用高、低两种浓度的CO_2交替麻醉的结果: 首先用高浓度的CO_2处理30分钟,然后再用低浓度的处理1小时,交替反复进行,因为在试验4中通入低浓度的CO_2(Pco_2=1000mmHg)处理1.5小时后,一些鱼从麻醉状态复苏。表3总结了试验结果,图2则表明了鲤鱼麻醉阶段的变化。当第一次用高浓度CO_2对鱼处理时,鱼进入第三或更高的 The results of alternating anesthesia with high and low CO 2 were as follows: first treatment with high concentration of CO 2 for 30 minutes and then treatment with low concentration for 1 hour were repeated alternately because low concentration of CO 2 ( Pco_2 = 1000 mmHg) After treatment for 1.5 hours, some fish recovered from anesthesia. Table 3 summarizes the test results, Figure 2 shows the carp anesthesia phase changes. When the fish is first treated with high CO 2, the fish enter the third or higher