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Journal of Experimental Biology 54,239-254 (1971)
Published by Company of Biologists 1971

Oxygen Uptake and Transport by the Rainbow Trout During Exposure to Carbon Monoxide

GEORGE F. HOLETON ¹

¹ Department of Zoology, University of Bristol

1. Rainbow trout, brown trout and pike were exposed to 5% carbon monoxide which was sufficient to combine with over 90% of their haemoglobin.

2. Trout tested at 10 and 15°C did not survive exposures to carbon monoxide longer than 30 min, but those tested at 5°C survived exposures of up to 3 h. Even at 5°C the trout were weakened and unable to stay upright.

3. The respiratory responses of trout exposed to 5% carbon monoxide at 5°C for 30 min were examined in detail.

4. The trout responded to carbon monoxide with an increase in the flow of blood and water past the gills. As a result the mean partial pressure gradient of oxygen from water to blood across the gill membrane was increased. In spite of these changes oxygen uptake fell by 40%.

5. An increase was observed in heart rate and blood pressure in both the ventral and dorsal aorta of CO-exposed fish.

6. There was a drop in the oxygen diffusing capacity or transfer factor of the gills of CO-exposed trout.

7. Although the fish were rendered anoxic there was no bradycardia, suggesting that this reflex response depends upon either environmental or arterial P_O2 and not upon arterial oxygen content.

8. The observed responses to carbon monoxide may be a result of either anoxia, anoxaemia, reduced pH, or a combination of these factors

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