The application of carbon dioxide anesthesia to fish has been studied in order to find a method of transport of live fish. In the continuation of this study, the levels of arterial PaO
2, PaCO
2 and pH were examined in carp anesthetized with carbon dioxide. In the initial stage of the anesthesia, both PaO
2 and PaCO
2 increased. In the following stage, PaCO
2 gradually decreased. An increase or decrease in PaO
2 seems to depend on the levels of PaCO
2 during anesthesia. On the other hand, ECG (electrocardiogram) profiles of anesthetized carp indicate that a gradual increase in `R-R interval is coupled with a gradual decline of the opercular rate.
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