Assessing migratory bottlenecks and escapement of silver eel ( Anguilla anguilla) in the highly urbanized North Sea Canal basin, the Netherlands
Abstract Habitat fragmentation and migration barriers have attributed to the decline of European eel ( Anguilla anguilla ). The migration of silver eels through pumping stations, ship locks, and migration facilities within the North Sea Canal basin using acoustic telemetry and overall escapement by...
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Online Access: | http://dx.doi.org/10.1002/rra.4206 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.4206 |
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crwiley:10.1002/rra.4206 2024-06-02T07:55:10+00:00 Assessing migratory bottlenecks and escapement of silver eel ( Anguilla anguilla) in the highly urbanized North Sea Canal basin, the Netherlands van Keeken, Olvin Alior Griffioen, Arie Benjamin Tien, Nicola Stella Henriëtte Winter, Hendrik Volken 2023 http://dx.doi.org/10.1002/rra.4206 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.4206 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ River Research and Applications volume 39, issue 10, page 1972-1993 ISSN 1535-1459 1535-1467 journal-article 2023 crwiley https://doi.org/10.1002/rra.4206 2024-05-03T11:16:54Z Abstract Habitat fragmentation and migration barriers have attributed to the decline of European eel ( Anguilla anguilla ). The migration of silver eels through pumping stations, ship locks, and migration facilities within the North Sea Canal basin using acoustic telemetry and overall escapement by mark–recapture was studied. A network of 61 acoustic receivers and three PIT‐tag stations was built, and 305 silver eels were tagged with acoustic transmitters and 3923 with PIT‐tags. Of all the silver eels that were detected, 55% passed barriers between the polders and the canal and 46% also passed the barrier complex at IJmuiden to sea, mainly via the ship locks. Overall, silver eel escapement to the North Sea per year averaged 81,629 silver eels and 14.3% suffered mortality in the pumping station at IJmuiden. Migration speed was lower for silver eels that initiated their migration upstream compared with silver eels further downstream, higher for silver eels passing barriers later in the migration period, and highest at sea. This study of silver eel movement and escapement in the North Sea canal basin indicated several bottlenecks. Passage success along barriers varied strongly between sites and types of barriers. While at two smaller locations, silver eels migrated through the pedal valves in the ship lock gates, a small passage facility and the pedal valves in a ship lock at complex IJmuiden did not enhance silver eel migration. The barriers and unnatural canal system caused additional delay during silver eel migrations. Mitigation measures for management could include installing fish‐friendly pumps, using pumping stations only during the day, and in addition opening ship locks and pedal valves at the beginning of the night. Article in Journal/Newspaper Anguilla anguilla Wiley Online Library River Research and Applications 39 10 1972 1993 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Habitat fragmentation and migration barriers have attributed to the decline of European eel ( Anguilla anguilla ). The migration of silver eels through pumping stations, ship locks, and migration facilities within the North Sea Canal basin using acoustic telemetry and overall escapement by mark–recapture was studied. A network of 61 acoustic receivers and three PIT‐tag stations was built, and 305 silver eels were tagged with acoustic transmitters and 3923 with PIT‐tags. Of all the silver eels that were detected, 55% passed barriers between the polders and the canal and 46% also passed the barrier complex at IJmuiden to sea, mainly via the ship locks. Overall, silver eel escapement to the North Sea per year averaged 81,629 silver eels and 14.3% suffered mortality in the pumping station at IJmuiden. Migration speed was lower for silver eels that initiated their migration upstream compared with silver eels further downstream, higher for silver eels passing barriers later in the migration period, and highest at sea. This study of silver eel movement and escapement in the North Sea canal basin indicated several bottlenecks. Passage success along barriers varied strongly between sites and types of barriers. While at two smaller locations, silver eels migrated through the pedal valves in the ship lock gates, a small passage facility and the pedal valves in a ship lock at complex IJmuiden did not enhance silver eel migration. The barriers and unnatural canal system caused additional delay during silver eel migrations. Mitigation measures for management could include installing fish‐friendly pumps, using pumping stations only during the day, and in addition opening ship locks and pedal valves at the beginning of the night. |
format |
Article in Journal/Newspaper |
author |
van Keeken, Olvin Alior Griffioen, Arie Benjamin Tien, Nicola Stella Henriëtte Winter, Hendrik Volken |
spellingShingle |
van Keeken, Olvin Alior Griffioen, Arie Benjamin Tien, Nicola Stella Henriëtte Winter, Hendrik Volken Assessing migratory bottlenecks and escapement of silver eel ( Anguilla anguilla) in the highly urbanized North Sea Canal basin, the Netherlands |
author_facet |
van Keeken, Olvin Alior Griffioen, Arie Benjamin Tien, Nicola Stella Henriëtte Winter, Hendrik Volken |
author_sort |
van Keeken, Olvin Alior |
title |
Assessing migratory bottlenecks and escapement of silver eel ( Anguilla anguilla) in the highly urbanized North Sea Canal basin, the Netherlands |
title_short |
Assessing migratory bottlenecks and escapement of silver eel ( Anguilla anguilla) in the highly urbanized North Sea Canal basin, the Netherlands |
title_full |
Assessing migratory bottlenecks and escapement of silver eel ( Anguilla anguilla) in the highly urbanized North Sea Canal basin, the Netherlands |
title_fullStr |
Assessing migratory bottlenecks and escapement of silver eel ( Anguilla anguilla) in the highly urbanized North Sea Canal basin, the Netherlands |
title_full_unstemmed |
Assessing migratory bottlenecks and escapement of silver eel ( Anguilla anguilla) in the highly urbanized North Sea Canal basin, the Netherlands |
title_sort |
assessing migratory bottlenecks and escapement of silver eel ( anguilla anguilla) in the highly urbanized north sea canal basin, the netherlands |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/rra.4206 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.4206 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
River Research and Applications volume 39, issue 10, page 1972-1993 ISSN 1535-1459 1535-1467 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1002/rra.4206 |
container_title |
River Research and Applications |
container_volume |
39 |
container_issue |
10 |
container_start_page |
1972 |
op_container_end_page |
1993 |
_version_ |
1800746459675492352 |