Evaluation of a Nature-like Bypass for Non-Salmonids in the Sesan River

Author:

Sun Junjian12,Yu Fuqiang1,Zhang Qi1ORCID,Luo Shujing1,Zhou Wu1,Zhang Hui1,Tan Junjun2,Shi Xiaotao2,Shen Yinting2,Shi Jiayue13

Affiliation:

1. Power China Huadong Engineering Corporation Limited, Hangzhou 311122, China

2. College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China

3. Huadong Eco-Environmental Engineering Research Institute of Zhejiang Province, Hangzhou 311122, China

Abstract

In recent years, the hydropower development of the lower Mekong River has accelerated, accompanied by habitat loss and fragmentation. We conducted two experiments using video recordings and traps to evaluate the effectiveness of a nature-like rock ramp bypass in the Sesan River in 2019 and 2021. The results show that the fishway provides both upstream and downstream passage for at least 24 non-salmonid species of fish. The vast majority of fish choose to ascend from July to September, especially in August, and hardly between October and November. The fish inside the fishway prefer to move during the daytime (6:00–18:00), especially during August and September. An excessive water depth at the entrance can lower the number of ascending fish, whereas a higher water depth at the exit can cause the opposite result. Nevertheless, the size of fish monitored exhibits a decreasing trend, suggesting the nature-like bypass cannot completely mitigate the impact caused by this impassable Sesan Ⅱ dam. Therefore, a quantitative assessment of the bypass is highly encouraged, whereas the selection of the tracked fish species and experimental period requires considerable deliberation. This study alleviates the dilemma of insufficient fishway evaluation in tropical countries, which can provide researchers with data support on future non-salmonid fishway designs.

Funder

PowerChina Huadong Engineering Corporation Limited

National Natural Science Foundation of China

Open Research Fund of Hubei International Science and Technology Cooperation Base of Fish Passage

Publisher

MDPI AG

Subject

Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry

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