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

International audience 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 an...

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Bibliographic Details
Published in:Fisheries Management and Ecology
Main Authors: Laffaille, Pascal, Acou, Anthony, Guillouët, Jérôme, Legault, Antoine
Other Authors: Biodiversité fonctionnelle et gestion des territoires, Université de Rennes (UR), Fish Pass
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2005
Subjects:
Abundance
Anguilla Eel passes
Recruitment
[SDV.BID]Life Sciences [q-bio]/Biodiversity
[SDV.EE.ECO]Life Sciences [q-bio]/Ecology
environment/Ecosystems
Anguilla anguilla
Online Access:https://hal.science/hal-00793407
https://hal.science/hal-00793407/document
https://hal.science/hal-00793407/file/Laffaille_6195.pdf
https://doi.org/10.1111/j.1365-2400.2004.00433.x
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Summary:International audience 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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