Results for an illustrative empirical decisison rule for hake projections for C3 scenarios in the context of alternative options for initial TAC reduction levels

 

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dc.contributor.author Rademeyer, Rebecca A
dc.contributor.author Plagányi, Éva E
dc.contributor.author Butterworth, Doug S
dc.date.accessioned 2016-03-14T09:47:50Z
dc.date.available 2016-03-14T09:47:50Z
dc.date.issued 2005
dc.identifier.citation Rademeyer, R.A, Plaganyi, E.E & Butterworth, D.S. (2005). Results for an illustrative empirical decisison rule for hake projections for C3 scenarios in the context of alternative options for initial TAC reduction levels. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/17759
dc.description.abstract This paper reports further investigations of the performance of an illustrative EMPIRICAL decision rule (OMP) for the hake resource for C3 scenarios only because these reflect (on average) a current spawning biomass ratio for M. capensis compared to M. paradoxus of about 2:1, which is considered more plausible than the much higher corresponding ratios for the C1 and C2 scenarios. Initial annual reductions of 5000, 8000 and 10000 tons are considered for the first two years. After that initial period, TAC changes are restricted to a maximum of 5%, both up and down. Results for the C6 scenarios (C6 corresponds to C3 in the same way as C4 to C1 – reflecting a greater proportion of M. capensis in past offshore trawl catches) show a reduction of about 15000t in the annual TAC for similar final depletion statistics (the lower 5%ile being of primary importance as risk is the concern here) for M. paradoxus. en_ZA
dc.language eng en_ZA
dc.subject Hake projections
dc.subject empirical decision
dc.subject C3 Scenarios
dc.subject TAC reduction
dc.title Results for an illustrative empirical decisison rule for hake projections for C3 scenarios in the context of alternative options for initial TAC reduction levels en_ZA
dc.type Working Paper en_ZA
dc.date.updated 2016-03-14T09:45:41Z
uct.type.publication Research en_ZA
uct.type.resource Research paper en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Marine Resource Assessment and Management Group en_ZA
dc.identifier.apacitation Rademeyer, R. A., Plagányi, É. E., & Butterworth, D. S. (2005). <i>Results for an illustrative empirical decisison rule for hake projections for C3 scenarios in the context of alternative options for initial TAC reduction levels</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/17759 en_ZA
dc.identifier.chicagocitation Rademeyer, Rebecca A, Éva E Plagányi, and Doug S Butterworth <i>Results for an illustrative empirical decisison rule for hake projections for C3 scenarios in the context of alternative options for initial TAC reduction levels.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2005. http://hdl.handle.net/11427/17759 en_ZA
dc.identifier.vancouvercitation Rademeyer RA, Plagányi ÉE, Butterworth DS. Results for an illustrative empirical decisison rule for hake projections for C3 scenarios in the context of alternative options for initial TAC reduction levels. 2005 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17759 en_ZA
dc.identifier.ris TY - Working Paper AU - Rademeyer, Rebecca A AU - Plagányi, Éva E AU - Butterworth, Doug S AB - This paper reports further investigations of the performance of an illustrative EMPIRICAL decision rule (OMP) for the hake resource for C3 scenarios only because these reflect (on average) a current spawning biomass ratio for M. capensis compared to M. paradoxus of about 2:1, which is considered more plausible than the much higher corresponding ratios for the C1 and C2 scenarios. Initial annual reductions of 5000, 8000 and 10000 tons are considered for the first two years. After that initial period, TAC changes are restricted to a maximum of 5%, both up and down. Results for the C6 scenarios (C6 corresponds to C3 in the same way as C4 to C1 – reflecting a greater proportion of M. capensis in past offshore trawl catches) show a reduction of about 15000t in the annual TAC for similar final depletion statistics (the lower 5%ile being of primary importance as risk is the concern here) for M. paradoxus. DA - 2005 DB - OpenUCT DP - University of Cape Town KW - Hake projections KW - empirical decision KW - C3 Scenarios KW - TAC reduction LK - https://open.uct.ac.za PB - University of Cape Town PY - 2005 T1 - Results for an illustrative empirical decisison rule for hake projections for C3 scenarios in the context of alternative options for initial TAC reduction levels TI - Results for an illustrative empirical decisison rule for hake projections for C3 scenarios in the context of alternative options for initial TAC reduction levels UR - http://hdl.handle.net/11427/17759 ER - en_ZA


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