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The effect of light attractor color in pelagic longline fisheries

2021Journal article Restricted access
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dc.contributor.authorAfonso, André S.
dc.contributor.authorMourato, Bruno
dc.contributor.authorHazin, Humberto
dc.contributor.authorHazin, Fábio H.V.
dc.date.accessioned2021-08-03T13:29:58Z
dc.date.available2021-08-03T13:29:58Z
dc.date.issued2021
dc.descriptionThe authors acknowledge funding provided by Financiadora de Estudos e Projetos – FINEP, Coordenaçao ˜ para o Aperfeiçoamento de Pessoal do Ensino Superior – CAPES CIMAR-II, Conselho Nacional de Desenvolvimento Científico e Tecnologico ´ – CNPq (ref. 445810/2015- 7), Fundaçao ˜ para a Ciˆencia e Tecnologia – FCT (ref. UID/ MAR/ 04292/2013), and the Integrated Programme of SR&TD “Smart Valorization of Endogenous Marine Biological Resources Under a Changing Climate” (ref. Centro-01-0145-FEDER-000018), co-funded by Centro 2020 program, Portugal 2020 and European Union through the European Regional Development Fund. The authors are deeply thankful to two anonymous reviewers who helped to improve the overall quality of the manuscript.
dc.description.abstractImproving the selectivity of the fishing gear is one of the most promising methods to mitigate deleterious impacts of longline fisheries upon bycatch species. Light lures have recently become widespread in epipelagic longline fisheries since they increase the catch rates of valuable target species such as swordfish and tunas. Yet, little is known about their effect upon the incidence of bycatch. Here, we compared the catchability of target and bycatch species in a pelagic longline fishery targeting swordfish and tunas equipped with light attractors with three different colors to ascertain if any of the light attractor colors would enhance the selectivity of the fishing gear. A total of 3488 individuals were caught across 57 fishing sets. The proportion of target species to bycatch species was high (58–65 %) in each color treatment. Overall, green attractors (peak wavelength at 525 nm) exhibited the highest catch rates of target species, but they were also responsible for the highest incidence of bycatch, rendering 73 % and 82 % of the blue shark and sea turtle catch, respectively. Blue (peak wavelength at 465 nm) and white attractors caught significantly less individuals of both target and bycatch species. Further, significant interactions between light attractor color and the intensity of lunar illumination were observed for most species analyzed. Differences in the catchability of bycatch such as blue sharks and white marlins across attractor color treatments were more conspicuous at high lunar illumination levels (i.e. full moon periods), when white attractors rendered the lowest catch of these taxa. In contrast, the catchability of target species such as swordfish, yellowfin tuna and albacore showed greater differences between treatments at low illumination levels (i.e. new moon periods). The observed differences in the performance of the three light attractor colors across the lunar cycle might provide an opportunity to mitigate bycatch incidence in longline fisheries. Yet, further research is required to fully understand the combined effects of light lures and lunar illumination on the behavioral responses of pelagic species.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationAndré S. Afonso, Bruno Mourato, Humberto Hazin, Fábio H.V. Hazin, The effect of light attractor color in pelagic longline fisheries, Fisheries Research, Volume 235, 2021, 105822, ISSN 0165-7836, https://doi.org/10.1016/j.fishres.2020.105822.pt_PT
dc.identifier.doi10.1016/j.fishres.2020.105822pt_PT
dc.identifier.issn0165-7836
dc.identifier.urihttp://hdl.handle.net/10400.8/5994
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationMARE - Marine and Environmental Sciences Centre
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0165783620303398pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectBycatch mitigationpt_PT
dc.subjectConservationpt_PT
dc.subjectFish attractorpt_PT
dc.subjectLongline selectivitypt_PT
dc.subjectTuna fisheriespt_PT
dc.titleThe effect of light attractor color in pelagic longline fisheriespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleMARE - Marine and Environmental Sciences Centre
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FMAR%2F04292%2F2013/PT
oaire.citation.titleFisheries Researchpt_PT
oaire.citation.volume235pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameAfonso
person.givenNameAndré
person.identifier.ciencia-idB513-502C-1865
person.identifier.orcid0000-0001-9129-278X
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication.latestForDiscoveryfde63fd9-65a7-49bc-8acd-3ece6cfb9798
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