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Article

Fish Passage and Injury Risk at a Surface Bypass of a Small-Scale Hydropower Plant

Aquatic Systems Biology Unit, Department of Ecology and Ecosystem Management, Technical University of Munich, Mühlenweg 22, 85354 Freising, Germany
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Sustainability 2019, 11(21), 6037; https://doi.org/10.3390/su11216037
Received: 14 October 2019 / Revised: 28 October 2019 / Accepted: 29 October 2019 / Published: 30 October 2019
(This article belongs to the Special Issue Hydropower Impacts on Aquatic Biota)
In contrast to the efforts made to develop functioning fishways for upstream migrants, the need for effective downstream migration facilities has long been underestimated. The challenge of developing well-performing bypasses for downstream migrants involves attracting the fish to the entrance and transporting them quickly and unharmed into the tailrace. In this study, the acceptance of different opening sizes of a surface bypass as well as the injuries which fish experience during the passage were examined. Overall bypass acceptance was low compared to the turbine passage. There was no significant difference in the number of downstream moving fish between the small and the large bypass openings. Across all fish species, no immediate mortality was detected. Severe injuries such as amputations or bruises were only rarely detected and at low intensity. Scale losses, tears and hemorrhages in the fins and dermal lesions at the body were the most common injuries, and significant species-specific differences were detected. To increase bypass efficiency, it would likely be useful to offer an alternative bottom bypass in addition to the existing surface bypass. The bypass injury potential could be further reduced by structural improvements at the bypass, such as covering protruding components. View Full-Text
Keywords: fishway; migration; downstream passage; conservation; hydroelectric dam; moveable hydropower plant; monitoring fishway; migration; downstream passage; conservation; hydroelectric dam; moveable hydropower plant; monitoring
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MDPI and ACS Style

Knott, J.; Mueller, M.; Pander, J.; Geist, J. Fish Passage and Injury Risk at a Surface Bypass of a Small-Scale Hydropower Plant. Sustainability 2019, 11, 6037. https://doi.org/10.3390/su11216037

AMA Style

Knott J, Mueller M, Pander J, Geist J. Fish Passage and Injury Risk at a Surface Bypass of a Small-Scale Hydropower Plant. Sustainability. 2019; 11(21):6037. https://doi.org/10.3390/su11216037

Chicago/Turabian Style

Knott, Josef, Melanie Mueller, Joachim Pander, and Juergen Geist. 2019. "Fish Passage and Injury Risk at a Surface Bypass of a Small-Scale Hydropower Plant" Sustainability 11, no. 21: 6037. https://doi.org/10.3390/su11216037

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