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ORIGINAL RESEARCH article
Front. Mar. Sci.
Sec. Marine Biology
Volume 12 - 2025 |
doi: 10.3389/fmars.2025.1549115
This article is part of the Research Topic Physiological Processes, Disease Progression, Behavior Change and Population Dynamics of Fish in Response to External Environmental Stresses View all articles
Assessment of total dissolved gas supersaturation stress on passage performance of bighead carp (Hypophthalmichthys nobilis) in vertical slot fishway
Provisionally accepted- 1 China Three Gorges University, Yichang, China
- 2 Xihua University, Chengdu, Sichuan Province, China
- 3 Shanghai Jiao Tong University, Shanghai, Shanghai Municipality, China
- 4 Southwest Jiaotong University, Chengdu, Sichuan Province, China
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 after 2 h of exposure to different levels of TDGS water. The results demonstrated that increased TDGS levels and flow velocities significantly reduced the fish passage efficiency. Specifically, passage success rates reached 61%, 48%, 37%, and 37% at TDGS levels of 100%, 110%, 120%, and 130% respectively, at a flow velocity of 0.2 m/s. At flow velocities of 0.2, 0.25, and 0.3 m/s with 100% TDGS water, success rates were 61%, 53%, and 47%, respectively. Moreover, increased TDGS levels and increased flow velocities notably extended the passage time in the fishway. Both TDGS levels and fishway flow velocities significantly influenced the swimming trajectories of the fish. Preferences for flow velocities were notably affected by the TDGS levels, whereas preferences for turbulent kinetic energy were affected by both the TDGS levels and the velocities of the fishway flow. In this study, an evaluation method was developed to assess the adverse effects of TDGS on fish passage efficiency based on the following critical parameters: passage success rate, time, trajectory, and hydraulic factor preference. This study offers valuable insights for optimizing operations and fishway management to enhance fish protection.
Keywords: TDGS, swimming performance, Passage efficiency, Vertical slot fishway, Bighead carp
Received: 20 Dec 2024; Accepted: 29 Jan 2025.
Copyright: © 2025 Li, Ou, Liao, Shi, Zhu, Yuan and Yang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Yadong Ou, Xihua University, Chengdu, 610039, Sichuan Province, China
Jialin Liao, Xihua University, Chengdu, 610039, Sichuan Province, China
Haoran Shi, Xihua University, Chengdu, 610039, Sichuan Province, China
Quan Yuan, Shanghai Jiao Tong University, Shanghai, 200240, Shanghai Municipality, China
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