소비율은 같은 조건의 암기 때보다 유의하게 높은 산소 소비율을 보였다(P<0.001). 결론적으로, 돌돔 치어 사 육시 고수온 및 긴 낮 시간이 유지될 때 사육수의 산소 결핍 현상에 주의를 기울여야 한다.

Keywords

References

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