Robustness test results associated with the new West Coast rock lobster OMP
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University of Cape Town
A wide variety of variants of the OMP have been evaluated. The aim of the variations was to try and produce narrower probability intervals for the resource recovery statistics (B(16/06) values). Variations that were attempted include: • Alternate values of 1 f and 2 f (relative weighting factors for trap, hoop and FIMS CPUE in the OMP) • Alternate values of p (see Eqn 1 in ASWS/JUL07/WCRL/MP/1 ) • Alternate levels of “capping” of input data (see pg section iv of ASWS/JUL07/WCRL/MP/1) • Alternate forms of the somatic growth “response” term (see pg 16 of ASWS/JUL07/WCRL/MP/1 • Limits on the extent of large inter-annual changes in the input indices, which would seem implausible • Maintaining future somatic growth rate constant (and removing the somatic growth term from OMP) in an attempt to improve the OMP performance based on future recruitment variability only.
Johnston, S.J., & Butterworth, D. S. (2007). Robustness test results associated with the new West Coast rock lobster OMP. ASWS/JUL07/WCRL/MP/3