Dynamics of upstream movements of the European eel Anguilla anguilla in an inland area of the River Meuse over the last 20 years
peer reviewed The dynamics of upstream movements of the yellow eel Anguilla anguilla were investigated at Lixhe on the Belgian River Meuse in an inland fish pass regularly monitored from 1992 to 2014. Based on a constant year-to-year sampling effort, we examined the abundance of ascending yellow eel...
Published in: | Environmental Biology of Fishes |
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Language: | English |
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Springer Science & Business Media B.V.
2016
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Online Access: | https://orbi.uliege.be/handle/2268/193170 https://orbi.uliege.be/bitstream/2268/193170/1/EBF_NzauMatondo%26Ovidio_eel_2016.pdf https://doi.org/10.1007/s10641-016-0469-x |
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ftorbi:oai:orbi.ulg.ac.be:2268/193170 2024-04-21T07:45:31+00:00 Dynamics of upstream movements of the European eel Anguilla anguilla in an inland area of the River Meuse over the last 20 years Nzau Matondo, Billy Ovidio, Michaël AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège 2016-03 https://orbi.uliege.be/handle/2268/193170 https://orbi.uliege.be/bitstream/2268/193170/1/EBF_NzauMatondo%26Ovidio_eel_2016.pdf https://doi.org/10.1007/s10641-016-0469-x en eng Springer Science & Business Media B.V. urn:issn:0378-1909 urn:issn:1573-5133 https://orbi.uliege.be/handle/2268/193170 info:hdl:2268/193170 https://orbi.uliege.be/bitstream/2268/193170/1/EBF_NzauMatondo%26Ovidio_eel_2016.pdf doi:10.1007/s10641-016-0469-x scopus-id:2-s2.0-84957650329 open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess Environmental Biology of Fishes, 99, 223-235 (2016-03) Abundance Season Migration yellow eel feshwater Anguilla anguilla Life sciences Zoology Sciences du vivant Zoologie journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2016 ftorbi https://doi.org/10.1007/s10641-016-0469-x 2024-03-27T14:50:08Z peer reviewed The dynamics of upstream movements of the yellow eel Anguilla anguilla were investigated at Lixhe on the Belgian River Meuse in an inland fish pass regularly monitored from 1992 to 2014. Based on a constant year-to-year sampling effort, we examined the abundance of ascending yellow eels and their body size, seasonal movement, and the associated water temperature and flow. Over the last 23 years, the number of ascending yellow eels has declined at an average 4.2% per year since 1992. The abundance of eels in 2014 is estimated at 4.5% of the ascending stock in 1992. We observed that some annual variations in eel abundance at Lixhe might be related to opening fish passes downstream of the study site. The results clearly demonstrated that long-term declining abundance of eels has resulted in increased sizes (mean increase, 4.1 mm per year since 1992) and temperatures triggering the upstream movement process (1.03°C per decade), with earlier dates for the last eel passages reducing the difference between temperature extremes of eel passages through the fish pass during the migration season. Eel movements occurred in spring and summer at low river discharge and were mainly triggered by high-temperature events. Eels have become larger with time because of improved feeding opportunities and more growth habitats available resulting from the long-term reduction in recruitment. This study highlights the importance of investigating long time spans for a better comprehension of the changes observed in yellow eels and for the optimization of management measures and future research. Article in Journal/Newspaper Anguilla anguilla University of Liège: ORBi (Open Repository and Bibliography) Environmental Biology of Fishes 99 2-3 223 235 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Abundance Season Migration yellow eel feshwater Anguilla anguilla Life sciences Zoology Sciences du vivant Zoologie |
spellingShingle |
Abundance Season Migration yellow eel feshwater Anguilla anguilla Life sciences Zoology Sciences du vivant Zoologie Nzau Matondo, Billy Ovidio, Michaël Dynamics of upstream movements of the European eel Anguilla anguilla in an inland area of the River Meuse over the last 20 years |
topic_facet |
Abundance Season Migration yellow eel feshwater Anguilla anguilla Life sciences Zoology Sciences du vivant Zoologie |
description |
peer reviewed The dynamics of upstream movements of the yellow eel Anguilla anguilla were investigated at Lixhe on the Belgian River Meuse in an inland fish pass regularly monitored from 1992 to 2014. Based on a constant year-to-year sampling effort, we examined the abundance of ascending yellow eels and their body size, seasonal movement, and the associated water temperature and flow. Over the last 23 years, the number of ascending yellow eels has declined at an average 4.2% per year since 1992. The abundance of eels in 2014 is estimated at 4.5% of the ascending stock in 1992. We observed that some annual variations in eel abundance at Lixhe might be related to opening fish passes downstream of the study site. The results clearly demonstrated that long-term declining abundance of eels has resulted in increased sizes (mean increase, 4.1 mm per year since 1992) and temperatures triggering the upstream movement process (1.03°C per decade), with earlier dates for the last eel passages reducing the difference between temperature extremes of eel passages through the fish pass during the migration season. Eel movements occurred in spring and summer at low river discharge and were mainly triggered by high-temperature events. Eels have become larger with time because of improved feeding opportunities and more growth habitats available resulting from the long-term reduction in recruitment. This study highlights the importance of investigating long time spans for a better comprehension of the changes observed in yellow eels and for the optimization of management measures and future research. |
author2 |
AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège |
format |
Article in Journal/Newspaper |
author |
Nzau Matondo, Billy Ovidio, Michaël |
author_facet |
Nzau Matondo, Billy Ovidio, Michaël |
author_sort |
Nzau Matondo, Billy |
title |
Dynamics of upstream movements of the European eel Anguilla anguilla in an inland area of the River Meuse over the last 20 years |
title_short |
Dynamics of upstream movements of the European eel Anguilla anguilla in an inland area of the River Meuse over the last 20 years |
title_full |
Dynamics of upstream movements of the European eel Anguilla anguilla in an inland area of the River Meuse over the last 20 years |
title_fullStr |
Dynamics of upstream movements of the European eel Anguilla anguilla in an inland area of the River Meuse over the last 20 years |
title_full_unstemmed |
Dynamics of upstream movements of the European eel Anguilla anguilla in an inland area of the River Meuse over the last 20 years |
title_sort |
dynamics of upstream movements of the european eel anguilla anguilla in an inland area of the river meuse over the last 20 years |
publisher |
Springer Science & Business Media B.V. |
publishDate |
2016 |
url |
https://orbi.uliege.be/handle/2268/193170 https://orbi.uliege.be/bitstream/2268/193170/1/EBF_NzauMatondo%26Ovidio_eel_2016.pdf https://doi.org/10.1007/s10641-016-0469-x |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
Environmental Biology of Fishes, 99, 223-235 (2016-03) |
op_relation |
urn:issn:0378-1909 urn:issn:1573-5133 https://orbi.uliege.be/handle/2268/193170 info:hdl:2268/193170 https://orbi.uliege.be/bitstream/2268/193170/1/EBF_NzauMatondo%26Ovidio_eel_2016.pdf doi:10.1007/s10641-016-0469-x scopus-id:2-s2.0-84957650329 |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s10641-016-0469-x |
container_title |
Environmental Biology of Fishes |
container_volume |
99 |
container_issue |
2-3 |
container_start_page |
223 |
op_container_end_page |
235 |
_version_ |
1796940466214666240 |