River habitat assessment and restoration in high dam flood discharge systems with total dissolved gas supersaturation

Zhang, Peng; Li, Qingyuan; Wang, Yuanming; Zhu, David Z.; Liang, Ruifeng; Qin, Leilei; Li, Ran; Ji, Qianfeng; Li, Kefeng

doi:10.1016/j.watres.2022.118833

Cited by 20 publications

(8 citation statements)

References 69 publications

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“…A succession of high dams exceeding 200 m have been constructed in the upper reaches of the Yangtze River in China. The effects of TDG supersaturation caused by the operation of these dams on downstream fish have become increasingly noticeable [38][39][40]. Most research into in situ TDG effects has been conducted on salmonids, and research into non-salmonid species is slight in comparison [6].…”

Section: Future Studymentioning

confidence: 99%

Tolerance and Growth of Adult Schizothorax prenanti Exposed and Re-Exposed to Supersaturated Gas Downstream of a Dam

Yuan

Wang

et al. 2022

Water

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Total dissolved gas (TDG) is suggested to be one possible explanation for the extensive mortality of endemic fish suffered from gas bubble disease (GBD). We investigated the effects of water depth on adult Schitzothorax prenanti susceptibility to GBD in TDG supersaturated water 11.5 km downstream of Dagangshan dam in a two-year (2016–2017) live cage study. The probability of survival significantly increased at greater depth. The mortality of fish at 1–2 m was reduced to 50% of that at 0–1 m and the mortality rate for fish at 2–3 m was reduced to 25% of that at 0–1 m. Fish that survived in-situ TDG exposure in 2016 were relocated to equilibrated water and observed for 274 d to investigate sublethal effects of GBD. The surviving fish showed a substantial reduction in growth compared to the control group. During the flood discharge period in 2017, fish were re-exposed to TDG supersaturated water after a period of recovery (274 d) in equilibrated water. The mortality rate of re-exposed fish decreased to 35% compared to newly introduced fish. Our results contribute to the protection of aquatic organisms and the improvement of eco-friendly hydroelectric dam operations in the Yangtze River.

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Section: Future Studymentioning

confidence: 99%

Tolerance and Growth of Adult Schizothorax prenanti Exposed and Re-Exposed to Supersaturated Gas Downstream of a Dam

Yuan

Wang

et al. 2022

Water

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“…Reasonable and effective river development projects can bring energy benefits and optimize water resource allocation (Tan et al, 2019). However, the river ecosystem will be greatly impaired due to the construction and operation of these large‐scale river development projects (Benejam et al, 2016; Yuan et al, 2021; Zhang et al, 2022), thereby perhaps affecting fish survival and behaviors in corresponding basins. Although little research has been carried out to investigate the effects of river development projects on fish behaviors, it is necessary to further analyse the inevitable impact of environmental degradation caused by river development projects on fish behaviors.…”

Section: Introductionmentioning

confidence: 99%

Morphology and motor behavior of endemic fishes in the upper reaches of the Yangtze River basin

Liu,

Cao,

et al. 2024

Journal of Fish Biology

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Dam construction alters the hydrodynamic conditions, consequently impacting the swimming behavior of fish. To explore the effect of flow hydrodynamics on fish swimming behavior, five endemic fish species in the upper Yangtze River basin were selected. Through high‐speed video visualization and computer analysis, these species' swimming patterns under different flow velocities (0.1–1.2 m/s) were investigated. The kinematic and morphological characteristics of the fish were presented. The principal component analysis was used to analyse the main factors influencing the swimming ability of fish and to determine the correlation coefficients among fish behavior indicators. Fish exhibited three different swimming patterns under different flow velocities. Low velocity (0.1–0.3 m/s) corresponds to free motion, middle velocity (0.4–0.7 m/s) corresponds to cruising motion, and high velocity corresponds to stress motion (0.8–1.2 m/s). The fish kinematic index curves were obtained, and four of five fish species showed two extreme points, which means the optimal and adverse swimming strategies can be determined. With the increase in flow velocity, the tail‐beat frequency showed an increasing trend, whereas the tail‐beat angle and amplitude showed a decreasing trend. Morphological and kinematic parameters were the two main indexes that affect the swimming ability of fish, which accounts for 41.9% and 26.9%, respectively.

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“…This process can lead to total dissolved gas (TDG) supersaturation in the downstream river due to hydrostatic and dynamic water pressures (Qu et al, 2011a;Fan et al, 2020;Zhang, 2022). TDG supersaturation can extend several kilometers downstream (Huang et al, 2010) and has been observed in the lower reaches of the Clark Fork River in the United States and the Yangtze River system in China (Weitkamp et al, 2003;Ji et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Impact of Short-Term Total Dissolved Gas Supersaturation on Cognitive Functions and Swimming Performance in Medaka (Oryzias latipes)

Liao,

Li,

Yang

et al. 2024

Preprint

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During the flood season, high dam operations for flood discharge result in total dissolved gas (TDG) supersaturation. This condition causes gas bubble trauma (GBT) and can even lead to fish mortality, posing a significant threat to downstream river ecosystems. Assessing the ecological risks of TDG presents a major challenge in water power-intensive river basins worldwide. Limited research has explored the impact of TDG on fish behaviors such as aggression and memory, which are crucial for feeding, reproduction, and predator avoidance. This study investigated the effects of acute TDG supersaturation stress on swimming behavior, aggression, and memory in medaka. Results indicated that Medaka exposed to 115% and 130% TDG supersaturation for 2 hours showed significantly reduced swimming performance. At TDG levels of 100%, 115%, and 130%, medaka displayed activity rates in the mirror arm of 44.34 ± 12.88%, 40.27 ± 15.44%, and 35.35 ± 16.07%, respectively, and in the active stimulus arm of 50.35 ± 14.75%, 40.76 ± 12.51%, and 35.35 ± 18.47%, respectively. As TDG levels increased, both aggression and memory in medaka significantly declined. The findings of this study could contribute to developing a TDG ecological risk assessment model based on fish memory and aggression, providing essential data for ecological management strategies to mitigate the adverse effects of TDG.

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River habitat assessment and restoration in high dam flood discharge systems with total dissolved gas supersaturation

Cited by 20 publications

References 69 publications

Tolerance and Growth of Adult Schizothorax prenanti Exposed and Re-Exposed to Supersaturated Gas Downstream of a Dam

Tolerance and Growth of Adult Schizothorax prenanti Exposed and Re-Exposed to Supersaturated Gas Downstream of a Dam

Morphology and motor behavior of endemic fishes in the upper reaches of the Yangtze River basin

Impact of Short-Term Total Dissolved Gas Supersaturation on Cognitive Functions and Swimming Performance in Medaka (Oryzias latipes)

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