Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013

dc.contributor.authorBrandão, Anabela
dc.contributor.authorButterworth, Doug S
dc.date.accessioned2016-04-06T13:52:56Z
dc.date.available2016-04-06T13:52:56Z
dc.date.issued2013
dc.date.updated2016-04-06T13:51:53Z
dc.description.abstractThe ASPM assessment of the Prince Edward Islands toothfish resource by Brandão and Butterworth (2007) that permitted annual fluctuations about a deterministic stockrecruitment relationship is updated to take account of further catch, GLMM standardised CPUE and catch-at-length information that has become available for the years 2007 to 2013. The assessment allows for three fleets to accommodate data from a pot fishery that operated in 2004 and 2005 and a trotline fishery since 2008 in addition to the Spanish longline operations. Biological parameter values adopted for Subarea 48.3 are used. The resource is estimated to be at a depletion of about 87% of its average pre-exploitation level in terms of spawning biomass, but this requires large recruitment pulses in the 1990s and does not reflect the large CPUE decline when the fishery commenced. Imposing alternative constraints lead to a depletion of about 43%. These different assessments imply rather different sustainable yields, though all suggest medium term abundance increases for a TAC of 500 t.en_ZA
dc.identifier.apacitationBrandão, A., & Butterworth, D. S. (2013). <i>Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/18672en_ZA
dc.identifier.chicagocitationBrandão, Anabela, and Doug S Butterworth <i>Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2013. http://hdl.handle.net/11427/18672en_ZA
dc.identifier.citationBrandão, A., & Butterworth, D. S. (2013). Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013. MARAM: University of Cape Town.en_ZA
dc.identifier.ris TY - Working Paper AU - Brandão, Anabela AU - Butterworth, Doug S AB - The ASPM assessment of the Prince Edward Islands toothfish resource by Brandão and Butterworth (2007) that permitted annual fluctuations about a deterministic stockrecruitment relationship is updated to take account of further catch, GLMM standardised CPUE and catch-at-length information that has become available for the years 2007 to 2013. The assessment allows for three fleets to accommodate data from a pot fishery that operated in 2004 and 2005 and a trotline fishery since 2008 in addition to the Spanish longline operations. Biological parameter values adopted for Subarea 48.3 are used. The resource is estimated to be at a depletion of about 87% of its average pre-exploitation level in terms of spawning biomass, but this requires large recruitment pulses in the 1990s and does not reflect the large CPUE decline when the fishery commenced. Imposing alternative constraints lead to a depletion of about 43%. These different assessments imply rather different sustainable yields, though all suggest medium term abundance increases for a TAC of 500 t. DA - 2013 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2013 T1 - Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013 TI - Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013 UR - http://hdl.handle.net/11427/18672 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18672
dc.identifier.vancouvercitationBrandão A, Butterworth DS. Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013. 2013 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18672en_ZA
dc.languageengen_ZA
dc.publisher.departmentMarine Resource Assessment and Management Groupen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.titleAssessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013en_ZA
dc.typeWorking Paperen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceResearch paperen_ZA
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