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dc.contributor.authorZimmermann, Fabian
dc.contributor.authorEnberg, Katja
dc.date.accessioned2016-08-12T12:16:53Z
dc.date.accessioned2016-08-16T11:35:14Z
dc.date.available2016-08-12T12:16:53Z
dc.date.available2016-08-16T11:35:14Z
dc.date.issued2016-08-07
dc.identifier.citationICES Journal of Marine Science 2016nb_NO
dc.identifier.issn1095-9289
dc.identifier.urihttp://hdl.handle.net/11250/2399364
dc.description-nb_NO
dc.description.abstractUncertain and inaccurate estimates are a prevailing problem in stock assessment, despite increasingly sophisticated estimation methods and substantial usage of scientific and financial resources. Annual scientific surveys and assessment group meetings require frequent use of research vessels and skilled research staff and are, therefore, particularly costly. This data- and work-intensive approach is often considered paramount for reliable stock estimates and risk management. However, it remains an open question whether the benefits of increasing assessment effort outweigh its marginal costs, or whether the potential impacts of investing less in assessments could generate net benefits. In this study, we explore how different scenarios of reduced survey and assessment frequencies affect estimated stock biomass, predicted catch, and uncertainty. Data of two Northeast Atlantic stocks, blue whiting (Micromesistius poutassou) and Norwegian spring-spawning herring (Clupea harengus), and a widely applied stock assessment model are used to compare the impacts of removing surveys and/or annual assessments. The results show that lower survey and/or assessment frequencies tend to result in deviating estimates of spawning-stock biomass and catch and larger confidence intervals, the observed differences being, however, mostly small. While scenarios without a survey datapoint in the assessment year generally produced the largest deviations in estimates, biannual surveys in general did not affect assessment performance substantially. This indicates that a reduced frequency of surveys and assessments could be an acceptable measure to reduce assessment costs and increase the efficiency of fisheries management, particularly when accompanied by thorough management strategy evaluations and risk assessments.nb_NO
dc.language.isoengnb_NO
dc.publisherOxford Journalsnb_NO
dc.relation.urihttp://icesjms.oxfordjournals.org/cgi/content/full/fsw134? ijkey=tGYPluXgkS4wnFC&keytype=ref
dc.rightsNavngivelse-DelPåSammeVilkår 3.0 Norge*
dc.rights.urihttp://creativecommons.org/licenses/by-sa/3.0/no/*
dc.titleCan less be more? Effects of reduced frequency of surveys andstock assessmentsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.date.updated2016-08-12T12:16:53Z
dc.source.pagenumber13 s.nb_NO
dc.source.journalICES Journal of Marine Sciencenb_NO
dc.identifier.doi10.1093/icesjms/fsw134
dc.identifier.cristin1372408


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