Skip to Main content Skip to Navigation
Journal articles

Temporal patterns in the upstream migration of European eels (Anguilla anguilla) at the Couesnon estuarine dam

Abstract : The temporal migration patterns of European glass eel Anguilla anguilla at the Couesnon estuarine dam (Mont-Saint-Michel Bay, France)were examined in winter and spring 2004 and 2005. The dam which is located close to the river mouth constitutes a major obstacle for upstreammigrating glass eels. The migration was observed at different temporal scales, from within individual tides to complete tidal cycles between successive spring tides. The maximum number of glass eels arrived downstream of the dam at the beginning and in the middle of the flood tide. Glass eels migrated through the dam openings preferentially from the middle of the flood to the beginning of the ebb tide. Eel densities were highest during the second tide of each tide cycle that arrived at the estuarine dam and when the difference in water level between upstream and downstream of the dam was greatest, particularly at the end of the flood. Analysis of the influence of each environmental factor provided a good prediction of the glass eel recruitment peaks and, therefore, of the most favourable temporal windows for their migration. The water level and temperature were the most important environmental factors. These results provide the information needed for a dam-management program that is compatible with glass eel migration.
Complete list of metadata

Cited literature [53 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-00793400
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Friday, February 22, 2013 - 11:53:56 AM
Last modification on : Friday, February 5, 2021 - 10:56:06 AM
Long-term archiving on: : Sunday, April 2, 2017 - 4:08:17 AM

File

Laffaille_6202.pdf
Files produced by the author(s)

Identifiers

Citation

Pascal Laffaille, Jean-Marie Caraguel, Antoine Legault. Temporal patterns in the upstream migration of European eels (Anguilla anguilla) at the Couesnon estuarine dam. Estuarine, Coastal and Shelf Science, Elsevier, 2007, 73 (1-2), pp. 81-90. ⟨10.1016/j.ecss.2006.12.011⟩. ⟨hal-00793400⟩

Share

Metrics

Record views

285

Files downloads

400