Climbing the ladder: an evaluation of three different anguillid eel climbing substrata and placement of upstream passage solutions at migration barriers
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Published source details
Watz J., Nilsson P.A., Degerman E., Tamario C. & Calles O. (2019) Climbing the ladder: an evaluation of three different anguillid eel climbing substrata and placement of upstream passage solutions at migration barriers. Animal Conservation, 22, 452-462.
Published source details Watz J., Nilsson P.A., Degerman E., Tamario C. & Calles O. (2019) Climbing the ladder: an evaluation of three different anguillid eel climbing substrata and placement of upstream passage solutions at migration barriers. Animal Conservation, 22, 452-462.
Actions
This study is summarised as evidence for the following.
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Install climbing structures for fish Action Link |
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Install climbing structures for fish
A study in 2017 in a river in Laholm, Sweden (Watz et al. 2019) found that more juvenile European eels Anguilla anguilla used upstream ramps with a studded surface than an open weave or bristle surface, and in slow than fast flowing water. More eels were caught using a ramp with a studded surface (2 eels/night) compared to ramps with an open weave (0.9 eels/night) or a bristle surface (0.4 eels/night). There was no significant difference between the number of eels using open weave or bristle surfaced ramps. More eels were caught on all ramps when they were placed in slow flowing water (1.7 eels/night) compared to fast flowing water (0.5 eels/night). Six ramps attached to floating devices were placed in a channel carrying water away from a hydropower plant (‘tailrace’) in the River Lagan. Three ramps were placed at each side of the channel, 1–2 m from the bank (0, 30 and 60 m downstream of the hydropower plant). Each ramp consisted of three aluminium lanes (2 m long, 32 cm wide), each with a studded, open weave or bristle wetted surface (see paper for details). Water flow was fast on one side and slow on the other side of the channel. Eels were caught in buckets at the end of the ladders for five nights in July 2017.
(Summarised by: Vanessa Cutts)
Output references
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