Further results for three simple initial Candidate Management Procedures 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.accessioned2020-01-23T12:06:31Z
dc.date.available2020-01-23T12:06:31Z
dc.date.issued2019
dc.description.abstractBrandão and Butterworth (2019a) proposed a simple Candidate Management Procedure (CMP) control rule based upon recent trends in CPUE by to provide future TAC recommendations for the Prince Edward Islands toothfish resource. Several suggestions made by a Task Team that evaluated the performance of this CMP are addressed in this paper. In particular, the CMP considered is tuned to target median final depletion levels of 30%, 40% and 50% under OM10 (which is the Operating Model (OM) with a better fit to the last two low trotline CPUE indices). These three CMPs are referred to as CMP30, CMP40 and CMP50 respectively. These CMPs are able to secure an increase in the TAC without adversely affecting the status of the resource under most OMs, especially for the more conservative CMP50. However, the performance under OM17, which addresses the concern with the poor fit to the trotline CPUE data in the last two years by assuming an increased tag loss rate, is not satisfactory. In order to tune these CMPs to react satisfactorily under the scenario assumed by OM17 would heavily penalise TACs under the scenarios reflected by the other OMs. A CMP which incorporates other information, to hopefully be able in some sense to better distinguish what the status of the resource is, might perform better under all OMs. Deterministic projections of mean length and the cumulative number of tags recaptured are examined for this purpose, and are suggestive that incorporation of these data could improve CMP performance.en_US
dc.identifier.apacitationBrandão, A., & Butterworth, D. (2019). <i>Further results for three simple initial Candidate Management Procedures 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/11427/30786en_ZA
dc.identifier.chicagocitationBrandão, Anabela, and Doug Butterworth <i>Further results for three simple initial Candidate Management Procedures for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity.</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2019. http://hdl.handle.net/11427/30786en_ZA
dc.identifier.citationBrandão, A., Butterworth, D. 2019. Further results for three simple initial Candidate Management Procedures for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity.en_ZA
dc.identifier.ris TY - Report AU - Brandão, Anabela AU - Butterworth, Doug AB - Brandão and Butterworth (2019a) proposed a simple Candidate Management Procedure (CMP) control rule based upon recent trends in CPUE by to provide future TAC recommendations for the Prince Edward Islands toothfish resource. Several suggestions made by a Task Team that evaluated the performance of this CMP are addressed in this paper. In particular, the CMP considered is tuned to target median final depletion levels of 30%, 40% and 50% under OM10 (which is the Operating Model (OM) with a better fit to the last two low trotline CPUE indices). These three CMPs are referred to as CMP30, CMP40 and CMP50 respectively. These CMPs are able to secure an increase in the TAC without adversely affecting the status of the resource under most OMs, especially for the more conservative CMP50. However, the performance under OM17, which addresses the concern with the poor fit to the trotline CPUE data in the last two years by assuming an increased tag loss rate, is not satisfactory. In order to tune these CMPs to react satisfactorily under the scenario assumed by OM17 would heavily penalise TACs under the scenarios reflected by the other OMs. A CMP which incorporates other information, to hopefully be able in some sense to better distinguish what the status of the resource is, might perform better under all OMs. Deterministic projections of mean length and the cumulative number of tags recaptured are examined for this purpose, and are suggestive that incorporation of these data could improve CMP performance. DA - 2019 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PY - 2019 T1 - Further results for three simple initial Candidate Management Procedures for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity TI - Further results for three simple initial Candidate Management Procedures for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity UR - http://hdl.handle.net/11427/30786 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/30786
dc.identifier.vancouvercitationBrandão A, Butterworth D. Further results for three simple initial Candidate Management Procedures for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity. 2019 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/30786en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematicsen_US
dc.publisher.facultyFaculty of Scienceen_US
dc.titleFurther results for three simple initial Candidate Management Procedures for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity.en_US
dc.typeReporten_US
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