A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity

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dc.contributor.authorBrandão, Anabela
dc.contributor.authorButterworth, Doug S
dc.date.accessioned2016-03-14T09:33:24Z
dc.date.available2016-03-14T09:33:24Z
dc.date.issued2009
dc.date.updated2016-03-14T09:28:19Z
dc.description.abstractThe status of the toothfish resource in the Prince Edward Islands region is unclear because CPUE data suggest considerable depletion, whereas catch-at-length information indicates that past catches have had relatively little impact on abundance. A Management Procedure (MP) approach is proposed to provide a sound scientific basis to recommend future TACs in the face of this appreciable uncertainty. Four Operating Models (OMs) reflecting ‘Optimistic’, ‘Intermediate’, ‘Less Pessimistic’ and a ‘Pessimistic’ current status for the resource are developed which take account of the different selectivities of past longline and pot fisheries. These OMs are used for trials of a candidate generic MP which could provide future TAC recommendations for this resource. The MP uses two data sources: the recent trend in longline CPUE and the mean length of the catches made. An MP with control parameter values specified is proposed for implementation based on the results of the trials. Given the importance of an adequate catch rate for the economic viability of the fishery, the choice of control parameter values focused primarily on a reasonable probability of securing a catch rate increase, whatever the current resource status. MP performance is reasonably robust across a range of sensitivity tests, although it does deteriorate in conservation terms if the stock-recruitment curve steepness h is low. These tests also indicate that monitoring of future catch-at-length information would be necessary to guard against a change in selectivity towards greater catches of older fish.en_ZA
dc.identifier.apacitationBrandão, A., & Butterworth, D. S. (2009). A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity. <i>CCAMLR Science</i>, http://hdl.handle.net/11427/17758en_ZA
dc.identifier.chicagocitationBrandão, Anabela, and Doug S Butterworth "A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity." <i>CCAMLR Science</i> (2009) http://hdl.handle.net/11427/17758en_ZA
dc.identifier.citationBrandão, A., & Butterworth, D. S. (2009). A proposed management procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity. CCAMLR Science, 16, 33-69.en_ZA
dc.identifier.ris TY - Journal Article AU - Brandão, Anabela AU - Butterworth, Doug S AB - The status of the toothfish resource in the Prince Edward Islands region is unclear because CPUE data suggest considerable depletion, whereas catch-at-length information indicates that past catches have had relatively little impact on abundance. A Management Procedure (MP) approach is proposed to provide a sound scientific basis to recommend future TACs in the face of this appreciable uncertainty. Four Operating Models (OMs) reflecting ‘Optimistic’, ‘Intermediate’, ‘Less Pessimistic’ and a ‘Pessimistic’ current status for the resource are developed which take account of the different selectivities of past longline and pot fisheries. These OMs are used for trials of a candidate generic MP which could provide future TAC recommendations for this resource. The MP uses two data sources: the recent trend in longline CPUE and the mean length of the catches made. An MP with control parameter values specified is proposed for implementation based on the results of the trials. Given the importance of an adequate catch rate for the economic viability of the fishery, the choice of control parameter values focused primarily on a reasonable probability of securing a catch rate increase, whatever the current resource status. MP performance is reasonably robust across a range of sensitivity tests, although it does deteriorate in conservation terms if the stock-recruitment curve steepness h is low. These tests also indicate that monitoring of future catch-at-length information would be necessary to guard against a change in selectivity towards greater catches of older fish. DA - 2009 DB - OpenUCT DP - University of Cape Town J1 - CCAMLR Science LK - https://open.uct.ac.za PB - University of Cape Town PY - 2009 T1 - A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity TI - A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity UR - http://hdl.handle.net/11427/17758 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17758
dc.identifier.vancouvercitationBrandão A, Butterworth DS. A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity. CCAMLR Science. 2009; http://hdl.handle.net/11427/17758.en_ZA
dc.languageengen_ZA
dc.publisherMARAM, University of Cape Townen_ZA
dc.publisher.departmentMarine Resource Assessment and Management Groupen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.sourceCCAMLR Scienceen_ZA
dc.source.urihttps://www.ccamlr.org/en/publications/ccamlr-science
dc.subject.otherPatagonian toothfish
dc.subject.otherDissostichus eleginoides
dc.subject.otherManagement procedure
dc.subject.otherPrince Edward Islands
dc.titleA proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinityen_ZA
dc.typeJournal Articleen_ZA
uct.subject.keywordsPatagonian toothfishen_ZA
uct.subject.keywordsDissostichus eleginoidesen_ZA
uct.subject.keywordsManagement procedureen_ZA
uct.subject.keywordsMPen_ZA
uct.subject.keywordsPrince Edward Islandsen_ZA
uct.subject.keywordsCCAMLRen_ZA
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
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