Specification and conditioning of the hake OMP2018 Reference Set models

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dc.contributor.authorRoss-Gillespie, Andrea
dc.contributor.authorButterworth, Doug S
dc.date.accessioned2019-11-19T12:56:58Z
dc.date.available2019-11-19T12:56:58Z
dc.date.issued2018-11
dc.description.abstractThe specification and conditioning results of the nine 2018 Reference Set Operating Models are provided. These nine models consist of a cross of three different assumptions regarding the stock-recruitment relationship (one Ricker and two Beverton-Holt) and three assumptions regarding the central year in which the catch shifts from primarily M. capensis to primarily M. paradoxus. Estimates of current depletion for M. paradoxus range from 0.26 to 0.39 for the (generalised) Ricker, and from 0.15 to 0.41 for Beverton Holt stock-recruitment models. Current depletion for M. capensis ranges from 0.68 to 0.74 for Ricker, and from 0.08 to 0.76 for Beverton-Holt models. The Beverton-Holt based OMs generally reflect worse fits than the Ricker-based OMs in terms of the negative log-likelihood, and many of the Beverton-Holt models show little effect of changes in spawning biomass on expected recruitment. M. paradoxus is consistently estimated to be above BMSY . M. capensis is above BMSY except for the runs Beverton-Holt that produce a very flat biomass trajectory where biomass has little impact on recruitment.en_US
dc.identifier.apacitationRoss-Gillespie, A., & Butterworth, D. (2018). <i>Specification and conditioning of the hake OMP2018 Reference Set models</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics. Retrieved from http://hdl.handle.net/11427/30636en_ZA
dc.identifier.chicagocitationRoss-Gillespie, Andrea, and Doug Butterworth <i>Specification and conditioning of the hake OMP2018 Reference Set models.</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2018. http://hdl.handle.net/11427/30636en_ZA
dc.identifier.citationRoss-Gillespie, A., Butterworth, D. 2018-11. Specification and conditioning of the hake OMP2018 Reference Set models.en_ZA
dc.identifier.ris TY - Report AU - Ross-Gillespie, Andrea AU - Butterworth, Doug AB - The specification and conditioning results of the nine 2018 Reference Set Operating Models are provided. These nine models consist of a cross of three different assumptions regarding the stock-recruitment relationship (one Ricker and two Beverton-Holt) and three assumptions regarding the central year in which the catch shifts from primarily M. capensis to primarily M. paradoxus. Estimates of current depletion for M. paradoxus range from 0.26 to 0.39 for the (generalised) Ricker, and from 0.15 to 0.41 for Beverton Holt stock-recruitment models. Current depletion for M. capensis ranges from 0.68 to 0.74 for Ricker, and from 0.08 to 0.76 for Beverton-Holt models. The Beverton-Holt based OMs generally reflect worse fits than the Ricker-based OMs in terms of the negative log-likelihood, and many of the Beverton-Holt models show little effect of changes in spawning biomass on expected recruitment. M. paradoxus is consistently estimated to be above BMSY . M. capensis is above BMSY except for the runs Beverton-Holt that produce a very flat biomass trajectory where biomass has little impact on recruitment. DA - 2018-11 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PY - 2018 T1 - Specification and conditioning of the hake OMP2018 Reference Set models TI - Specification and conditioning of the hake OMP2018 Reference Set models UR - http://hdl.handle.net/11427/30636 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/30636
dc.identifier.vancouvercitationRoss-Gillespie A, Butterworth D. Specification and conditioning of the hake OMP2018 Reference Set models. 2018 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/30636en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematicsen_US
dc.publisher.facultyFaculty of Scienceen_US
dc.titleSpecification and conditioning of the hake OMP2018 Reference Set modelsen_US
dc.typeReporten_US
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