Repository logo
 
Publication

Further improvements in sorting grids for the crustacean trawl fishery off the Southern coast of Portugal

2019-11Journal article Restricted access
Simple item page
dc.contributor.authorMillar, Russell B.
dc.contributor.authorBarros, Luisa
dc.contributor.authorFonseca, Paulo
dc.contributor.authorSantos, Paulo T.
dc.contributor.authorCampos, Aida
dc.date.accessioned2020-07-24T10:51:08Z
dc.date.available2020-07-24T10:51:08Z
dc.date.issued2019-11
dc.description.abstractBottom-trawl fishing for crustaceans off the Portuguese south and southwest coasts is a very important segment of the Portuguese fishing fleet, where annual rates of discarding have ranged from approximately 38% to as much as 70% of the total catch. Past experiments to address this problem encompassed the testing of different codend mesh sizes and configurations, square mesh windows and rigid grids to enhance species and size-selectivity. While the use of a Nordmore grid has proved quite efficient in separating out blue whiting (Micromesistius poutassou), it also led to some losses of the two main crustacean target species, Norway lobster (Nephrops norvegicus) and rose shrimp (Parapenaeus longirostris). The present study addresses that limitation by using a modified grid with 20 mm bar spacing and two open sections, designed with the purpose of separating fish and crustacean species into upper and lower codends. Good separation was achieved, with about 80% of the blue whiting (in number) directed towards the upper trawl section and caught in the upper codend, while a similar percentage of Norway lobster was caught in the lower codend. The grid bars had 50% retention for Norway lobster at 34.1 mm carapace length. The results herein will enable this gear configuration to be finetuned with regard to codend mesh sizes and bar spacing, so as to optimize both retention of Norway lobster and exclusion of blue whiting. For example, compared to using the minimum 70 mm diamond mesh size, using an 80 nun diamond mesh upper codend would reduce Norway lobster catch weight by just 1.6% but reduce the number of blue whiting caught by 42%.
dc.description.sponsorship[22-05-01-FDR-00014]
dc.identifier.doi10.1016/j.fishres.2019.105329
dc.identifier.issn0165-7836
dc.identifier.issn1872-6763
dc.identifier.urihttp://hdl.handle.net/10400.1/14200
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.subjectLobster Nephrops-Norvegicus
dc.subjectMesh cod ends
dc.subjectSize-selectivity
dc.subjectNorway lobster
dc.subjectBy-catch
dc.subjectBottom trawl
dc.subjectGear
dc.subjectReduction
dc.subjectDiscards
dc.subjectDiamond
dc.titleFurther improvements in sorting grids for the crustacean trawl fishery off the Southern coast of Portugal
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPageUNSP 105329
oaire.citation.titleFisheries Research
oaire.citation.volume219
person.familyNameFonseca
person.familyNameCampos
person.givenNamePaulo
person.givenNameAida
person.identifier205567
person.identifier134652
person.identifier.ciencia-id4216-8ECA-1B1C
person.identifier.ciencia-idFD1D-549D-6B28
person.identifier.orcid0000-0003-4177-8196
person.identifier.orcid0000-0002-5972-6266
person.identifier.ridA-5418-2008
person.identifier.ridA-3984-2012
person.identifier.scopus-author-id36336748800
person.identifier.scopus-author-id7202214975
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublication24be50bb-dfb8-4f44-9803-5ca1d9e80d81
relation.isAuthorOfPublication8db52a03-420d-4974-bdc4-0a431577ac1c
relation.isAuthorOfPublication.latestForDiscovery8db52a03-420d-4974-bdc4-0a431577ac1c

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
1-s2.0-S0165783619301845-main.pdf
Size:
1 MB
Format:
Adobe Portable Document Format
Download

Collections

CCM2-Artigos (em revistas ou actas indexadas)