Levels of CO2 in arterial blood of carp under carbon dioxide anesthesia.

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Abstract
The application of CO2 anesthesia to fish was studied to find a method of transport of live fish. Levels of PaO2 [arterial O2 partial pressure], PaCO2 [arterial CO2 partial pressure] and pH were examined in carp anesthetized with CO2. In the initial stage of the anesthesia, both PaO2 and PaCO2 increased. In the following stage, PaCO2 gradually decreased. An increase or decrease in PaO2 apparently depended on the levels of PaCO2 during anesthesia. ECG profiles of anesthetized carp indicated that a gradual increase in R-R interval was coupled with a gradual decline of the opercular rate.

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