The surface water in the middle of the Yangtze River had strong biology toxicity to fish. It's the main reason that gas supersaturation has the character which the D. O concentration increases roughly.
7．三峡大坝泄流，坝下长江中游部分江段表层水对鱼类具有很强的生物毒性，调查表明江水气体过饱和是主要致死原因。
参考来源 - 三峡水库蓄水运行前后坝下重要渔业水域生态环境的调查分析·2,447,543篇论文数据，部分数据来源于NoteExpress
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