Temporal changes in European eel, Anguilla anguilla, stocks in a small catchment after installation of fish passes

Changes in the abundance of European eel, Anguilla anguilla L., in the River Fre´mur, France, were examined over an 8-year period. Natural connectivity of the river was disturbed by three high dams that inhibited eel upstream migration and reduced recruitment by elvers and yellow eels. After eel pas...

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Bibliographic Details
Published in:Fisheries Management and Ecology
Main Authors: Laffaille, Pascal, Acou, Anthony, Guillouët, Jérôme, Legault, Antoine
Other Authors: Museum National d'Histoire Naturelle - MNHN (FRANCE), Fish-Pass (FRANCE), Université de Rennes 1 (FRANCE)
Format: Article in Journal/Newspaper
Language:English
Published: Blackwell Publishing 2005
Subjects:
Biodiversité
Ecosystèmes
Abundance
Anguilla Eel passes
Recruitment
Anguilla anguilla
Online Access:http://oatao.univ-toulouse.fr/6195/
http://oatao.univ-toulouse.fr/6195/1/Laffaille_6195.pdf
https://doi.org/10.1111/j.1365-2400.2004.00433.x
Description
Summary:Changes in the abundance of European eel, Anguilla anguilla L., in the River Fre´mur, France, were examined over an 8-year period. Natural connectivity of the river was disturbed by three high dams that inhibited eel upstream migration and reduced recruitment by elvers and yellow eels. After eel passes were installed, fish became more abundant upstream (mean density 0.5 eel m)2). Moreover, except in the more upstream areas, no decline in eel numbers and biomass was found, in contrast to the general decline of eel throughout its distribution range. It was concluded that eel passes are important to conserve and/or to recover eel stocks.

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