The dissolved gas supersaturation in the Xiangjiaba reservoir generated from the flood discharge had effects on the fish in the water .The blood gas analysis was studied in Myxocyprinus asiaticus in the natural water of dissolved gas su-peraturation .The results were as follows: in moderate poisoning group ( the fish exposed to dissolved gas superaturation water for two hours), the level of bicarbonate (AB), standard bicarbonate (SB) and total carbon dioxide (TCO2) in the fish blood decreased significantly .The base excess of blood (BEb) and the base excess of extracellular fluid (BEecf) neg-ative increased significantly.The pH value, partial pressure of oxygen (pO2), partial pressure of carbon dioxide (pCO2) and oxygen saturation (SO2) all decreased.The half saturation oxygen partial pressure (P50) increased significantly.In the severe intoxication group ( the fish exposed to dissolved gas saturation water for four hours ) , the levels of AB , SB, TCO2 , pH, SO2 decreased significantly .While the negative value of BEb and BEecf increased significantly .And the val-ue of pO2 and pCO2 ascended.P50 rose significantly.The fish exposed to the dissolved gas supersaturation water suffered from the acidosis .%针对向家坝库区溶解性气体过饱和对鱼类的影响，开展溶解性气体过饱和自然水域中胭脂鱼（ Myxocyprinus asiaticus）的血气酸碱平衡的分析研究。结果表明，中度染毒组血液（暴露于溶解气体饱和水体2 h）碳酸氢根浓度（AB）、标准碳酸氢盐浓度（SB）、二氧化碳含量（TCO2）水平显著下降，全血碱超（BEb）、细胞外液碱超（BEecf）负值显著增加， pH、氧分压（ pO2）、二氧化碳分压（ pCO2）、血氧饱和度（ SO2）均下降，半饱和度氧分压（ p50）显著升高；重度染毒组（暴露于溶解气体饱和水体4 h） AB、 SB、 TCO2、 pH、 SO2均显著下降， BEb、 BEecf负值均显著增加， pO2、 pCO2均升高， p50显著升高；溶解气体过饱和水体引起胭脂鱼发生酸中毒。
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