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Journal of Experimental Biology 57,673-680 (1972)
Published by Company of Biologists 1972

The Effect of Increased Ambient CO₂ on Arterial CO₂ Tension, CO₂ Content and pH in Rainbow Trout

JAMES N. CAMERON ¹ and DAVID J. RANDALL ¹

¹ Institute of Arctic Biology, University of Alaska, College Alaska 99701, Department of Zoology, University of British Columbia Vancouver 8, B.C., Canada

1. The effect of exposure of rainbow trout to high and low levels of environmental (water) CO₂ tension on blood CO₂ and pH was studied.

2. An increase in environmental CO₂ caused a rise in the arterial CO₂ tension (Pa_CO2), but the blood-to-water gradient (P_IPa) remained about the same.

3. Changes in arterial pH were small - about one-third of what would be predicted from the change in Pa_CO2, if plasma bicarbonate remained constant.

4. There was a corresponding increase in the total CO₂ content of the blood which involved an upward shift of the CO₂ dissociation curve, and readjustment of the buffering to maintain pH.

5. The results are consistent with the hypothesis that blood CO₂ and pH levels are regulated via a chloride-bicarbonate exchange mechanism, rather than by ventilation and diffusive washout of gaseous CO₂.

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