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Draft Two-Area Harvest Control Rules for OMP-13

Draft Two-Area Harvest Control Rules for OMP-13. SPSWG Meeting 31 st October 2013 Carryn de Moor Doug Butterworth. Marine Resource Assessment and Management Group (MARAM) Department of Mathematics and Applied Mathematics University of Cape Town. Two-Area HCRs.

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Draft Two-Area Harvest Control Rules for OMP-13

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  1. Draft Two-Area Harvest Control Rules for OMP-13 SPSWG Meeting 31st October 2013 Carryn de Moor Doug Butterworth Marine Resource Assessment and Management Group (MARAM) Department of Mathematics and Applied Mathematics University of Cape Town

  2. Two-Area HCRs Used to develop Interim OMP-13 v2 Now developed eg given in SWG-PEL Doc #27 Now developed

  3. Two-Area HCRs • Interim OMP-13 v2 – single area directed sardine TAC • Alternative MP – directed sardine TACs for west/south of Cape Agulhas • Draft – maintained same/similar constraints as Interim OMP-13 v2

  4. Some Assumptions • Sardine TAB with anchovy – initial ratio is based on observed sardine 1+ biomass. For comparability, the total sardine 1+ biomass is used • When simulation testing a 2-area HCR assuming a single sardine stock, future observations west/south of Cape Agulhas are drawn from proportions observed from 84-99 or 00-11

  5. Some Assumptions • If Sardine ECs are declared, the ‘top up’ after the recruit survey is dependent on observed recruitment up to Cape Infanta only

  6. HCR Control Parameters & Constraints No Change • Small (<14cm) sardine bycatch with directed 14cm sardine: Set as a proportion of directed sardine TAC and thus also split proportionally by area

  7. HCR Control Parameters & Constraints • No Change: • Anchovy HCR parameters (eg scale down factor, , weighting given to recruitment survey in anchovy TAC, p, etc.) • Anchovy historic averages used in TAC formulae • Anchovy constraints (max, min, max dec, 2-tier etc.) • Sardine TAB with anchovy control parameters

  8. HCR Control Parameters & Constraints

  9. HCR Control Parameters & Constraints

  10. Draft Two-Area Harvest Control Rules for OMP-13 Thank you for your attention

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