Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand‐Lieu Lake, France): New insights from regulated acoustic telemetry data
Abstract Current knowledge about the downstream migration of sexually mature European eels ( Anguilla anguilla ) remains incomplete, particularly in still water habitats such as lakes and wetlands subject to water level management. However, for the management of this endangered species, it is import...
Published in: | Ecology of Freshwater Fish |
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Online Access: | http://dx.doi.org/10.1111/eff.12371 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Feff.12371 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12371 |
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crwiley:10.1111/eff.12371 2024-06-02T07:55:13+00:00 Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand‐Lieu Lake, France): New insights from regulated acoustic telemetry data Trancart, Thomas Feunteun, Eric Danet, Valentin Carpentier, Alexandre Mazel, Virgile Charrier, Fabien Druet, Morgan Acou, Anthony Agence de l'Eau Loire Bretagne Region Pays de Loire 2017 http://dx.doi.org/10.1111/eff.12371 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Feff.12371 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12371 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ecology of Freshwater Fish volume 27, issue 2, page 570-579 ISSN 0906-6691 1600-0633 journal-article 2017 crwiley https://doi.org/10.1111/eff.12371 2024-05-03T10:41:27Z Abstract Current knowledge about the downstream migration of sexually mature European eels ( Anguilla anguilla ) remains incomplete, particularly in still water habitats such as lakes and wetlands subject to water level management. However, for the management of this endangered species, it is important to understand migration dynamics, and contribution to the breeding stock. This study aimed to assess the parameters that trigger and guide the migration of silver eels in the largest floodplain lake and associated wetlands in France (the sluice regulated Grand‐Lieu Lake). A telemetry survey of 50 acoustic and PIT ‐tagged female silver eels was performed during the 2015–2016 migration period. We deployed a novel telemetric approach, using receivers to delimit several restricted virtual boxes to determine the instantaneous location of individuals and to transform simple discrete telemetric data into presence/absence data. The low numbers leaving the lake centre are probably explained by the lack of orienting water flows or other environmental clues, but whilst the fate of 34% (17/50) of the tagged eels is unknown, 18% (9/50) were caught by commercial fishermen. Modelling showed that detections were not clearly associated with environmental factors typically involved in riverine migrations (e.g. current velocity, atmospheric pressure and temperature) but they were particularly associated with higher and increasing water levels and, for eels exiting the lake, a sharp increase when sluice gates were opened to an effective gap of >75 cm. It is concluded that management of water levels and sluice gate opening during the migration period might aid escapement of silver eels. Article in Journal/Newspaper Anguilla anguilla Wiley Online Library Ecology of Freshwater Fish 27 2 570 579 |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract Current knowledge about the downstream migration of sexually mature European eels ( Anguilla anguilla ) remains incomplete, particularly in still water habitats such as lakes and wetlands subject to water level management. However, for the management of this endangered species, it is important to understand migration dynamics, and contribution to the breeding stock. This study aimed to assess the parameters that trigger and guide the migration of silver eels in the largest floodplain lake and associated wetlands in France (the sluice regulated Grand‐Lieu Lake). A telemetry survey of 50 acoustic and PIT ‐tagged female silver eels was performed during the 2015–2016 migration period. We deployed a novel telemetric approach, using receivers to delimit several restricted virtual boxes to determine the instantaneous location of individuals and to transform simple discrete telemetric data into presence/absence data. The low numbers leaving the lake centre are probably explained by the lack of orienting water flows or other environmental clues, but whilst the fate of 34% (17/50) of the tagged eels is unknown, 18% (9/50) were caught by commercial fishermen. Modelling showed that detections were not clearly associated with environmental factors typically involved in riverine migrations (e.g. current velocity, atmospheric pressure and temperature) but they were particularly associated with higher and increasing water levels and, for eels exiting the lake, a sharp increase when sluice gates were opened to an effective gap of >75 cm. It is concluded that management of water levels and sluice gate opening during the migration period might aid escapement of silver eels. |
author2 |
Agence de l'Eau Loire Bretagne Region Pays de Loire |
format |
Article in Journal/Newspaper |
author |
Trancart, Thomas Feunteun, Eric Danet, Valentin Carpentier, Alexandre Mazel, Virgile Charrier, Fabien Druet, Morgan Acou, Anthony |
spellingShingle |
Trancart, Thomas Feunteun, Eric Danet, Valentin Carpentier, Alexandre Mazel, Virgile Charrier, Fabien Druet, Morgan Acou, Anthony Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand‐Lieu Lake, France): New insights from regulated acoustic telemetry data |
author_facet |
Trancart, Thomas Feunteun, Eric Danet, Valentin Carpentier, Alexandre Mazel, Virgile Charrier, Fabien Druet, Morgan Acou, Anthony |
author_sort |
Trancart, Thomas |
title |
Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand‐Lieu Lake, France): New insights from regulated acoustic telemetry data |
title_short |
Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand‐Lieu Lake, France): New insights from regulated acoustic telemetry data |
title_full |
Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand‐Lieu Lake, France): New insights from regulated acoustic telemetry data |
title_fullStr |
Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand‐Lieu Lake, France): New insights from regulated acoustic telemetry data |
title_full_unstemmed |
Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand‐Lieu Lake, France): New insights from regulated acoustic telemetry data |
title_sort |
migration behaviour and escapement of european silver eels from a large lake and wetland system subject to water level management (grand‐lieu lake, france): new insights from regulated acoustic telemetry data |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1111/eff.12371 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Feff.12371 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12371 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
Ecology of Freshwater Fish volume 27, issue 2, page 570-579 ISSN 0906-6691 1600-0633 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/eff.12371 |
container_title |
Ecology of Freshwater Fish |
container_volume |
27 |
container_issue |
2 |
container_start_page |
570 |
op_container_end_page |
579 |
_version_ |
1800747022585692160 |