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The influence of dredge design on the catch of Callista chione (Linnaeus, 1758)

2001Journal article Restricted access
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dc.contributor.authorGaspar, Miguel
dc.contributor.authorDias, M. D.
dc.contributor.authorCampos, Aida
dc.contributor.authorMonteiro, C. C.
dc.contributor.authorSantos, M. N.
dc.contributor.authorTeodosio, Maria
dc.contributor.authorChícharo, Luís
dc.date.accessioned2013-02-27T15:15:39Z
dc.date.available2013-02-27T15:15:39Z
dc.date.issued2001
dc.date.updated2013-02-19T16:28:15Z
dc.description.abstractTo evaluate a possible introduction of a new dredge in the fishery of Callista chione (Linnaeus, 1758), IPIMAR has conducted a study with the objective of comparing the efficiency of two dredges (traditional dredge and the new dredge design) and evaluating their impact on the benthic community. The experiments were carried out during March 1999 on the Southwest coast of Portugal, from a site off Troia. Three different tow durations of 5, 10 and 20 min were investigated. A total of 24 hauls were accomplished, 4 for each tow duration and dredge. The experiments were conducted by attaching a cover bag with a 20 mm mesh to the gear. After each haul, the catches in the bag and in the cover were sorted separately. All individuals retained were attributed scores on a scale of 1–4 in which 1 equates to good and 4 equates to dead. The results obtained showed that catches from the traditional dredge (TD) are composed of a great fraction of juveniles of C. chione, while in the new dredge (NDD) catches are composed, almost entirely, by individuals with a superior size to the minimum legal length (50 mm). This result indicates that the mesh of the bag of the TD used in the exploitation of this resource is not adequate. For the 3 different tow durations, the mean fishing yield obtained for the NDD was always superior to the TD, due to its greater efficiency in capture. The proportion of by-catch is significantly higher when the TD is used. For all 3 tow duration, the TD caused mortalities on the target species and on the macrobenthic community in the same order of magnitude as the NDD. Since the fishery of C. chione is managed by daily quotas per boat, when using the NDD the impact on the macrobenthic community is reduced by about 50% due to its greater efficiency of capture. Another advantage in the usage of the NDD relatively to the TD, is to allow the smallest individuals (independently of the species) to escape rapidly through the metallic bars on the grid, increasing their probability of survival.por
dc.identifier.citationGaspar, M. B.; Dias, M. D.; Campos, A.; Monteiro, C. C.; Santos, M. N.; Chicharo, A.; Chicharo, L. M. Z. The influence of dredge design on the catch of Callista chione (Linnaeus, 1758), Hydrobiologia, 465, 1-3, 153-167, 2001.por
dc.identifier.issn0018-8158
dc.identifier.otherAUT: MCH00377;
dc.identifier.urihttp://hdl.handle.net/10400.1/2498
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherKluwerpor
dc.subjectDredgepor
dc.subjectFishery impactpor
dc.subjectCallista chionepor
dc.subjectMortalitypor
dc.subjectBy-catchpor
dc.subjectPharuspor
dc.titleThe influence of dredge design on the catch of Callista chione (Linnaeus, 1758)por
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage167por
oaire.citation.issue1-3por
oaire.citation.startPage153por
oaire.citation.titleHydrobiologiapor
oaire.citation.volume465por
person.familyNameGaspar
person.familyNameCampos
person.familyNameTeodosio
person.familyNameChicharo
person.givenNameMiguel
person.givenNameAida
person.givenNameMaria
person.givenNameLuis
person.identifier134652
person.identifier.ciencia-idF719-07AC-E41F
person.identifier.ciencia-idFD1D-549D-6B28
person.identifier.ciencia-idAF10-647B-65FB
person.identifier.ciencia-id6716-EE1C-B995
person.identifier.orcid0000-0001-9245-8518
person.identifier.orcid0000-0002-5972-6266
person.identifier.orcid0000-0002-0939-9885
person.identifier.orcid0000-0002-4933-2300
person.identifier.ridF-5398-2011
person.identifier.ridA-3984-2012
person.identifier.ridB-5077-2013
person.identifier.scopus-author-id23501123500
person.identifier.scopus-author-id7202214975
person.identifier.scopus-author-id56196396700
person.identifier.scopus-author-id6602881426
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
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relation.isAuthorOfPublication.latestForDiscoveryb39b2d6d-d6f5-4130-a9b9-4e7624d44676

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