Browsing by Subject "South African Merluccius paradoxus"

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    Further results relating to appropriate TACs for the South African Merluccius paradoxus and M. capensis resources
    (2006) Rademeyer, Rebecca A; Butterworth, Doug S
    A simple species-aggregated population model is applied to combined-species hake CPUE data since 1992 as a “reality check” on the short term substantial reductions in TACs being indicated by candidate OMPs when tested under the operating model. These simple computations suggest similar levels of TAC reduction are necessary to restore resource abundance (and hence CPUE) to 1992 levels over the next 10 years. Retrospective analyses comparing the reliabilities of the SR1 and SR2 options in predicting recent recruitment are pursued, and suggest slight preference for use of the SR2 option. TAC projections under the various OMP candidates for fixed future inputs for resource abundance indices are shown to illustrate how the TACs output by these OMPs depend on the index values input
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    Updated reference set for the South African Merluccius paradoxus and M. capensis resources and projections under a series of candidate OMPs
    (2006) Rademeyer, Rebecca A; Butterworth, Doug S
    This paper reports estimates of management quantities for the updated Reference Set for thehake resource, now fitted to two further years of hake abundance indices, as specified at the last meeting of the Demersal Working Group. Estimates for two major variants of the assumptions for this Set are also reported. The empirical OMP introduced earlier is retuned for various M. paradoxus recovery levels under differing inter-annual TAC constraints. Performance statistics for the resultant OMP candidates are reported for both the updated Reference Set and the two major robustness tests. Effort projections indicate a reduction of at least one third in the average annual effort applied over the past some five years likely to be needed to secure resource recovery. Suggestions are made for the next steps in the process of finalising a OMP selection.