Updated assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2018

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dc.contributor.authorBrandão, Anabela
dc.contributor.authorButterworth, Doug S
dc.date.accessioned2020-01-20T06:55:44Z
dc.date.available2020-01-20T06:55:44Z
dc.date.issued2019
dc.description.abstractThe assessment of the Prince Edward Islands (PEI) toothfish (Dissostichus eleginoides) resource carried out by Brandão and Butterworth (2018) is updated to take further data now available for 2018 into account. This update also incorporates tag-recapture data and a new basis to estimate the extent of cetacean depredation. For the new Base case and most of the assessment sensitivities, the resource is estimated to be at a depletion (in relation to its average pre-exploitation level in terms of spawning biomass) in the 36-40% range. If the model is forced to fit the trotline CPUE indices, the estimated average pre-exploitation level in terms of spawning biomass is 19%, but this requires an assumption of very high levels of tag loss and the last two tag-recapture data points are not fitted well.en_US
dc.identifier.apacitationBrandão, A., & Butterworth, D. (2019). <i>Updated assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2018</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics. Retrieved from http://hdl.handle.net/11427/30761en_ZA
dc.identifier.chicagocitationBrandão, Anabela, and Doug Butterworth <i>Updated assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2018.</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2019. http://hdl.handle.net/11427/30761en_ZA
dc.identifier.citationBrandão, A., Butterworth, D. 2019. Updated assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2018.en_ZA
dc.identifier.ris TY - Report AU - Brandão, Anabela AU - Butterworth, Doug AB - The assessment of the Prince Edward Islands (PEI) toothfish (Dissostichus eleginoides) resource carried out by Brandão and Butterworth (2018) is updated to take further data now available for 2018 into account. This update also incorporates tag-recapture data and a new basis to estimate the extent of cetacean depredation. For the new Base case and most of the assessment sensitivities, the resource is estimated to be at a depletion (in relation to its average pre-exploitation level in terms of spawning biomass) in the 36-40% range. If the model is forced to fit the trotline CPUE indices, the estimated average pre-exploitation level in terms of spawning biomass is 19%, but this requires an assumption of very high levels of tag loss and the last two tag-recapture data points are not fitted well. DA - 2019 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PY - 2019 T1 - Updated assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2018 TI - Updated assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2018 UR - http://hdl.handle.net/11427/30761 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/30761
dc.identifier.vancouvercitationBrandão A, Butterworth D. Updated assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2018. 2019 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/30761en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematicsen_US
dc.publisher.facultyFaculty of Scienceen_US
dc.titleUpdated assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2018en_US
dc.typeReporten_US
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