Quan Yuan

• Doctor of Engineering
• Sichuan University

Total dissolved gas supersaturation (TDGS) due to flood or hydropower station discharge adversely affects the swimming performance of migratory fish, thereby reducing passage efficiency. This study assessed the swimming performance of bighead carp in an experimental vertical slot fishway under varied slot flow velocities of 0.2, 0.25, and 0.3 m/s a...

This study investigates the impact of total dissolved gas supersaturation (TDGS) on the swimming capabilities of migratory fish (S. prenanti), a common issue during high dam discharges in flood seasons. We assessed fish exposed to 130% TDGS for 2 hr, focusing on their swimming performance in a controlled environment. In our experiments, control gro...

Although developing large-scale hydropower cascades in the upper Yangtze River effectively improves the hydropower resource utilization, it produces total dissolved gas (TDG) supersaturation. In the flood season, the high level of TDG supersaturation (TDGS) frequently occurs in the downstream of dams, causing migratory fish to suffer from gas bubbl...

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 cag...

Total dissolved gas (TDG) supersaturation caused by the operation of hydropower stations can threaten the survival and swimming performance of fish species. Different modes of hydropower flood discharges (regular vs. intermittent) from the Dagangshan hydropower station in China were studied in July and September 2017 to study the impact of TDG supe...

Total dissolved gas (TDG) supersaturation caused by dam operations can cause fish gas bubble disease (GBD) and even fish kill. Few studies have examined the effects on pelagic species. Here, we examined the tolerance and avoidance characteristics of silver carp (Hypophthalmichthys molitrix), a pelagic fish widely distributed in the Yangtze River b...

For shallow lakes, the water exchange process is a crucial factor that affects lake eutrophication, which can be solved by a water diversion project (WDP). However, the water exchange process in shallow lakes is complex and affected by hydrological characteristics (the water level and inflow stream) and external forcing (the wind field). It is of p...

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 hydro-power station. The effect of TDGS on endemic fish was also evaluated for the first time in this study. Schizotho...

Background Total dissolved gas (TDG) caused by the rapid outflow of water from dams may threaten the survival of fish. However, few studies have assessed the impact of fish size on their tolerance to TDG supersaturation in the Yangtze River. To investigate the influences of fish size on the TDG supersaturation tolerance of fish, juvenile grass carp...

The swimming abilities of Spinibarbus hollandi, Siniperca chuatsi, Siniperca loona, Odontobutis sinensis and Rhinogobius giurinus were tested in this study, including induced swimming speed (Uind), critical swimming speed (Ucrit) and constant acceleration test speed (UCAT). The results showed that the Uind of the experimental fish in the Huishui Ri...

Simple Summary Total dissolved gas (TDG) supersaturation severely threatens the survival of fish downstream of hydraulic structures in the Yangtze River due to flood discharge. However, existing findings mostly demonstrate the effect of TDG on the tolerance of benthic fish in China. Few studies have attached great importance to investigating the im...

In circumstances where total dissolved gas (TDG) levels are variable, the peak TDG and duration are expected to be the dominant drivers of fish survival. Focusing on the peak TDG and duration in natural rivers, a laboratory experiment and field experiments in the upper Yangtze River were conducted with Prenant's Schizothoracin (Schizothorax prenant...

When high dams discharge flows of high velocity, large amount of air will be taken into the water downstream of the dams, and the intense aeration between water and air leads to the generation of total dissolved gas (TDG) supersaturation, which will threats the fishes'survival especially those valuable and rare fishes. Experiments were conducted to...

When high dams discharge high velocity flows, large amount of air was taken into the water downstream of the dams, and the intense aeration between water and air leads to the generation of total dissolved gas (TDG) supersaturation. It gives threatens to the fishes’ survival especially those valuable and rare fishes. Experiments were conducted to me...