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Mitigation measures to reduce seabird's interactions with bottom-set nets in southern Iberia

2025-09Artigo científico Acesso aberto
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dc.contributor.authorFrade, Magda
dc.contributor.authorCarvalho, Flávia
dc.contributor.authorSamel, Vighnesh Nilesh
dc.contributor.authorOliveira, Nuno
dc.contributor.authorAndrade, Joana
dc.contributor.authorGonçalves, Jorge Manuel Santos
dc.contributor.authorMarçalo, Ana
dc.date.accessioned2025-07-17T09:01:13Z
dc.date.available2025-07-17T09:01:13Z
dc.date.issued2025-09
dc.description.abstractBycatch poses a significant threat to seabird populations globally. On the southern coast of mainland Portugal, mitigation measures were tested to reduce seabird interactions with fishing vessels. Between 2021 and 2023, this study evaluated the effectiveness of a visual deterrent (a ’scarybird’ device), an acoustic deterrent (megaphone broadcasts), alongside modification in fisher’s behaviour discard management— avoiding discards during fishing operations to minimize seabird interactions. Observers monitored 166 fishing events, comparing control and experimental treatments. Discard management was the most effective deterrent, significantly reducing seabird abundance, particularly gulls (Larus spp.) and northern gannets (Morus bassanus). Model predictions indicated a 37 % and a 47 % reduction in the abundance of gulls and northern gannets, respectively, around commercial fishing vessels when discard management was used. This practice effectively kept a substantial proportion of birds away from the vessel during operations, thereby reducing their vulnerability to bycatch. The megaphone showed limited efficacy, with higher seabird abundance in treatment groups compared to controls. The scarybird device was largely ineffective in deterring gulls unless combined with discard management but showed potential in reducing interactions with northern gannets. Importantly, all mitigation measures did not negatively impact Landings Per Unit Effort (LPUE), which facilitated their acceptance among fishers. Our findings suggest that simple modifications in the fisher’s behaviour, such as retaining fish discards and viscera onboard, could serve as a promising bycatch mitigation measure, potentially eliminating the need for additional less effective mitigation devices that fishers may be reluctant to adopt.eng
dc.description.sponsorshipLIFE18/NAT/PT/000927
dc.identifier.doi10.1016/j.ocecoaman.2025.107767
dc.identifier.issn0964-5691
dc.identifier.urihttp://hdl.handle.net/10400.1/27428
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationAlgarve Centre for Marine Sciences
dc.relationAlgarve Centre for Marine Sciences
dc.relationCentre for Marine and Environmental Research
dc.relation.ispartofOcean & Coastal Management
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectBottom-set nets
dc.subjectSeabird
dc.subjectFishery interactions
dc.subjectAcoustic deterrent
dc.subjectScarybird device
dc.subjectDiscard management
dc.titleMitigation measures to reduce seabird's interactions with bottom-set nets in southern Iberiaeng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleCentre for Marine and Environmental Research
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.citation.startPage107767
oaire.citation.titleOcean and Coastal Management
oaire.citation.volume268
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameFrade
person.familyNameCarvalho
person.familyNameSamel
person.familyNameGonçalves
person.familyNameMarçalo
person.givenNameMagda
person.givenNameFlávia
person.givenNameVighnesh Nilesh
person.givenNameJorge Manuel Santos
person.givenNameAna
person.identifier356846
person.identifierR-000-JHM
person.identifier.ciencia-idAF1E-14EE-DADC
person.identifier.ciencia-id1013-ED6A-65EB
person.identifier.ciencia-id7314-E2C4-78A2
person.identifier.orcid0000-0002-4006-5648
person.identifier.orcid0009-0001-2751-7689
person.identifier.orcid0000-0001-7704-8190
person.identifier.orcid0000-0002-0485-341X
person.identifier.ridG-5206-2011
person.identifier.scopus-author-id7103326116
person.identifier.scopus-author-id6505855915
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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