Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant
Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant facilities to accomodate downstream eel migration. The results of this recommendation are poorly studied, and the few studies that exist show varying bypass efficiencies. The current stud...
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Online Access: | https://hdl.handle.net/11250/3049760 https://doi.org/10.1111/jfb.15278 |
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/3049760 2023-05-15T13:26:53+02:00 Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant Kjærås, Halvor Baktoft, Henrik Silva, Ana T. Gjelland, Karl Øystein Økland, Finn Forseth, Torbjørn Szabo-Meszaros, Marcell Calles, Olle 2022 application/pdf https://hdl.handle.net/11250/3049760 https://doi.org/10.1111/jfb.15278 eng eng Wiley Norges teknisk-naturvitenskapelige universitet: Halvor Kjærås Norges forskningsråd: 257588 Norges forskningsråd: 244022 Journal of Fish Biology. 2022, . urn:issn:0022-1112 https://hdl.handle.net/11250/3049760 https://doi.org/10.1111/jfb.15278 cristin:2091847 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY 14 Journal of Fish Biology Fish behaviour Fiskeadferd Akustisk telemetri Acoustic telemetry Fiskepassasje Fish passage Peer reviewed Journal article 2022 ftntnutrondheimi https://doi.org/10.1111/jfb.15278 2023-02-15T23:43:53Z Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant facilities to accomodate downstream eel migration. The results of this recommendation are poorly studied, and the few studies that exist show varying bypass efficiencies. The current study used acoustic telemetry with depth sensors to explore the three‐dimensional migratory behaviour of downstream‐migrating silver eels. The eels were tracked as they approached a hydropower plant with a state‐of‐the‐art angled bar rack and full‐depth bypass. Downstream and upstream swimming differed in preferred vertical and lateral positions. During periods of local downstream movement, the density of observations was largest in the upper middle section, away from the river boundaries and in higher velocities. Conversely, when moving upstream, eels tended to avoid the upper layers of the middle part of the river, swimming closer to the riverbed and using the bank areas to a greater extent. Downstream‐moving fish swam higher in the water column during night and in turbid conditions (high discharge). When approaching the impassable bar rack and the full‐depth bypass, the eels searched most intensely but not exclusively along the bottom third of the rack, often exploring at new depths after changing direction. The impediment passage efficiency was 100% when both bypass solutions were considered. The study provides knowledge of the swimming behaviour of silver eels, which is relevant for the design of bypass solutions for eels at migration barriers. Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant publishedVersion Article in Journal/Newspaper Anguilla anguilla NTNU Open Archive (Norwegian University of Science and Technology) Journal of Fish Biology 102 2 465 478 |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
topic |
Fish behaviour Fiskeadferd Akustisk telemetri Acoustic telemetry Fiskepassasje Fish passage |
spellingShingle |
Fish behaviour Fiskeadferd Akustisk telemetri Acoustic telemetry Fiskepassasje Fish passage Kjærås, Halvor Baktoft, Henrik Silva, Ana T. Gjelland, Karl Øystein Økland, Finn Forseth, Torbjørn Szabo-Meszaros, Marcell Calles, Olle Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant |
topic_facet |
Fish behaviour Fiskeadferd Akustisk telemetri Acoustic telemetry Fiskepassasje Fish passage |
description |
Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant facilities to accomodate downstream eel migration. The results of this recommendation are poorly studied, and the few studies that exist show varying bypass efficiencies. The current study used acoustic telemetry with depth sensors to explore the three‐dimensional migratory behaviour of downstream‐migrating silver eels. The eels were tracked as they approached a hydropower plant with a state‐of‐the‐art angled bar rack and full‐depth bypass. Downstream and upstream swimming differed in preferred vertical and lateral positions. During periods of local downstream movement, the density of observations was largest in the upper middle section, away from the river boundaries and in higher velocities. Conversely, when moving upstream, eels tended to avoid the upper layers of the middle part of the river, swimming closer to the riverbed and using the bank areas to a greater extent. Downstream‐moving fish swam higher in the water column during night and in turbid conditions (high discharge). When approaching the impassable bar rack and the full‐depth bypass, the eels searched most intensely but not exclusively along the bottom third of the rack, often exploring at new depths after changing direction. The impediment passage efficiency was 100% when both bypass solutions were considered. The study provides knowledge of the swimming behaviour of silver eels, which is relevant for the design of bypass solutions for eels at migration barriers. Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant publishedVersion |
format |
Article in Journal/Newspaper |
author |
Kjærås, Halvor Baktoft, Henrik Silva, Ana T. Gjelland, Karl Øystein Økland, Finn Forseth, Torbjørn Szabo-Meszaros, Marcell Calles, Olle |
author_facet |
Kjærås, Halvor Baktoft, Henrik Silva, Ana T. Gjelland, Karl Øystein Økland, Finn Forseth, Torbjørn Szabo-Meszaros, Marcell Calles, Olle |
author_sort |
Kjærås, Halvor |
title |
Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant |
title_short |
Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant |
title_full |
Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant |
title_fullStr |
Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant |
title_full_unstemmed |
Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant |
title_sort |
three-dimensional migratory behaviour of european silver eels (anguilla anguilla) approaching a hydropower plant |
publisher |
Wiley |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/3049760 https://doi.org/10.1111/jfb.15278 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
14 Journal of Fish Biology |
op_relation |
Norges teknisk-naturvitenskapelige universitet: Halvor Kjærås Norges forskningsråd: 257588 Norges forskningsråd: 244022 Journal of Fish Biology. 2022, . urn:issn:0022-1112 https://hdl.handle.net/11250/3049760 https://doi.org/10.1111/jfb.15278 cristin:2091847 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1111/jfb.15278 |
container_title |
Journal of Fish Biology |
container_volume |
102 |
container_issue |
2 |
container_start_page |
465 |
op_container_end_page |
478 |
_version_ |
1766395141090705408 |