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Hand dredging for the wedge clam (Donax trunculus) in the Algarve coast (southern Portugal): fishing yield, bycatch, discards and damage rates

2022-03Journal article Restricted access
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dc.contributor.authorNicolau, Lídia
dc.contributor.authorVasconcelos, Paulo
dc.contributor.authorCarvalho, André N.
dc.contributor.authorPereira, Fábio
dc.contributor.authorPiló, David
dc.contributor.authorSORDO, LAURA
dc.contributor.authorGaspar, Miguel
dc.date.accessioned2022-09-14T10:38:18Z
dc.date.available2022-09-14T10:38:18Z
dc.date.issued2022-03
dc.description.abstractThis study aimed to characterize the catches, quantify fishing yield, bycatch and discards, and also estimate damage and mortality rates using hand dredges with two different mesh sizes (20 and 25 mm) for harvesting the wedge clam (Donax trunculus). A total of 160 tows were performed in Lota Beach and Armona Island in the Algarve coast (southern Portugal). Overall, were caught 12,319 individuals (3985 in Lota Beach and 8334 in Armona Island) belonging to 48 taxa distributed among seven phyla (14 taxa in Lota Beach and 44 taxa in Armona Island). Bycatch proportions ranged from 13.1% to 32.0% in abundance and from 10.7% to 32.9% in biomass, with more bycatch using hand dredges with 20 mm mesh size. Commercially undersized D. trunculus (MCRS = 25 mm SL) prevailed within the bycatch, representing over 40% of discards using both mesh sizes. Due to different size selectivity, the target catch (CPUE) and bycatch per unit effort (BCPUE) in abundance and biomass, as well as fishing yield as a function of tow duration and towed area, were lower for hand dredges with 25 mm mesh than with 20 mm mesh. In general, damage and mortality rates were fairly low (1.3-2.6%) independently of mesh size, reinforcing the importance of releasing live bycatch to the sea immediately after sorting the catches. Overall, this study prompted the need to develop a good practice guide for hand dredgers, aiming to mitigate avoidable indirect discards mortality and improve the sustainability of this traditional harvesting activity.pt_PT
dc.description.sponsorshipIPMA-2018-008-BI; IPMA-2019-054A-BI; EMFF 2014–2020
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1080/17451000.2022.2048670pt_PT
dc.identifier.eissn1745-1019
dc.identifier.urihttp://hdl.handle.net/10400.1/18253
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherTaylor & Francispt_PT
dc.subjectManual harvestingpt_PT
dc.subjectFishing yieldpt_PT
dc.subjectBycatchpt_PT
dc.subjectDiscardspt_PT
dc.subjectFishing impactspt_PT
dc.subjectDamage scorept_PT
dc.titleHand dredging for the wedge clam (Donax trunculus) in the Algarve coast (southern Portugal): fishing yield, bycatch, discards and damage ratespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage977pt_PT
oaire.citation.issue9-10pt_PT
oaire.citation.startPage960pt_PT
oaire.citation.titleMarine Biology Researchpt_PT
oaire.citation.volume17pt_PT
person.familyNamePiló
person.familyNameSORDO
person.familyNameGaspar
person.givenNameDavid
person.givenNameLAURA
person.givenNameMiguel
person.identifier558340
person.identifier.ciencia-id291E-1F70-F443
person.identifier.ciencia-id6A17-AE94-6B54
person.identifier.ciencia-idF719-07AC-E41F
person.identifier.orcid0000-0002-1810-7135
person.identifier.orcid0000-0002-1045-2014
person.identifier.orcid0000-0001-9245-8518
person.identifier.ridF-5398-2011
person.identifier.scopus-author-id36052051100
person.identifier.scopus-author-id36987005700
person.identifier.scopus-author-id23501123500
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication27226467-30d4-4209-8bc7-e12b699c779f
relation.isAuthorOfPublicationbb733124-c46f-4a99-82ad-3ac2374964b9
relation.isAuthorOfPublication6185b7ee-acc9-4a7e-a7db-37384e94f4df
relation.isAuthorOfPublication.latestForDiscoverybb733124-c46f-4a99-82ad-3ac2374964b9

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