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Species composition and temporal pattern of fish passing through the navigation locks in the middle reach of Yangtze River: implications for fish conservation

Species composition and temporal pattern of fish passing through the navigation locks in the... Introduction While great attention has been given to fishway design to mitigate the environmental effects of dams (Castro‐Santos et al., ; Roscoe and Hinch, ), few studies have addressed the effectiveness of ship locks for fish migration. The role of ship locks for fish passage is usually ignored or merely underestimated as a potential alternative to fishways and is in need of investigation (Larinier and Marmulla, ). The Gezhouba Dam (GD) and the Three Gorges Dam (TGD) are the only dams in the main channel of the middle reach of the Yangtze River. They have no fish pass facilities and thus totally block fish migration (Wei et al., ; Gao et al., ). However, commercial catch data indicated that the compositions of the fish assemblages above and below the dams were of considerable similarities (IHB, ). Hydroacoustic surveys also showed that fish aggregated around the gates of the ship locks (Lin et al., ). These observations suggest that the ship locks might contribute to some connectivity among fish communities upstream and downstream of the dams (Argent and Kimmel, ). The aim of this study was therefore to: quantify the role of ship locks in fish transfer through the http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Ichthyology Wiley

Species composition and temporal pattern of fish passing through the navigation locks in the middle reach of Yangtze River: implications for fish conservation

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References (19)

Publisher
Wiley
Copyright
Copyright © 2013 Blackwell Verlag GmbH
ISSN
0175-8659
eISSN
1439-0426
DOI
10.1111/jai.12362
Publisher site
See Article on Publisher Site

Abstract

Introduction While great attention has been given to fishway design to mitigate the environmental effects of dams (Castro‐Santos et al., ; Roscoe and Hinch, ), few studies have addressed the effectiveness of ship locks for fish migration. The role of ship locks for fish passage is usually ignored or merely underestimated as a potential alternative to fishways and is in need of investigation (Larinier and Marmulla, ). The Gezhouba Dam (GD) and the Three Gorges Dam (TGD) are the only dams in the main channel of the middle reach of the Yangtze River. They have no fish pass facilities and thus totally block fish migration (Wei et al., ; Gao et al., ). However, commercial catch data indicated that the compositions of the fish assemblages above and below the dams were of considerable similarities (IHB, ). Hydroacoustic surveys also showed that fish aggregated around the gates of the ship locks (Lin et al., ). These observations suggest that the ship locks might contribute to some connectivity among fish communities upstream and downstream of the dams (Argent and Kimmel, ). The aim of this study was therefore to: quantify the role of ship locks in fish transfer through the

Journal

Journal of Applied Ichthyology – Wiley

Published: Dec 1, 2013

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