Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Cardiorespiratory Regulations in the Japanese Amberjack (Seriola quinqueradiata) Exposed to Acute Hypoxia

저산소환경이 방어(Seriola quinqueradiata) 순환계의 산소운반 기능에 미치는 영향

  • LEE Kyoung Seon (Institute for East China Sea Research, Nagasaki University) ;
  • ISHIMATSU Atsushi (Institute for East China Sea Research, Nagasaki University) ;
  • JEON Joong Kyun (Faculty of Marine Bioscience & Technology, Kangnung National University)
  • 이경선 (나가사키대학 환동지나해 해양자원연구센터) ;
  • 이시마츠 아츠시 (나가사키대학 환동지나해 해양자원연구센터) ;
  • 전중균 (강릉대학교 해양생명공학부)
  • Published : 2005.04.01
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Abstract

We studied the cardio-respiratory properties in the Japanese amberjack (Seriola quinqueradiata) during acute hypoxia exposure. Fish were exposed to three levels of hypoxia (80, 60 or 50 mmHg) for 60 min at $25^{\circ}C$. Cardiovascular parameters (cardiac output; Q, heart rate; HR, stroke volume; SV, blood pressure; $P_{DA}$) changed little from pre-exposure values during both 80 and 60 mmHg of hypoxia. During 50 mmHg of hypoxia, the fish showed a bradycardia which significantly affected Q, whereas no change in SV. $P_{DA}$ increased transiently. Arterial oxygen partial pressure ($PaO_2$) immediately reduced along with a decrease of the water oxygen partial pressure ($P_WO_2$). Arterial $O_2$ content ($CaO_2$) decreased significantly only after 60 min of 50 mmHg of hypoxia. Arterial pH (pHa) and hematocrit value (Hct) did not change significantly. Comparing the effects of different levels of hypoxia, oxygen delivery to the tissues ($Q\;{\times}\;CaO_2$) should be maintained a constant over a broad range of $P_WO_2$, however, severely depressed below 50 mmHg of hypoxia.

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References

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