Impact of TDG supersaturation on native fish species under different hydropower flood discharge programs

Yuan, Yuan; Qi, Wei; Yuan, Quan; Wang, Yuanming; Liang, Ruifeng; Li, Kefeng; Zhu, David Z.

doi:10.1016/j.aquatox.2021.105898

Cited by 18 publications

(8 citation statements)

References 34 publications

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“…A similar negative linear correlation between grass carp swimming ability and TDG levels was also reported (Cao et al, 2021). In the in situ experiment of Yuan et al (2021), the U crit of Prenant's schizothoracin and elongate loach (Leptobotia elongata) decreased significantly after flooding (the average TDG levels were 114.3% in July). Our results…”

Section: Combined Effects Of Tdg and Ss On The Swimming Abilities Of ...supporting

confidence: 73%

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Interactive effects of total dissolved gas supersaturation and suspended sediment on the swimming abilities of two fish species

Zhang,

Liu,

Shi

et al. 2023

Ecology of Freshwater Fish

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Discharged floods containing a large amount of suspended sediment (SS) can lead to total dissolved gas (TDG) supersaturation downstream of dams. The swimming ability of fish may be affected by TDG supersaturation and excessive SS. However, previous studies focused only on the separate effects of TDG and SS, ignoring their combined effects. In this study, juvenile rock carp and grass carp were selected to assess the interactive effects of TDG and SS on fish swimming ability. A totally crossed two‐factorial design (six TDG levels: 100%, 115%, 120%, 125%, 130% and 135%; four SS concentrations: 0, 50, 100 and 150 mg/L) was set, and the critical swimming speed (Ucrit) and the burst swimming speed (Uburst) were measured. The findings indicated that the swimming abilities (Ucrit and Uburst) of both fish species decreased with increasing TDG levels and SS concentrations. Separate exposure to TDG significantly decreased the swimming abilities of the two fish species, whereas separate exposure to SS decreased only the swimming abilities of juvenile grass carp. Juvenile rock carp exhibited weaker swimming abilities than juvenile grass carp in TDG‐supersaturated water. Additionally, the interaction between TDG and SS reduced the swimming abilities of juvenile rock carp and grass carp compared with a separate effect, but this reduction was significant only for the Ucrit of juvenile grass carp. This study demonstrates that TDG‐supersaturated water containing SS during flooding may result in fish failure through fishways.

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Section: Combined Effects Of Tdg and Ss On The Swimming Abilities Of ...supporting

confidence: 73%

“…In the in situ experiment of Yuan et al. (2021), the U crit of Prenant's schizothoracin and elongate loach ( Leptobotia elongata ) decreased significantly after flooding (the average TDG levels were 114.3% in July). Our results were consistent with the above findings.…”

Section: Discussionmentioning

confidence: 94%

Interactive effects of total dissolved gas supersaturation and suspended sediment on the swimming abilities of two fish species

Zhang,

Liu,

Shi

et al. 2023

Ecology of Freshwater Fish

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“…This may be related to the low TDG level (116%) in addition to the effect of compensation depth. In addition, one possible reason for this finding is that the exposure time of 96 h at the low TDG level was not long enough to cause high mortality in the fish [ 28 , 35 , 36 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of Total Dissolved Gas Supersaturation on the Survival of Juvenile Procypris rabaudi and Juvenile Myxocyprinus asiaticus at Varying Water Depth in a Natural River

Liu

Cao

et al. 2021

Animals

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Total dissolved gas (TDG) supersaturation, which can be caused by flood discharge, results in gas bubble disease (GBD) in fish and threatens their survival downstream of dams. TDG supersaturation has become a serious environmental problem in the Yangtze River. Few studies have evaluated the effect of TDG supersaturation on fish in natural rivers during periods of flood discharge. To estimate fish tolerance to TDG supersaturation under natural conditions, juvenile Myxocyprinus asiaticus and juvenile Procypris rabaudi were exposed to TDG-supersaturated water for 96 h at various depths (0–0.3 m, 0.3–1.3 m, 1.3–2.3 m and 0–2.3 m) during periods of flood discharge of Dagangshan hydropower station. The results showed that juvenile Procypris rabaudi and juvenile Myxocyprinus asiaticus exhibited obvious GBD signs. An increase in exposure time decreased survival probability of the two species. Deeper water depths can increase the tolerance of juvenile Procypris rabaudi to TDG supersaturation in natural rivers during periods of flood discharge while it cannot improve the survival of juvenile Myxocyprinus asiaticus. Compared with juvenile Myxocyprinus asiaticus, juvenile Procypris rabaudi showed weaker tolerance of TDG supersaturation in shallow water, and juvenile Procypris rabaudi were more vulnerable to TDG supersaturation than juvenile Myxocyprinus asiaticus even if the TDG level (116%) was low.

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“…Bleeding may also appear in tissues of gills, fins, muscles, gonads, and intestinal epithelium (Meyers et al., 2008). These symptoms may impose potential damage on fish, such as tissue necrosis, abnormal growth (Geist et al., 2013), decreased immunity (Schisler et al., 2000), reduced swimming ability (Y. Wang et al., 2017), increased risk of predation and increased buoyancy (Shrimpton et al., 1990a, 1990b), as well as changes in physiological characteristics (Yuan et al., 2021).…”

Section: River Damming Impacts On Fish Physical Habitatmentioning

confidence: 99%

River Damming Impacts on Fish Habitat and Associated Conservation Measures

Chen,

Li,

Lin

et al. 2023

Reviews of Geophysics

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River damming has brought great benefits to flood mitigation, energy and food production, and will continue to play a significant role in global energy supply, particularly in Asia, Africa, and South America. However, dams have extensively altered global river dynamics, including riverine connectivity, hydrological, thermal, sediment and solute regimes, and the channel morphology. These alterations have detrimental effects on the quality and quantity of fish habitat and associated impacts on aquatic life. Indeed, dams have been implicated in the decline of numerous fishes, emphasizing the need for effective conservation measures. Here, we present a global synthesis of critical issues concerning the impacts of river damming on physical fish habitats, with a particular focus on key fish species across continents. We also consider current fish conservation measures and their applicability in different contexts. Finally, we identify future research needs. The information presented herein will help support sustainable dam operation under the constraints of future climate change and human needs.

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Impact of TDG supersaturation on native fish species under different hydropower flood discharge programs

Cited by 18 publications

References 34 publications

Interactive effects of total dissolved gas supersaturation and suspended sediment on the swimming abilities of two fish species

Interactive effects of total dissolved gas supersaturation and suspended sediment on the swimming abilities of two fish species

Effects of Total Dissolved Gas Supersaturation on the Survival of Juvenile Procypris rabaudi and Juvenile Myxocyprinus asiaticus at Varying Water Depth in a Natural River

River Damming Impacts on Fish Habitat and Associated Conservation Measures

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