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Effects of gear modifications in a North Atlantic pelagic longline fishery: A multiyear study

2023Journal article Open access
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dc.contributor.authorLima, Françoise
dc.contributor.authorParra, Hugo
dc.contributor.authorAlves, Rita B.
dc.contributor.authorSantos, Marco A. R.
dc.contributor.authorBjorndal, Karen
dc.contributor.authorBolten, Alan B.
dc.contributor.authorVandeperre, Frederic
dc.date.accessioned2024-03-05T16:37:26Z
dc.date.available2024-03-05T16:37:26Z
dc.date.issued2023
dc.description.abstractThe threat of population declines caused by pelagic longline fisheries in the Atlantic has increased the concern to find strategies that minimize the bycatch and mortality of non-target marine animals. Gear modification, such as the use of circle hooks instead of conventional J-hooks, has been identified as an effective bycatch reduction strategy in different pelagic longline fisheries around the world. This study aimed to verify the effectiveness of the use of circle hooks by quantifying catch rates, relative size selectivity, and anatomical hooking position for the most common target species (swordfish, Xiphias gladius, and blue shark, Prionace glauca), and some bycatch species (loggerhead sea turtles, Caretta caretta, and shortfin mako, Isurus oxyrinchus) caught by the Azorean longline fishing fleet. The trial was conducted for five consecutive years (2000–2004) using eight different types of hooks. In general, the blue shark catches using circle hooks were significantly higher compared to J (Mustad 9/0). The circle hooks also showed high probabilities of catching juvenile blue sharks. Conversely, the circle hooks were efficient in reducing the loggerhead sea turtle bycatch and were related to fewer catches of small sea turtle individuals. The use of circle hooks was also associated with reduced swordfish catches compared to J (Mustad 9/0), and the effect of hook types on length at capture was only significant for Circle (L. & P. 18/0 —CLP18) and Ringed Tuna (RT). No significant differences were observed comparing hook type to either catch rates or size selectivity for shortfin mako. Additionally, circle hooks were more likely to lodge in the mouth than in deeper anatomical positions, when compared to J (Mustad 9/0), for the four species analysed. The present study demonstrated that the use of circle hooks could mitigate the impact of the pelagic longline fisheries in the Azores by decreasing the bycatch of sea turtles and reducing animal injuries caused by deep hooking.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationLima FD, Parra H, Alves RB, Santos MAR, Bjorndal KA, Bolten AB, et al. (2023) Effects of gear modifications in a North Atlantic pelagic longline fishery: A multiyear study. PLoS ONE 18(10): e0292727. https://doi.org/10.1371/journal. pone.0292727pt_PT
dc.identifier.doi10.1371/journal.pone.0292727pt_PT
dc.identifier.issn19326203
dc.identifier.urihttp://hdl.handle.net/10400.12/9647
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherPublic Library of Sciencept_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.titleEffects of gear modifications in a North Atlantic pelagic longline fishery: A multiyear studypt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceUnited Statespt_PT
oaire.citation.issue10pt_PT
oaire.citation.startPagee0292727pt_PT
oaire.citation.titlePLOS ONEpt_PT
oaire.citation.volume18pt_PT
person.familyNameLima
person.familyNameBjorndal
person.familyNameVandeperre
person.givenNameFrançoise
person.givenNameKaren
person.givenNameFrederic
person.identifier803058
person.identifier.ciencia-id6F18-F56B-E2EE
person.identifier.ciencia-idED17-B8AE-2622
person.identifier.orcid0000-0002-9968-4806
person.identifier.orcid0000-0002-6286-1901
person.identifier.orcid0000-0002-3947-6917
person.identifier.scopus-author-id7007065666
person.identifier.scopus-author-id23996117300
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication3ad6be2b-c85a-4631-9031-3097f15dde56
relation.isAuthorOfPublicationafa5e0d8-877e-4884-a6e9-ba316ad3e008
relation.isAuthorOfPublicationdba92bad-65ba-45a8-bd5f-06407ab0944f
relation.isAuthorOfPublication.latestForDiscoveryafa5e0d8-877e-4884-a6e9-ba316ad3e008

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