Assessing the efficiency of an elver ladder using a multi‐state mark–recapture model
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Published source details
Drouineau H., Rigaud C., Laharanne A., Fabre R., Alric A. & Baran P. (2015) Assessing the efficiency of an elver ladder using a multi‐state mark–recapture model. River Research and Applications, 31, 291-300.
Published source details Drouineau H., Rigaud C., Laharanne A., Fabre R., Alric A. & Baran P. (2015) Assessing the efficiency of an elver ladder using a multi‐state mark–recapture model. River Research and Applications, 31, 291-300.
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 2009–2010 in a river in France (Drouineau et al. 2015) found that an elver ladder at a gate was used by up to two-thirds of tagged young European eels Anguilla anguilla to travel upstream. During nine tagging events, 11–61% of tagged eels were recaptured after climbing an elver ladder to travel upstream. Recapture rates were greatest when the river level was high (data reported as statistical model results). The brush ladder (6-m long, 45° angle) was installed in 2008. On nine days in May–June 2009 and 2010, young eels (342–551 eels/day, 51–245 mm long) collected in a trap at the installed elver ladder were tagged, monitored for 24 h, and released at three locations downstream of the gate (in front of the ladder, or 50 m downstream by either the left or right bank). A trap at the top collected all eels climbing the ladder. For 15 days after each release, tagged eels were collected from the trap every 2–3 days.
(Summarised by: Anna Berthinussen)
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