A scientific alternative to moratoria for rebuilding depleted international tuna stocks

dc.contributor.authorHillary, Richard M
dc.contributor.authorPreece, Ann L
dc.contributor.authorDavies, Campbell R
dc.contributor.authorKurota, Hiroyuki
dc.contributor.authorSakai, Osamu
dc.contributor.authorItoh, Tomoyuki
dc.contributor.authorParma, Ana M
dc.contributor.authorButterworth, Doug S
dc.contributor.authorIanelli, James
dc.contributor.authorBranch, Trevor A
dc.date.accessioned2017-03-03T11:00:53Z
dc.date.available2017-03-03T11:00:53Z
dc.date.issued2015
dc.description.abstractThere is considerable international concern and scientific debate about the current state and future of tuna stocks worldwide and the capacity of Regional Fisheries Management Organisations to manage the associated fisheries effectively. In some cases, this concern has extended to predictions of imminent collapse with minimal chances of recovery, even under a commercial catch moratorium. As a viable alternative to a full fishery closure, the Commission for the Conservation of Southern Bluefin Tuna (CCSBT) has adopted a scientifically tested, adaptive rebuilding strategy for the depleted southern bluefin tuna (Thunnus maccoyii) stock. The management procedure (MP) adopted involves a harvest control rule that fully specifies the total allowable catch as a function of key indicators of stock status, adjusting future harvest levels every three years so as to meet the rebuilding targets agreed by CCSBT. It was chosen from a subset of candidate MPs selected following extensive simulation testing. This involved first selecting a wide range of plausible scenarios for stock status and input data, ranging from pessimistic to optimistic, against which the alternative candidate MPs were tested to ensure that they were robust to important uncertainties. This is the first time that a comprehensively evaluated MP has been adopted for an internationally managed tuna stock. Both the process and the outcomes have broad applicability to other internationallymanaged stocks.en_ZA
dc.identifier.apacitationHillary, R. M., Preece, A. L., Davies, C. R., Kurota, H., Sakai, O., Itoh, T., ... Branch, T. A. (2015). A scientific alternative to moratoria for rebuilding depleted international tuna stocks. <i>Fish and Fisheries</i>, http://hdl.handle.net/11427/24015en_ZA
dc.identifier.chicagocitationHillary, Richard M, Ann L Preece, Campbell R Davies, Hiroyuki Kurota, Osamu Sakai, Tomoyuki Itoh, Ana M Parma, Doug S Butterworth, James Ianelli, and Trevor A Branch "A scientific alternative to moratoria for rebuilding depleted international tuna stocks." <i>Fish and Fisheries</i> (2015) http://hdl.handle.net/11427/24015en_ZA
dc.identifier.citationHillary, R. M., Preece, A. L., Davies, C. R., Kurota, H., Sakai, O., Itoh, T., ... & Branch, T. A. (2015). A scientific alternative to moratoria for rebuilding depleted international tuna stocks. Fish and Fisheries.en_ZA
dc.identifier.issn1467-2960en_ZA
dc.identifier.ris TY - Journal Article AU - Hillary, Richard M AU - Preece, Ann L AU - Davies, Campbell R AU - Kurota, Hiroyuki AU - Sakai, Osamu AU - Itoh, Tomoyuki AU - Parma, Ana M AU - Butterworth, Doug S AU - Ianelli, James AU - Branch, Trevor A AB - There is considerable international concern and scientific debate about the current state and future of tuna stocks worldwide and the capacity of Regional Fisheries Management Organisations to manage the associated fisheries effectively. In some cases, this concern has extended to predictions of imminent collapse with minimal chances of recovery, even under a commercial catch moratorium. As a viable alternative to a full fishery closure, the Commission for the Conservation of Southern Bluefin Tuna (CCSBT) has adopted a scientifically tested, adaptive rebuilding strategy for the depleted southern bluefin tuna (Thunnus maccoyii) stock. The management procedure (MP) adopted involves a harvest control rule that fully specifies the total allowable catch as a function of key indicators of stock status, adjusting future harvest levels every three years so as to meet the rebuilding targets agreed by CCSBT. It was chosen from a subset of candidate MPs selected following extensive simulation testing. This involved first selecting a wide range of plausible scenarios for stock status and input data, ranging from pessimistic to optimistic, against which the alternative candidate MPs were tested to ensure that they were robust to important uncertainties. This is the first time that a comprehensively evaluated MP has been adopted for an internationally managed tuna stock. Both the process and the outcomes have broad applicability to other internationallymanaged stocks. DA - 2015 DB - OpenUCT DP - University of Cape Town J1 - Fish and Fisheries LK - https://open.uct.ac.za PB - University of Cape Town PY - 2015 SM - 1467-2960 T1 - A scientific alternative to moratoria for rebuilding depleted international tuna stocks TI - A scientific alternative to moratoria for rebuilding depleted international tuna stocks UR - http://hdl.handle.net/11427/24015 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/24015
dc.identifier.urihttp://onlinelibrary.wiley.com/doi/10.1111/faf.12121/full
dc.identifier.vancouvercitationHillary RM, Preece AL, Davies CR, Kurota H, Sakai O, Itoh T, et al. A scientific alternative to moratoria for rebuilding depleted international tuna stocks. Fish and Fisheries. 2015; http://hdl.handle.net/11427/24015.en_ZA
dc.languageengen_ZA
dc.publisherWileyen_ZA
dc.publisher.departmentMarine Resource Assessment and Management Groupen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.sourceFish and Fisheriesen_ZA
dc.source.urihttp://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1467-2979
dc.subject.otherInternational fisheries
dc.subject.othermanagement strategy evaluation
dc.subject.otherstock rebuilding
dc.subject.othertuna
dc.titleA scientific alternative to moratoria for rebuilding depleted international tuna stocksen_ZA
dc.typeJournal Articleen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
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