Repository logo
 
Publication

Standardized CPUE of blue shark in the Portuguese pelagic longline fleet operating in the north Atlantic

2016Working paper Open access
Simple item page
dc.contributor.authorCoelho, Rui
dc.contributor.authorSantos, Miguel
dc.contributor.authorLino, Pedro
dc.date.accessioned2020-12-04T11:50:27Z
dc.date.available2020-12-04T11:50:27Z
dc.date.issued2016
dc.description.abstractThis working document analyzes the catch, effort and standardized CPUE trends for the north Atlantic blue shark captured by the Portuguese pelagic longline fleet. Nominal annual CPUE were calculated as kg/1000 hooks and were standardized with Generalized Linear Models (GLM) and Generalized Linear Mixed Models (GLMM) using year, quarter, area, gear type, targeting effects and area:quarter interactions as fixed factors, and year:area as random effects. Sensitivity analyzes were carried out for the model type (lognormal, tweedie, gamma or delta lognormal), the definition of targeting effects (based on ratios or cluster analysis), and definition of areas. Model goodness-of-fit and comparison was carried out with AIC and the pseudo coefficient of determination (R2 ), and model validation with a residual analysis. The final standardized CPUE trend shows a general increase over the studied period, between 1997 and 2014, with some inter-annual oscillations. This paper presents the first index of abundance for the blue shark estimated from captures from the Portuguese pelagic longline fleet in the North Atlantic, and can be used in future stock assessments models.pt_PT
dc.description.sponsorshipFCT IF/00253/2014pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.urihttp://hdl.handle.net/10400.1/14883
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherICCAT - International Commission for the Conservation of Atlantic Tunaspt_PT
dc.relation.publisherversionhttps://www.iccat.int/Documents/CVSP/CV072_2016/n_4/CV072041044.pdfpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/pt_PT
dc.subjectBlue sharkpt_PT
dc.subjectPrionace glaucapt_PT
dc.subjectCPUE standardizationpt_PT
dc.subjectNorth Atlanticpt_PT
dc.subjectCatch/effortpt_PT
dc.subjectLongline fisheriespt_PT
dc.subjectFishery indicatorspt_PT
dc.subjectGeneralized linear modelspt_PT
dc.subjectGeneralized linear mixed modelspt_PT
dc.titleStandardized CPUE of blue shark in the Portuguese pelagic longline fleet operating in the north Atlanticpt_PT
dc.typeworking paper
dspace.entity.typePublication
oaire.citation.endPage1066pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage1044pt_PT
oaire.citation.titleCollective Volume of Scientific Papers ICCATpt_PT
oaire.citation.volume72pt_PT
person.familyNameCoelho
person.givenNameRui
person.identifier134638
person.identifier.ciencia-idDC1A-20B7-EAC0
person.identifier.orcid0000-0003-3813-5157
person.identifier.ridC-1163-2008
person.identifier.scopus-author-id56257111100
rcaap.rightsopenAccesspt_PT
rcaap.typeworkingPaperpt_PT
relation.isAuthorOfPublication6366aa1b-1301-43a3-b2b0-1280311ac95f
relation.isAuthorOfPublication.latestForDiscovery6366aa1b-1301-43a3-b2b0-1280311ac95f

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
29_Coelho_etal_2016_BSH-CPUE-Stdz_ICCAT.pdf
Size:
941.97 KB
Format:
Adobe Portable Document Format
Download

Collections

CCM4-Vários