Abstract
1. 1. Carp were cannulated in the dorsal aorta and the changes in arterial blood gas were examined during 30 min CO 2 anesthesia under differing conditions and during the subsequent 60 min recovery period. The mean PaCO 2, PaO 2, and pHa of the carp ( n = 50) before anesthesia were 3, 63, and 7.78 mmHg, respectively. 2. 2. All of the carp became anesthetized to Stage II (initial stage of anesthesia) or higher when treated with water containing high concentrations of CO 2 (more than pCO 2 = 125 mmHg), while only one carp out often reached Stage II at PwCO 2 = 100 mmHg. The mean induction time of anesthesia (Stage II) was 23 ( n = 1), 20, 12, and 8 min at PwCO 2 = 100,125,175, and 250 mmHg, respectively. At Stage II, the mean PaCO 2, PaO 2, and pHa were 88–146 mmHg, 181–262mmHg, and 6.61–6.66, respectively. 3. 3. At recovery, the mean PaCO 2, PaO 2, and pHa were 15–31, 63–175 and 6.95–7.20 mmHg, respectively, the mean recovery time being 8–22 min.
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