Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Field observations of the lethality characteristics of endangered and endemic fish under the stress of total dissolved gas supersaturation
https://orcid.org/0000-0002-1542-2738
https://orcid.org/0000-0002-2286-1528
AbstractTotal 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 davidiandLeptobotia 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.
Field observations of the lethality characteristics of endangered and endemic fish under the stress of total dissolved gas supersaturation
https://orcid.org/0000-0002-1542-2738
https://orcid.org/0000-0002-2286-1528
AbstractTotal 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 davidiandLeptobotia 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.
Field observations of the lethality characteristics of endangered and endemic fish under the stress of total dissolved gas supersaturation
https://orcid.org/0000-0002-1542-2738
https://orcid.org/0000-0002-2286-1528
AbstractTotal 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 davidiandLeptobotia 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.
Field observations of the lethality characteristics of endangered and endemic fish under the stress of total dissolved gas supersaturation
River Research & Apps
Yuan, Quan (Autor:in) / Wang, Yuanming (Autor:in) / Liang, Ruifeng (Autor:in) / Feng, Jingjie (Autor:in) / Li, Yong (Autor:in) / An, Ruidong (Autor:in) / Li, Kefeng (Autor:in)
River Research and Applications ; 37 ; 1156-1167
01.10.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Field observation of total dissolved gas supersaturation downstream of Ertan high dam
| British Library Conference Proceedings | 2009