Session C5: Downstream Migration of the European Eel (A. anguilla): Movement Patterns and the Potential Impact of Environmental Factors
Abstract: Recruitment of European eels (Anguilla anguilla) has declined to the extent that they have been added to the IUCN Red List of Threatened Species. Therefore, it is critical to ensure that eels complete their outward river migration in order to contribute to the available spawning stock. We...
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ftunivmassamh:oai:scholarworks.umass.edu:fishpassage_conference-1996 2023-05-15T13:27:53+02:00 Session C5: Downstream Migration of the European Eel (A. anguilla): Movement Patterns and the Potential Impact of Environmental Factors Stein, Florian Doering-Arjes, Peer Fladung, Erik Brämick, Uwe Bendal, Barry Schroder, Boris 2015-06-23T21:00:00Z application/pdf https://scholarworks.umass.edu/fishpassage_conference/2015/June23/20 https://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1996&context=fishpassage_conference unknown ScholarWorks@UMass Amherst https://scholarworks.umass.edu/fishpassage_conference/2015/June23/20 https://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1996&context=fishpassage_conference International Conference on Engineering and Ecohydrology for Fish Passage Aquaculture and Fisheries Hydraulic Engineering text 2015 ftunivmassamh 2022-01-09T19:28:27Z Abstract: Recruitment of European eels (Anguilla anguilla) has declined to the extent that they have been added to the IUCN Red List of Threatened Species. Therefore, it is critical to ensure that eels complete their outward river migration in order to contribute to the available spawning stock. We conducted a four-year (2007-2011) telemetry study to understand the migratory behaviour and potential impact of environmental factors on the eel during this critical life stage. Out of 399 female eels tagged with acoustic transmitters, only 28 % demonstrated clear downstream migratory behaviour. Fifty-five percent were detected exhibiting no downstream migration behaviour and 17 % were not detected at any monitoring station. Movement patterns of downstream-migrating (silver) eels were characterised by nocturnal activity and seasonal migration, with distinct peaks in autumn and spring. Migration was often discontinuous and exhibited phases of active locomotion and expanded stopovers. The most important determinants of movement activity were water temperature, cumulative precipitation, and moonlight, although the significance varied by season and location in the river basin. Our results evidence a discontinuous, stepwise migration over an extended period. Furthermore, our findings indicate that migration success depends on holding duration prior to tagging, and environmental predictors with varying importance depending on the season, as well as the locations of capture, tagging and release. Text Anguilla anguilla European eel University of Massachusetts: ScholarWorks@UMass Amherst |
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Open Polar |
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University of Massachusetts: ScholarWorks@UMass Amherst |
op_collection_id |
ftunivmassamh |
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topic |
Aquaculture and Fisheries Hydraulic Engineering |
spellingShingle |
Aquaculture and Fisheries Hydraulic Engineering Stein, Florian Doering-Arjes, Peer Fladung, Erik Brämick, Uwe Bendal, Barry Schroder, Boris Session C5: Downstream Migration of the European Eel (A. anguilla): Movement Patterns and the Potential Impact of Environmental Factors |
topic_facet |
Aquaculture and Fisheries Hydraulic Engineering |
description |
Abstract: Recruitment of European eels (Anguilla anguilla) has declined to the extent that they have been added to the IUCN Red List of Threatened Species. Therefore, it is critical to ensure that eels complete their outward river migration in order to contribute to the available spawning stock. We conducted a four-year (2007-2011) telemetry study to understand the migratory behaviour and potential impact of environmental factors on the eel during this critical life stage. Out of 399 female eels tagged with acoustic transmitters, only 28 % demonstrated clear downstream migratory behaviour. Fifty-five percent were detected exhibiting no downstream migration behaviour and 17 % were not detected at any monitoring station. Movement patterns of downstream-migrating (silver) eels were characterised by nocturnal activity and seasonal migration, with distinct peaks in autumn and spring. Migration was often discontinuous and exhibited phases of active locomotion and expanded stopovers. The most important determinants of movement activity were water temperature, cumulative precipitation, and moonlight, although the significance varied by season and location in the river basin. Our results evidence a discontinuous, stepwise migration over an extended period. Furthermore, our findings indicate that migration success depends on holding duration prior to tagging, and environmental predictors with varying importance depending on the season, as well as the locations of capture, tagging and release. |
format |
Text |
author |
Stein, Florian Doering-Arjes, Peer Fladung, Erik Brämick, Uwe Bendal, Barry Schroder, Boris |
author_facet |
Stein, Florian Doering-Arjes, Peer Fladung, Erik Brämick, Uwe Bendal, Barry Schroder, Boris |
author_sort |
Stein, Florian |
title |
Session C5: Downstream Migration of the European Eel (A. anguilla): Movement Patterns and the Potential Impact of Environmental Factors |
title_short |
Session C5: Downstream Migration of the European Eel (A. anguilla): Movement Patterns and the Potential Impact of Environmental Factors |
title_full |
Session C5: Downstream Migration of the European Eel (A. anguilla): Movement Patterns and the Potential Impact of Environmental Factors |
title_fullStr |
Session C5: Downstream Migration of the European Eel (A. anguilla): Movement Patterns and the Potential Impact of Environmental Factors |
title_full_unstemmed |
Session C5: Downstream Migration of the European Eel (A. anguilla): Movement Patterns and the Potential Impact of Environmental Factors |
title_sort |
session c5: downstream migration of the european eel (a. anguilla): movement patterns and the potential impact of environmental factors |
publisher |
ScholarWorks@UMass Amherst |
publishDate |
2015 |
url |
https://scholarworks.umass.edu/fishpassage_conference/2015/June23/20 https://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1996&context=fishpassage_conference |
genre |
Anguilla anguilla European eel |
genre_facet |
Anguilla anguilla European eel |
op_source |
International Conference on Engineering and Ecohydrology for Fish Passage |
op_relation |
https://scholarworks.umass.edu/fishpassage_conference/2015/June23/20 https://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1996&context=fishpassage_conference |
_version_ |
1766400925347348480 |