SEASONAL CHANGES IN CO2 SENSITIVITY AND BLOOD CIRCULATION IN CERTAIN FRESH-WATER FISHES

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Abstract
The asphyxiation level of oxygen at various levels of CO2 (CO2 sensitivity), measured on the brown bullhead, southern channel catfish, and largemouth bass decreased as the water warmed up with the approach of summer conditions in Florida. In the same general period blood pressure of the bass and channel catfish fell with seasonal change from winter to summer temperatures. Correlated changes were found in the weight of the ventricle with occluded blood. In the channel catfish, ventricle weights were lowest when water temperatures were warmest. They were greatest in winter in Florida and Tennessee fish when temperatures were lowest. Small seasonal trends in stroke output were also observed.

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