Migration pattern of silver eel (Anguilla anguilla, L.) in an obstructed river system.
The downstream migration of European silver eels in the River Frémur was examined to determine the potential effects of the numerous migration barriers that exist on waterways in western France. The Frémur has a 14 m high dam which creates a 3 · 106 m3 water supply reservoir, 6 km from tidal limit....
Published in: | Ecology of Freshwater Fish |
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John Wiley and Sons
2008
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Online Access: | http://oatao.univ-toulouse.fr/6220/ http://oatao.univ-toulouse.fr/6220/1/Acou_6220.pdf https://doi.org/10.1111/j.1600-0633.2008.00295.x |
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ftunivtoulouseoa:oai:oatao.univ-toulouse.fr:6220 2023-05-15T13:27:18+02:00 Migration pattern of silver eel (Anguilla anguilla, L.) in an obstructed river system. Acou, Anthony Laffaille, Pascal Legault, Antoine Feunteun, Eric Museum National d'Histoire Naturelle - MNHN (FRANCE) Fish-Pass (FRANCE) Université de Rennes 1 (FRANCE) Laboratoire Maritime de Dinard (Dinard, France) 2008-09 application/pdf http://oatao.univ-toulouse.fr/6220/ http://oatao.univ-toulouse.fr/6220/1/Acou_6220.pdf https://doi.org/10.1111/j.1600-0633.2008.00295.x en eng John Wiley and Sons http://oatao.univ-toulouse.fr/6220/1/Acou_6220.pdf Acou, Anthony and Laffaille, Pascal and Legault, Antoine and Feunteun, Eric. Migration pattern of silver eel (Anguilla anguilla, L.) in an obstructed river system. (2008) Ecology of Freshwater Fish, 17 (3). 432-442. ISSN 1600-0633 info:eu-repo/semantics/openAccess Biodiversité Ecosystèmes Anguilla anguilla Downstream migration Dam Water reservoir Environmental factors Article PeerReviewed info:eu-repo/semantics/article 2008 ftunivtoulouseoa https://doi.org/10.1111/j.1600-0633.2008.00295.x 2019-08-29T11:17:44Z The downstream migration of European silver eels in the River Frémur was examined to determine the potential effects of the numerous migration barriers that exist on waterways in western France. The Frémur has a 14 m high dam which creates a 3 · 106 m3 water supply reservoir, 6 km from tidal limit. Based on 8-year records (1996–2004) of migrant silver eels captured in a Wolf trap located about 1 km below the dam, the influence of this dam on the migration was examined. These records indicate that 91% of silver eels were captured when the dam was overtopped (i.e. when the water reservoir was full). The timings of the overflow periods varied greatly between years mainly because they are function of the duration of the filling period which in turn is dependent on the level of summer water abstraction and annual hydrological conditions. Consequently, migration periods occurred at variable dates (between November and April) which is late in comparison with nonobstructed European river systems (generally between August and December). During overflow periods the migration of silver eels increased markedly during rain events (increasing river flow). This indicates that flow flushes, are essential so that settled silver eels can orientate themselves and pass over the dam. The hypothesis of a ‘dam effect’ that could stop temporarily or permanently some of silver eels in the reservoir is discussed. Finally, the influence of the migration delays on the condition of silver eels is considered. Article in Journal/Newspaper Anguilla anguilla OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) Ecology of Freshwater Fish 17 3 432 442 |
institution |
Open Polar |
collection |
OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) |
op_collection_id |
ftunivtoulouseoa |
language |
English |
topic |
Biodiversité Ecosystèmes Anguilla anguilla Downstream migration Dam Water reservoir Environmental factors |
spellingShingle |
Biodiversité Ecosystèmes Anguilla anguilla Downstream migration Dam Water reservoir Environmental factors Acou, Anthony Laffaille, Pascal Legault, Antoine Feunteun, Eric Migration pattern of silver eel (Anguilla anguilla, L.) in an obstructed river system. |
topic_facet |
Biodiversité Ecosystèmes Anguilla anguilla Downstream migration Dam Water reservoir Environmental factors |
description |
The downstream migration of European silver eels in the River Frémur was examined to determine the potential effects of the numerous migration barriers that exist on waterways in western France. The Frémur has a 14 m high dam which creates a 3 · 106 m3 water supply reservoir, 6 km from tidal limit. Based on 8-year records (1996–2004) of migrant silver eels captured in a Wolf trap located about 1 km below the dam, the influence of this dam on the migration was examined. These records indicate that 91% of silver eels were captured when the dam was overtopped (i.e. when the water reservoir was full). The timings of the overflow periods varied greatly between years mainly because they are function of the duration of the filling period which in turn is dependent on the level of summer water abstraction and annual hydrological conditions. Consequently, migration periods occurred at variable dates (between November and April) which is late in comparison with nonobstructed European river systems (generally between August and December). During overflow periods the migration of silver eels increased markedly during rain events (increasing river flow). This indicates that flow flushes, are essential so that settled silver eels can orientate themselves and pass over the dam. The hypothesis of a ‘dam effect’ that could stop temporarily or permanently some of silver eels in the reservoir is discussed. Finally, the influence of the migration delays on the condition of silver eels is considered. |
author2 |
Museum National d'Histoire Naturelle - MNHN (FRANCE) Fish-Pass (FRANCE) Université de Rennes 1 (FRANCE) Laboratoire Maritime de Dinard (Dinard, France) |
format |
Article in Journal/Newspaper |
author |
Acou, Anthony Laffaille, Pascal Legault, Antoine Feunteun, Eric |
author_facet |
Acou, Anthony Laffaille, Pascal Legault, Antoine Feunteun, Eric |
author_sort |
Acou, Anthony |
title |
Migration pattern of silver eel (Anguilla anguilla, L.) in an obstructed river system. |
title_short |
Migration pattern of silver eel (Anguilla anguilla, L.) in an obstructed river system. |
title_full |
Migration pattern of silver eel (Anguilla anguilla, L.) in an obstructed river system. |
title_fullStr |
Migration pattern of silver eel (Anguilla anguilla, L.) in an obstructed river system. |
title_full_unstemmed |
Migration pattern of silver eel (Anguilla anguilla, L.) in an obstructed river system. |
title_sort |
migration pattern of silver eel (anguilla anguilla, l.) in an obstructed river system. |
publisher |
John Wiley and Sons |
publishDate |
2008 |
url |
http://oatao.univ-toulouse.fr/6220/ http://oatao.univ-toulouse.fr/6220/1/Acou_6220.pdf https://doi.org/10.1111/j.1600-0633.2008.00295.x |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_relation |
http://oatao.univ-toulouse.fr/6220/1/Acou_6220.pdf Acou, Anthony and Laffaille, Pascal and Legault, Antoine and Feunteun, Eric. Migration pattern of silver eel (Anguilla anguilla, L.) in an obstructed river system. (2008) Ecology of Freshwater Fish, 17 (3). 432-442. ISSN 1600-0633 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/j.1600-0633.2008.00295.x |
container_title |
Ecology of Freshwater Fish |
container_volume |
17 |
container_issue |
3 |
container_start_page |
432 |
op_container_end_page |
442 |
_version_ |
1766397609448046592 |