Results for Initial Candidate Management Procedure Testing for Greenland Halibut

dc.contributor.authorRademeyer, R A
dc.contributor.authorButterworth, Doug S
dc.date.accessioned2017-11-07T09:05:14Z
dc.date.available2017-11-07T09:05:14Z
dc.date.issued2017-06
dc.description.abstractA number of target-based Candidate Management Procedures (CMPs) are applied to the full set of SCAA-based Operating Models (OMs) and robustness tests for Greenland halibut. These target-based rules are shown to outperform similar slope-based rules, especially in terms of lower inter-annual TAC changes, in achieving the same target of a resource at its MSY level in terms of median exploitable biomass in 20 years (2037). Four CMPs seem to reasonably capture the range from which a final MP might be selected. These have 2018 starting TACs of 15 000 or 20 000t, and are tuned to achieve the target exploitable biomass in 2037 at its MSY level for the baseline OM (OM0) or for Rob15 which assumes future under-reporting of catches at a level similar to the recent past. All four meet the agreed primary depletion probability criterion related to falling below 0.3BMSY. The higher initial TAC choice results in a smaller increase in spawning biomass. Performance is generally robust for the tuning based on the baseline OM0, except for greater depletion under Rob15. If this level of under-reporting is considered a reasonable possibility, a more conservative tuning level (i.e. a higher value of the tuning parameter α) than that for OM0 should be considered when choosing the final MP.en_ZA
dc.identifier.apacitationRademeyer, R. A., & Butterworth, D. S. (2017). <i>Results for Initial Candidate Management Procedure Testing for Greenland Halibut</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/26016en_ZA
dc.identifier.chicagocitationRademeyer, R A, and D S Butterworth <i>Results for Initial Candidate Management Procedure Testing for Greenland Halibut.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2017. http://hdl.handle.net/11427/26016en_ZA
dc.identifier.citationRademeyer, R.A. and Butterworth, D.S. 2017. Results for initial candidate management procedure testing for Greenland halibut. NAFO SCR Doc 17-026REV: 41pp.en_ZA
dc.identifier.ris TY - Working Paper AU - Rademeyer, R A AU - Butterworth, D S AB - A number of target-based Candidate Management Procedures (CMPs) are applied to the full set of SCAA-based Operating Models (OMs) and robustness tests for Greenland halibut. These target-based rules are shown to outperform similar slope-based rules, especially in terms of lower inter-annual TAC changes, in achieving the same target of a resource at its MSY level in terms of median exploitable biomass in 20 years (2037). Four CMPs seem to reasonably capture the range from which a final MP might be selected. These have 2018 starting TACs of 15 000 or 20 000t, and are tuned to achieve the target exploitable biomass in 2037 at its MSY level for the baseline OM (OM0) or for Rob15 which assumes future under-reporting of catches at a level similar to the recent past. All four meet the agreed primary depletion probability criterion related to falling below 0.3BMSY. The higher initial TAC choice results in a smaller increase in spawning biomass. Performance is generally robust for the tuning based on the baseline OM0, except for greater depletion under Rob15. If this level of under-reporting is considered a reasonable possibility, a more conservative tuning level (i.e. a higher value of the tuning parameter α) than that for OM0 should be considered when choosing the final MP. DA - 2017-06 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2017 T1 - Results for Initial Candidate Management Procedure Testing for Greenland Halibut TI - Results for Initial Candidate Management Procedure Testing for Greenland Halibut UR - http://hdl.handle.net/11427/26016 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/26016
dc.identifier.vancouvercitationRademeyer RA, Butterworth DS. Results for Initial Candidate Management Procedure Testing for Greenland Halibut. 2017 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/26016en_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.titleResults for Initial Candidate Management Procedure Testing for Greenland Halibuten_ZA
dc.typeWorking Paperen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceWorking paperen_ZA
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