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dc.contributor.authorMyrseth, Johanna
dc.contributor.authorEnberg, Katja
dc.contributor.authorHeino, Mikko
dc.contributor.authorFiksen, Øyvind
dc.date.accessioned2012-01-02T14:32:13Z
dc.date.issued2011-03-22
dc.identifier.issn0890-8575
dc.identifier.urihttp://hdl.handle.net/11250/108460
dc.description.abstractFisheries managers normally make decisions based on stock abundance estimates subject to process, observation, and model uncertainties. Considerable effort is invested in gathering information about stock size to decrease these uncertainties. However, few studies have evaluated benefits from collecting such information in terms of yield and stability of annual harvest. Here, we develop a strategic age-structured population model for a long-lived fish with stochastic recruitment, resembling the Norwegian spring-spawning herring (NSSH, Clupea harengus L.). We evaluate how uncertainties in population estimates influence annual yield, spawning stock biomass (SSB), and variation in annual harvest, using both the proportional threshold harvesting (PTH) and the current harvest control rule for NSSH as harvest strategies. Results show that the consequences of a biased estimate are sensitive to the harvest strategy employed. If the harvest strategy is suitably chosen, the benefits of accurate information are low, and less information about the stock is necessary to maintain high average yield. Reduced harvest intensity effectively removes the need for accurate stock estimates. PTH (a variant of the constant escapement strategy) with low harvest ratio and the current NSSH harvest control rule both provide remarkable stability in yield and SSB. However, decreased uncertainty will often decrease year-to-year variation in harvest and the frequency of fishing moratoria.no_NO
dc.language.isoengno_NO
dc.publisherWiley Periodicalsno_NO
dc.subjectfisheries managementno_NO
dc.subjectfiskeriforvaltningno_NO
dc.subjectherringno_NO
dc.subjectsildno_NO
dc.titleDo accurate stock estimates increase harvest and reduce variability in fisheries yields?no_NO
dc.typeJournal articleno_NO
dc.typePeer reviewedno_NO
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921no_NO
dc.description.embargo10000-01-01
dc.source.pagenumber222-241no_NO
dc.source.volume24no_NO
dc.source.journalNatural Resource Modelingno_NO
dc.source.issue2no_NO
dc.identifier.doihttp://dx.doi.org/10.1111/j.1939-7445.2011.00089.x


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