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Field observations of the lethality characteristics of endangered and endemic fish under the stress of total dissolved gas supersaturation
River Research and Applications ( IF 2.2 ) Pub Date : 2020-08-04 , DOI: 10.1002/rra.3685
Quan Yuan 1 , Yuanming Wang 1 , Ruifeng Liang 1 , Jingjie Feng 1 , Yong Li 1 , Ruidong An 1 , Kefeng Li 1
Affiliation  

Total dissolved gas supersaturation (TDGS) caused by high dam discharge may threaten the survival of fish downstream. This study investigated the TDGS of Dadu River in the first 3 years (2016–2018) after the operation of Dagangshan hydropower station. The effect of TDGS on endemic fish was also evaluated for the first time in this study. Schizothoracin prenanti, Schizothorax davidi and Leptobotia elongata, which are endangered and endemic species in the Dadu River, were selected to evaluate the adverse effects of supersaturation on fish. We found that the supersaturation level varied from 115% to 127% in 2016, from 111% to 121% in 2017, and from 103% to 112% in 2018. The average water levels in these 3 years were 2.99, 2.34 and 1.14 m, respectively. The mortality of fish was positively correlated with TDGS and negatively correlated with water depth. The mortality of juvenile fish was highest in 2016, and increased TDGS had a greater contribution to fish mortality than the other factors. The highest mortality of adults occurred in 2017, and inadequate water depth was an important factor that caused fish mortality. The lowest mortality of both adults and juveniles occurred in 2018, and gas bubble disease in fish was almost never found. Even at shallow water depths, low TDGS (103%–112%) did not cause fish mortality.

中文翻译:

总溶解气体过饱和胁迫下濒危和特有鱼类致死特性的实地观察

大坝高流量引起的总溶解气体过饱和(TDGS)可能威胁下游鱼类的生存。本研究调查了大岗山水电站运行后前3年(2016-2018年)大渡河的TDGS。本研究还首次评估了 TDGS 对特有鱼类的影响。Schizothoracin prenanti , Schizothorax davidiLeptobotia elongata, 是大渡河濒危和特有的物种, 被用来评估过饱和对鱼类的不利影响。我们发现过饱和度从2016年的115%到127%不等,2017年从111%到121%,2018年从103%到112%。这3年的平均水位分别为2.99、2.34和1.14 m , 分别。鱼类死亡率与TDGS呈正相关,与水深呈负相关。2016年幼鱼死亡率最高,TDGS增加对鱼类死亡率的贡献大于其他因素。成鱼死亡率最高发生在2017年,水深不足是导致鱼类死亡的重要因素。2018 年成鱼和幼鱼死亡率最低,几乎从未发现鱼类气泡病。
更新日期:2020-08-04
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