Understanding fish and eel behaviour to improve protection and passage at river structures: extended summary – SC120061
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Published source details
Piper A. & Wright R. (2017) Understanding fish and eel behaviour to improve protection and passage at river structures: extended summary – SC120061. Environment Agency report, 9-11.
Published source details Piper A. & Wright R. (2017) Understanding fish and eel behaviour to improve protection and passage at river structures: extended summary – SC120061. Environment Agency report, 9-11.
Actions
This study is summarised as evidence for the following.
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Install baffled fish passes Action Link |
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Install fish passes (type not specified) Action Link |
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Install baffled fish passes
A study in 2013–2015 in a river in Suffolk, UK (Piper & Wright 2017; same experimental set-up as Piper et al. 2018) reported that a baffled ‘Larinier’ fish pass and two ‘trough-type’ elver passes were used by European yellow eels Anguilla anguilla to bypass a hydroelectric power turbine when migrating upstream. Results are not based on tests of statistical significance. Fifty of 56 tagged yellow eels (89%) that approached the hydropower station passed through the fish passes to travel upstream (separate results not reported for fish pass type). Most adult (yellow and silver) eels (82%, number not reported) migrating downstream passed by a lock instead of the fish passes (percentage/number not reported). Of eels that approached the passes, the average delay before passing was 1.8 hours. In March 2013 to March 2014, yellow eels were captured, tagged, and released either upstream (74 eels) or downstream (216 eels) of a hydroelectric power turbine in a river. In addition, 127 actively migrating silver eels were captured, tagged and released upstream in autumn 2013 and 2014. Antennas were installed to monitor eel movements through a baffled ‘Larinier’ fish pass (see Piper et al. 2018 for details) and two ‘trough-type’ elver passes (details not provided).
(Summarised by: Vanessa Cutts)
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Install fish passes (type not specified)
A study in 2013–2015 in a river in Suffolk, UK (Piper & Wright 2017) reported that two unspecified fish passes, along with a baffled ‘Larinier’ fish pass, were used by European yellow eels Anguilla anguilla to bypass a hydroelectric power turbine when migrating upstream but rarely downstream. Results are not based on tests of statistical significance. Fifty of 56 tagged yellow eels (89%) that approached the hydropower station passed through the fish passes (separate results not reported for fish pass type). Most adult (yellow and silver) eels (82%, number not reported) migrating downstream passed by a lock instead of the fish passes (percentage/number not reported). Of eels that approached the passes, the average delay before passing was 1.8 hours. In March 2013 to March 2014, yellow eels were captured, tagged, and released either upstream (74 eels) or downstream (216 eels) of a hydroelectric power turbine in the River Stour. In addition, 127 actively migrating silver eels were captured, tagged and released upstream in autumn 2013 and 2014. Antennas were installed to monitor eel movements through two unspecified (referred to as ‘trough-type’ elver passes) and one baffled ‘Larinier’ fish pass.
(Summarised by: Vanessa Cutts)
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