Mortality of marine turtles bycaught in industrial fisheries operating off North-Western Africa

We use data collected by onboard observers to assess the bycatch and immediate mortality of sea turtles in the Canary Current Large Marine Ecosystem (CCLME) and adjoining areas from 2016 to 2021. First, a dataset including 698 sets by drifting longliners, 6300 tows by trawlers and 1029 sets by purse...

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Autores: Cardona Pascual, Luis, March, David, Báez, José Carlos, Rey, Javier, Diame, Ahmed, García-Barcelona, Salvador, Salmerón, Francisca, Ba, Omar, Fernandez-Peralta, Lourdes, Báez-Linero, Pablo, Barbosa, Nadito, Macías, David, González-Solís, Jacob
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2025
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/219809
Acceso en línea:https://hdl.handle.net/2445/219809
Access Level:acceso abierto
Palabra clave:Àfrica occidental
Embarcacions
Influència de l'home en la natura
Pesca
Tortugues marines
West Africa
Boats and boating
Effect of human beings on nature
Fishing
Sea turtles
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spelling Mortality of marine turtles bycaught in industrial fisheries operating off North-Western AfricaCardona Pascual, LuisMarch, DavidBáez, José CarlosRey, JavierDiame, AhmedGarcía-Barcelona, SalvadorSalmerón, FranciscaBa, OmarFernandez-Peralta, LourdesBáez-Linero, PabloBarbosa, NaditoMacías, DavidGonzález-Solís, JacobÀfrica occidentalEmbarcacionsInfluència de l'home en la naturaPescaTortugues marinesWest AfricaBoats and boatingEffect of human beings on natureFishingSea turtlesWe use data collected by onboard observers to assess the bycatch and immediate mortality of sea turtles in the Canary Current Large Marine Ecosystem (CCLME) and adjoining areas from 2016 to 2021. First, a dataset including 698 sets by drifting longliners, 6300 tows by trawlers and 1029 sets by purse seiners was used to calculate the catch per unit of effort for each species and fleet. Second, effort data compiled by the International Commission for the Conservation of Atlantic Tunas (ICCAT) and Global Fishing Watch were used to escalate bycatch to the whole fleet. Third, we used post-release mortality rates from the literature to estimate the total number of turtles killed annually and provide a baseline to assess their potential demographic impact. Accordingly, the international fleet of longliners was estimated to cause the annual mortality of 6800 loggerhead turtles Caretta caretta (95% CI: 5825–7628), 740 olive ridley turtles Lepidochelys olivacea (95% CI: 560–926) and smaller numbers of hawksbill Eretmochelys imbricate and green turtles Chelonia mydas. Nothing is known about the post release mortality rate of leatherback turtles, but bycatch was estimated as 3529 leatherback turtles (95% CI: 2463–4889). Regarding bottom trawling, the whole fleet was estimated to case annually the death of 151 green turtles (95% CI: 67–191), 95 loggerhead turtles (95% CI:33–108) and 42 olive ridley turtles (95% CI: 23–87). Finally, purse seiners were estimated to cause negligible mortality to loggerhead and leatherback turtles, the only species bycaught by that fleet. Our study provides comprehensive and precise baseline data on sea turtle bycatch within the three main industrial fishing activities, crucial for understanding the demographic impacts on sea turtle populations. Moreover, it underscores the CCLME as a significant hotspot for marine megafauna bycatch.John Wiley & Sons2025202620252025info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion10 p.application/pdfhttps://hdl.handle.net/2445/219809Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: https://doi.org/10.1002/aqc.70099Aquatic Conservation-Marine and Freshwater Ecosystems, 2025, vol. 35, num.3, p. 1-10https://doi.org/10.1002/aqc.70099(c) John Wiley & Sons, 2025info:eu-repo/semantics/openAccessoai:recercat.cat:2445/2198092026-05-29T05:05:01Z
dc.title.none.fl_str_mv Mortality of marine turtles bycaught in industrial fisheries operating off North-Western Africa
title Mortality of marine turtles bycaught in industrial fisheries operating off North-Western Africa
spellingShingle Mortality of marine turtles bycaught in industrial fisheries operating off North-Western Africa
Cardona Pascual, Luis
Àfrica occidental
Embarcacions
Influència de l'home en la natura
Pesca
Tortugues marines
West Africa
Boats and boating
Effect of human beings on nature
Fishing
Sea turtles
title_short Mortality of marine turtles bycaught in industrial fisheries operating off North-Western Africa
title_full Mortality of marine turtles bycaught in industrial fisheries operating off North-Western Africa
title_fullStr Mortality of marine turtles bycaught in industrial fisheries operating off North-Western Africa
title_full_unstemmed Mortality of marine turtles bycaught in industrial fisheries operating off North-Western Africa
title_sort Mortality of marine turtles bycaught in industrial fisheries operating off North-Western Africa
dc.creator.none.fl_str_mv Cardona Pascual, Luis
March, David
Báez, José Carlos
Rey, Javier
Diame, Ahmed
García-Barcelona, Salvador
Salmerón, Francisca
Ba, Omar
Fernandez-Peralta, Lourdes
Báez-Linero, Pablo
Barbosa, Nadito
Macías, David
González-Solís, Jacob
author Cardona Pascual, Luis
author_facet Cardona Pascual, Luis
March, David
Báez, José Carlos
Rey, Javier
Diame, Ahmed
García-Barcelona, Salvador
Salmerón, Francisca
Ba, Omar
Fernandez-Peralta, Lourdes
Báez-Linero, Pablo
Barbosa, Nadito
Macías, David
González-Solís, Jacob
author_role author
author2 March, David
Báez, José Carlos
Rey, Javier
Diame, Ahmed
García-Barcelona, Salvador
Salmerón, Francisca
Ba, Omar
Fernandez-Peralta, Lourdes
Báez-Linero, Pablo
Barbosa, Nadito
Macías, David
González-Solís, Jacob
author2_role author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Àfrica occidental
Embarcacions
Influència de l'home en la natura
Pesca
Tortugues marines
West Africa
Boats and boating
Effect of human beings on nature
Fishing
Sea turtles
topic Àfrica occidental
Embarcacions
Influència de l'home en la natura
Pesca
Tortugues marines
West Africa
Boats and boating
Effect of human beings on nature
Fishing
Sea turtles
description We use data collected by onboard observers to assess the bycatch and immediate mortality of sea turtles in the Canary Current Large Marine Ecosystem (CCLME) and adjoining areas from 2016 to 2021. First, a dataset including 698 sets by drifting longliners, 6300 tows by trawlers and 1029 sets by purse seiners was used to calculate the catch per unit of effort for each species and fleet. Second, effort data compiled by the International Commission for the Conservation of Atlantic Tunas (ICCAT) and Global Fishing Watch were used to escalate bycatch to the whole fleet. Third, we used post-release mortality rates from the literature to estimate the total number of turtles killed annually and provide a baseline to assess their potential demographic impact. Accordingly, the international fleet of longliners was estimated to cause the annual mortality of 6800 loggerhead turtles Caretta caretta (95% CI: 5825–7628), 740 olive ridley turtles Lepidochelys olivacea (95% CI: 560–926) and smaller numbers of hawksbill Eretmochelys imbricate and green turtles Chelonia mydas. Nothing is known about the post release mortality rate of leatherback turtles, but bycatch was estimated as 3529 leatherback turtles (95% CI: 2463–4889). Regarding bottom trawling, the whole fleet was estimated to case annually the death of 151 green turtles (95% CI: 67–191), 95 loggerhead turtles (95% CI:33–108) and 42 olive ridley turtles (95% CI: 23–87). Finally, purse seiners were estimated to cause negligible mortality to loggerhead and leatherback turtles, the only species bycaught by that fleet. Our study provides comprehensive and precise baseline data on sea turtle bycatch within the three main industrial fishing activities, crucial for understanding the demographic impacts on sea turtle populations. Moreover, it underscores the CCLME as a significant hotspot for marine megafauna bycatch.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/219809
url https://hdl.handle.net/2445/219809
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1002/aqc.70099
Aquatic Conservation-Marine and Freshwater Ecosystems, 2025, vol. 35, num.3, p. 1-10
https://doi.org/10.1002/aqc.70099
dc.rights.none.fl_str_mv (c) John Wiley & Sons, 2025
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) John Wiley & Sons, 2025
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 10 p.
application/pdf
dc.publisher.none.fl_str_mv John Wiley & Sons
publisher.none.fl_str_mv John Wiley & Sons
dc.source.none.fl_str_mv Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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