Success of a low-sloping rack for improving downstream passage of silver eels at a hydroelectric plant
The European eel (Anguilla anguilla) is a critically endangered species, and one major threat is the survival of silver eels migrating downstream towards the sea from lake and river rearing areas. During this migration, many eels are impinged and die on intake racks, or are injured or killed when pa...
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Online Access: | http://hdl.handle.net/11583/2517713 https://doi.org/10.1111/fwb.12199 |
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ftpoltorinoiris:oai:iris.polito.it:11583/2517713 2024-02-11T09:55:29+01:00 Success of a low-sloping rack for improving downstream passage of silver eels at a hydroelectric plant Calles O. Karlsson S. Vezza P. Tielman J. COMOGLIO, Claudio Calles, O. Karlsson, S. Vezza, P. Comoglio, Claudio Tielman, J. 2013 http://hdl.handle.net/11583/2517713 https://doi.org/10.1111/fwb.12199 eng eng Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598 info:eu-repo/semantics/altIdentifier/wos/WOS:000323724600014 volume:58 issue:10 firstpage:2168 lastpage:2179 numberofpages:12 journal:FRESHWATER BIOLOGY http://hdl.handle.net/11583/2517713 doi:10.1111/fwb.12199 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84883273477 Anguilla anguilla Collection facility Downstream passage Passage succe Telemetry info:eu-repo/semantics/article 2013 ftpoltorinoiris https://doi.org/10.1111/fwb.12199 2024-01-16T23:12:27Z The European eel (Anguilla anguilla) is a critically endangered species, and one major threat is the survival of silver eels migrating downstream towards the sea from lake and river rearing areas. During this migration, many eels are impinged and die on intake racks, or are injured or killed when passing through turbines. Intake racks at a hydroelectric plant were modified to avoid impingement and to collect eels without injury; high mortality on both racks and in turbines was previously documented. Modifications consisted of reducing the rack gap width from 20 to 18 mm, decreasing the rack slope from 63 to 35 degrees, increasing the rack surface area by 58% and installing six openings in the rack leading to traps. Downstream passage conditions for silver eels at the hydroelectric plant were significantly improved, reducing mortality from >70% at the old steep 20 mm racks to <10% at the modified 18 mm rack collection facility. No tagged eels were impinged and killed on the racks, and 80% entered the collection facility. Survival can probably be improved even more, as the individuals that passed the facility most likely escaped through holes in the traps. Moreover, injured untagged eels were still encountered at the modified racks, illustrating the need for rehabilitative measures to be implemented at all obstacles between the main eel rearing areas and the sea. Article in Journal/Newspaper Anguilla anguilla European eel PORTO@iris (Publications Open Repository TOrino - Politecnico di Torino) Freshwater Biology 58 10 2168 2179 |
institution |
Open Polar |
collection |
PORTO@iris (Publications Open Repository TOrino - Politecnico di Torino) |
op_collection_id |
ftpoltorinoiris |
language |
English |
topic |
Anguilla anguilla Collection facility Downstream passage Passage succe Telemetry |
spellingShingle |
Anguilla anguilla Collection facility Downstream passage Passage succe Telemetry Calles O. Karlsson S. Vezza P. Tielman J. COMOGLIO, Claudio Success of a low-sloping rack for improving downstream passage of silver eels at a hydroelectric plant |
topic_facet |
Anguilla anguilla Collection facility Downstream passage Passage succe Telemetry |
description |
The European eel (Anguilla anguilla) is a critically endangered species, and one major threat is the survival of silver eels migrating downstream towards the sea from lake and river rearing areas. During this migration, many eels are impinged and die on intake racks, or are injured or killed when passing through turbines. Intake racks at a hydroelectric plant were modified to avoid impingement and to collect eels without injury; high mortality on both racks and in turbines was previously documented. Modifications consisted of reducing the rack gap width from 20 to 18 mm, decreasing the rack slope from 63 to 35 degrees, increasing the rack surface area by 58% and installing six openings in the rack leading to traps. Downstream passage conditions for silver eels at the hydroelectric plant were significantly improved, reducing mortality from >70% at the old steep 20 mm racks to <10% at the modified 18 mm rack collection facility. No tagged eels were impinged and killed on the racks, and 80% entered the collection facility. Survival can probably be improved even more, as the individuals that passed the facility most likely escaped through holes in the traps. Moreover, injured untagged eels were still encountered at the modified racks, illustrating the need for rehabilitative measures to be implemented at all obstacles between the main eel rearing areas and the sea. |
author2 |
Calles, O. Karlsson, S. Vezza, P. Comoglio, Claudio Tielman, J. |
format |
Article in Journal/Newspaper |
author |
Calles O. Karlsson S. Vezza P. Tielman J. COMOGLIO, Claudio |
author_facet |
Calles O. Karlsson S. Vezza P. Tielman J. COMOGLIO, Claudio |
author_sort |
Calles O. |
title |
Success of a low-sloping rack for improving downstream passage of silver eels at a hydroelectric plant |
title_short |
Success of a low-sloping rack for improving downstream passage of silver eels at a hydroelectric plant |
title_full |
Success of a low-sloping rack for improving downstream passage of silver eels at a hydroelectric plant |
title_fullStr |
Success of a low-sloping rack for improving downstream passage of silver eels at a hydroelectric plant |
title_full_unstemmed |
Success of a low-sloping rack for improving downstream passage of silver eels at a hydroelectric plant |
title_sort |
success of a low-sloping rack for improving downstream passage of silver eels at a hydroelectric plant |
publisher |
Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598 |
publishDate |
2013 |
url |
http://hdl.handle.net/11583/2517713 https://doi.org/10.1111/fwb.12199 |
genre |
Anguilla anguilla European eel |
genre_facet |
Anguilla anguilla European eel |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000323724600014 volume:58 issue:10 firstpage:2168 lastpage:2179 numberofpages:12 journal:FRESHWATER BIOLOGY http://hdl.handle.net/11583/2517713 doi:10.1111/fwb.12199 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84883273477 |
op_doi |
https://doi.org/10.1111/fwb.12199 |
container_title |
Freshwater Biology |
container_volume |
58 |
container_issue |
10 |
container_start_page |
2168 |
op_container_end_page |
2179 |
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1790596579811393536 |