Observations of American eels using an upland passage facility and effects of passage on the population structure
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Published source details
Schmidt R.E., O'Reilly C.M. & Miller D. (2009) Observations of American eels using an upland passage facility and effects of passage on the population structure. North American Journal of Fisheries Management, 29, 715-720.
Published source details Schmidt R.E., O'Reilly C.M. & Miller D. (2009) Observations of American eels using an upland passage facility and effects of passage on the population structure. North American Journal of Fisheries Management, 29, 715-720.
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 2006–2007 in an upland river in New York, USA (Schmidt et al. 2009) reported that an eel ladder at a small dam was used by some migrating American eels Anguilla rostrata to move upstream, and most eels were small in size. Overall, 183 eels (7–51 cm long) used the ladder over two years (51–132 eels/year). Most of the eels using the ladder (73–86%) were <20 cm in length. In April–October 2006 and 2007, an eel ladder was installed at a 2-m high dam at a mill. The ladder consisted of an aluminium ramp (1.9 m long, 42 cm wide, 35.7° to the river surface). One side was covered in plastic pegs, and the other with plastic mesh. A flow of water (0.5 l/s) was created on the ladder by a pair of siphons. Water from a collection bucket was piped to the base of the ladder to transfer the odour of captured eels as an attractant. In April–October 2006 and 2007, the collection bucket was checked at least twice weekly. Captured eels were measured and released.
(Summarised by: Anna Berthinussen)
Output references
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