Results of the progression towards 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
dc.date.accessioned2021-03-16T07:03:32Z
dc.date.available2021-03-16T07:03:32Z
dc.date.issued2020
dc.description.abstractBrandão and Butterworth (2019a) investigated various target-based Candidate Management Procedures (CMPs) for the Prince Edward Islands toothfish resource; however, their performances under some operating models were not satisfactory so that further investigation/adjustment of these CMPs was needed. An adjusted form of CMP(mean+tag) of Brandão and Butterworth (2019a), which incorporated trends in the cumulative number of recaptured tags as well as the recent mean of the trotline CPUE, was considered to have good potential as a CMP. This paper documents the various iterations of results as this CMP was refined and the results examined by a Task Team. The “final” MP now proposed for the consideration of the Demersal Working Group considers an initial smoothing of the TAC trajectory, is tuned to a target of 40% of the median final depletion under OM10 and constrains the TAC to a maximum inter-annual change of 10%. This MP performs satisfactorily under most of the OMs, in that median catches increase for most of the projection period while catch rates keep increasing and the median final depletion remains above the specified target value under OM10. The application of an initial TAC smoothing largely eliminates the pattern of an initial increase before a later drop in TACs.en_US
dc.identifier.apacitationBrandão, A., & Butterworth, D. (2020). <i>Results of the progression towards a proposed Management Procedure for the Toothfish (Dissostichus eleginoides) Resource in the Prince Edward Islands vicinity</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics. Retrieved from http://hdl.handle.net/11427/33136en_ZA
dc.identifier.chicagocitationBrandão, Anabela, and Doug Butterworth <i>Results of the progression towards a proposed Management Procedure for the Toothfish (Dissostichus eleginoides) Resource in the Prince Edward Islands vicinity.</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2020. http://hdl.handle.net/11427/33136en_ZA
dc.identifier.citationBrandão, A. & Butterworth, D. 2020. <i>Results of the progression towards a proposed Management Procedure for the Toothfish (Dissostichus eleginoides) Resource in the Prince Edward Islands vicinity</i>. ,Faculty of Science ,Department of Mathematics and Applied Mathematics. http://hdl.handle.net/11427/33136 .en_ZA
dc.identifier.ris TY - Report AU - Brandão, Anabela AU - Butterworth, Doug AB - Brandão and Butterworth (2019a) investigated various target-based Candidate Management Procedures (CMPs) for the Prince Edward Islands toothfish resource; however, their performances under some operating models were not satisfactory so that further investigation/adjustment of these CMPs was needed. An adjusted form of CMP(mean+tag) of Brandão and Butterworth (2019a), which incorporated trends in the cumulative number of recaptured tags as well as the recent mean of the trotline CPUE, was considered to have good potential as a CMP. This paper documents the various iterations of results as this CMP was refined and the results examined by a Task Team. The “final” MP now proposed for the consideration of the Demersal Working Group considers an initial smoothing of the TAC trajectory, is tuned to a target of 40% of the median final depletion under OM10 and constrains the TAC to a maximum inter-annual change of 10%. This MP performs satisfactorily under most of the OMs, in that median catches increase for most of the projection period while catch rates keep increasing and the median final depletion remains above the specified target value under OM10. The application of an initial TAC smoothing largely eliminates the pattern of an initial increase before a later drop in TACs. DA - 2020 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PY - 2020 T1 - Results of the progression towards a proposed Management Procedure for the Toothfish (Dissostichus eleginoides) Resource in the Prince Edward Islands vicinity TI - Results of the progression towards a proposed Management Procedure for the Toothfish (Dissostichus eleginoides) Resource in the Prince Edward Islands vicinity UR - http://hdl.handle.net/11427/33136 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/33136
dc.identifier.vancouvercitationBrandão A, Butterworth D. Results of the progression towards a proposed Management Procedure for the Toothfish (Dissostichus eleginoides) Resource in the Prince Edward Islands vicinity. 2020 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/33136en_ZA
dc.publisher.departmentDepartment of Mathematics and Applied Mathematicsen_US
dc.publisher.facultyFaculty of Scienceen_US
dc.titleResults of the progression towards a proposed Management Procedure for the Toothfish (Dissostichus eleginoides) Resource in the Prince Edward Islands vicinityen_US
dc.typeReporten_US
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