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Reducing discards in a demersal purse-seine fishery

2008Journal article Open access
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dc.contributor.authorGonçalves, J. M. S.
dc.contributor.authorBentes, L.
dc.contributor.authorMonteiro, P.
dc.contributor.authorCoelho, R.
dc.contributor.authorCorado, M.
dc.contributor.authorErzini, Karim
dc.date.accessioned2016-12-14T16:22:28Z
dc.date.available2016-12-14T16:22:28Z
dc.date.issued2008
dc.description.abstractFisheries bycatches and discards constitute a significant problem in many fisheries worldwide. Unlike the pelagic purse-seine, the demersal purse seine usually targets high commercial value demersal species such as sea breams ( e. g., Diplodus spp., Pagellus spp., Sparus aurata) and the European sea bass ( Dicentrarchus labrax), while discards consist mainly of pelagic species and juveniles of the above mentioned species. In order to evaluate the efficiency of a selectivity device in reducing bycatch and consequently of discards in a demersal purse seine fishery, experimental deployments were carried out. The bycatch reducing device (BRD) consisted in the use of a panel of diamond-shaped mesh netting of 70 mm stretched mesh in the posterior part of the purse seine. Data from 61 experimental fishing trials allowed the evaluation of discards, with Scomber japonicus, Boops boops, Sardina pilchardus, Diplodus bellottii and Belone belone being the main discarded species. The mean discard ratio per set was 0.49 (+/- 0.30 standard deviation). The causes for discarding were also identified, with low commercial value being the most important reason. The results of the trials with BRD, were promising, with an average of 49% (+/- 24%) of the fish escaping per set, especially from those species that are most discarded. Overall, the use of this method for reducing discards can be considered positive for the following reasons: there is no need for structural modification of the fishing gear, the BRD is easy to deploy, and it is efficient in terms of species, sizes and quantities of fish that manage to escape. It therefore has significant benefits for the demersal purse seine fishery and possibly for other "metiers" as well.
dc.identifier.doi10.1051/alr:2008023
dc.identifier.issn0990-7440
dc.identifier.otherAUT: JGO02808; KER00534;
dc.identifier.urihttp://hdl.handle.net/10400.1/8818
dc.language.isoeng
dc.peerreviewedyes
dc.publisherEDP Sciences. Cambridge University Press
dc.relation.isbasedonWOS:000257320200005
dc.subjectBycatch reducing device
dc.subjectDiscard
dc.subjectFishing impact
dc.subjectGear selectivity
dc.subjectFisheries management
dc.titleReducing discards in a demersal purse-seine fishery
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage144
oaire.citation.issue2
oaire.citation.startPage135
oaire.citation.titleAquatic Living Resources
oaire.citation.volume21
person.familyNameGonçalves
person.familyNameBentes
person.familyNameMonteiro
person.familyNameCoelho
person.familyNameErzini
person.givenNameJorge Manuel Santos
person.givenNameLuis
person.givenNamePedro
person.givenNameRui
person.givenNameKarim
person.identifier356846
person.identifier134638
person.identifier.ciencia-id1013-ED6A-65EB
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person.identifier.ridG-5206-2011
person.identifier.ridD-5057-2009
person.identifier.ridD-4995-2009
person.identifier.ridC-1163-2008
person.identifier.ridM-5216-2013
person.identifier.scopus-author-id7103326116
person.identifier.scopus-author-id6603195176
person.identifier.scopus-author-id56257111100
person.identifier.scopus-author-id7004015948
rcaap.rightsopenAccess
rcaap.typearticle
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