Hook shedding and post-release fate of deep-hooked European eel
- The European eel (Anguilla anguilla) is a commercially and recreationally important fishery target species. In the last decades, the eel has experienced dramatic stock declines and has been listed as critically endangered. To reduce fishing mortality, several European countries have closed the fis...
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Online Access: | http://hdl.handle.net/11250/2398333 https://doi.org/10.1016/j.biocon.2016.04.015 |
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ftimr:oai:imr.brage.unit.no:11250/2398333 2023-05-15T13:28:04+02:00 Hook shedding and post-release fate of deep-hooked European eel Weltersbach, Marc Simon Ferter, Keno Sambraus, Florian Strehlow, Harry Vincent 2016-08-05T13:15:52Z application/pdf http://hdl.handle.net/11250/2398333 https://doi.org/10.1016/j.biocon.2016.04.015 eng eng Elsevier Biological Conservation 2016, 199:16-24 urn:issn:0006-3207 http://hdl.handle.net/11250/2398333 https://doi.org/10.1016/j.biocon.2016.04.015 cristin:1355180 Navngivelse-DelPåSammeVilkår 3.0 Norge http://creativecommons.org/licenses/by-sa/3.0/no/ CC-BY-SA 16-24 199 Biological Conservation VDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskehelse : 923 VDP::Agriculture and fisheries science: 900::Fisheries science: 920::Fish health: 923 VDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskeriteknologi: 924 VDP::Agriculture and fisheries science: 900::Fisheries science: 920::Fisheries technology: 924 Journal article Peer reviewed 2016 ftimr https://doi.org/10.1016/j.biocon.2016.04.015 2021-09-23T20:16:11Z - The European eel (Anguilla anguilla) is a commercially and recreationally important fishery target species. In the last decades, the eel has experienced dramatic stock declines and has been listed as critically endangered. To reduce fishing mortality, several European countries have closed the fishery or introduced stricter management measures which increase the likelihood of catch-and-release in the recreational fishery. This study investigated hook shedding mechanisms of deep-hooked, line-cut eels via radiography, and quantified hook shedding rates, post-release mortality and sub-lethal effects in captivity. Eels were caught with four different hook treatments, monitored in a tank for 23 weeks, and radiographed 0, 1, 3, 10, 24, 54, 115 and 163 days after capture. After 163 days, total hook shedding rate was significantly higher for smaller hooks (41.2%) compared to larger hooks (0.0%), and increased with fish length. Post-release mortality rates ranged between 27.3% and 50.0% after 23 weeks (not adjusted for handling and holding) and did not differ significantly between hook treatments. The majority of dead eels showed gastric perforations caused by the hooks leading to internal haemorrhaging and the intrusion of digestive fluids into the body cavity inducing lethal degradation and inflammation of vital organs. Anglers are encouraged to minimise bycatch of eel in countries where eel harvest is prohibited. Anglers targeting eel should use selective and appropriate fishing gears, baits and tactics (e.g. very large hooks, immediate hook setting after a bite) to reduce deep hooking and the catch of undersized eels, ultimately promoting the eel's conservation. Article in Journal/Newspaper Anguilla anguilla European eel Institute for Marine Research: Brage IMR Biological Conservation 199 16 24 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
VDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskehelse : 923 VDP::Agriculture and fisheries science: 900::Fisheries science: 920::Fish health: 923 VDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskeriteknologi: 924 VDP::Agriculture and fisheries science: 900::Fisheries science: 920::Fisheries technology: 924 |
spellingShingle |
VDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskehelse : 923 VDP::Agriculture and fisheries science: 900::Fisheries science: 920::Fish health: 923 VDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskeriteknologi: 924 VDP::Agriculture and fisheries science: 900::Fisheries science: 920::Fisheries technology: 924 Weltersbach, Marc Simon Ferter, Keno Sambraus, Florian Strehlow, Harry Vincent Hook shedding and post-release fate of deep-hooked European eel |
topic_facet |
VDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskehelse : 923 VDP::Agriculture and fisheries science: 900::Fisheries science: 920::Fish health: 923 VDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskeriteknologi: 924 VDP::Agriculture and fisheries science: 900::Fisheries science: 920::Fisheries technology: 924 |
description |
- The European eel (Anguilla anguilla) is a commercially and recreationally important fishery target species. In the last decades, the eel has experienced dramatic stock declines and has been listed as critically endangered. To reduce fishing mortality, several European countries have closed the fishery or introduced stricter management measures which increase the likelihood of catch-and-release in the recreational fishery. This study investigated hook shedding mechanisms of deep-hooked, line-cut eels via radiography, and quantified hook shedding rates, post-release mortality and sub-lethal effects in captivity. Eels were caught with four different hook treatments, monitored in a tank for 23 weeks, and radiographed 0, 1, 3, 10, 24, 54, 115 and 163 days after capture. After 163 days, total hook shedding rate was significantly higher for smaller hooks (41.2%) compared to larger hooks (0.0%), and increased with fish length. Post-release mortality rates ranged between 27.3% and 50.0% after 23 weeks (not adjusted for handling and holding) and did not differ significantly between hook treatments. The majority of dead eels showed gastric perforations caused by the hooks leading to internal haemorrhaging and the intrusion of digestive fluids into the body cavity inducing lethal degradation and inflammation of vital organs. Anglers are encouraged to minimise bycatch of eel in countries where eel harvest is prohibited. Anglers targeting eel should use selective and appropriate fishing gears, baits and tactics (e.g. very large hooks, immediate hook setting after a bite) to reduce deep hooking and the catch of undersized eels, ultimately promoting the eel's conservation. |
format |
Article in Journal/Newspaper |
author |
Weltersbach, Marc Simon Ferter, Keno Sambraus, Florian Strehlow, Harry Vincent |
author_facet |
Weltersbach, Marc Simon Ferter, Keno Sambraus, Florian Strehlow, Harry Vincent |
author_sort |
Weltersbach, Marc Simon |
title |
Hook shedding and post-release fate of deep-hooked European eel |
title_short |
Hook shedding and post-release fate of deep-hooked European eel |
title_full |
Hook shedding and post-release fate of deep-hooked European eel |
title_fullStr |
Hook shedding and post-release fate of deep-hooked European eel |
title_full_unstemmed |
Hook shedding and post-release fate of deep-hooked European eel |
title_sort |
hook shedding and post-release fate of deep-hooked european eel |
publisher |
Elsevier |
publishDate |
2016 |
url |
http://hdl.handle.net/11250/2398333 https://doi.org/10.1016/j.biocon.2016.04.015 |
genre |
Anguilla anguilla European eel |
genre_facet |
Anguilla anguilla European eel |
op_source |
16-24 199 Biological Conservation |
op_relation |
Biological Conservation 2016, 199:16-24 urn:issn:0006-3207 http://hdl.handle.net/11250/2398333 https://doi.org/10.1016/j.biocon.2016.04.015 cristin:1355180 |
op_rights |
Navngivelse-DelPåSammeVilkår 3.0 Norge http://creativecommons.org/licenses/by-sa/3.0/no/ |
op_rightsnorm |
CC-BY-SA |
op_doi |
https://doi.org/10.1016/j.biocon.2016.04.015 |
container_title |
Biological Conservation |
container_volume |
199 |
container_start_page |
16 |
op_container_end_page |
24 |
_version_ |
1766402034784796672 |