Blood oxygen levels and acid-base status following air exposure in an air-breathing fish, Channa argus: the role of air ventilation

Comp Biochem Physiol A Comp Physiol. 1983;74(4):787-93. doi: 10.1016/0300-9629(83)90348-1.


1. Acute air exposure of an air-breathing fish Channa argus immediately induced hypercapnic acidemia while total CO2 content of blood remained unchanged. Upon reimmersion, paco2 and pHa quickly restored to pre-exposure levels followed by gradual rise of [HCO-3]. 2. Artificial air ventilation of air-exposed fish restored acid-base status and greatly depressed voluntary air ventilatory movements. We conclude that the major cause of acid-base disturbances occurring during air exposure is the reduced air convection.

MeSH terms

  • Acid-Base Equilibrium*
  • Animals
  • Blood Cell Count
  • Blood Gas Analysis
  • Carbon Dioxide / metabolism
  • Fishes / blood
  • Fishes / metabolism*
  • Oxygen / blood*
  • Respiration*


  • Carbon Dioxide
  • Oxygen