Results of the progression towards a proposed Management Procedure for the Toothfish (Dissostichus eleginoides) Resource in the Prince Edward Islands vicinity



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Brandão and Butterworth (2019a) investigated various target-based Candidate Management Procedures (CMPs) for the Prince Edward Islands toothfish resource; however, their performances under some operating models were not satisfactory so that further investigation/adjustment of these CMPs was needed. An adjusted form of CMP(mean+tag) of Brandão and Butterworth (2019a), which incorporated trends in the cumulative number of recaptured tags as well as the recent mean of the trotline CPUE, was considered to have good potential as a CMP. This paper documents the various iterations of results as this CMP was refined and the results examined by a Task Team. The “final” MP now proposed for the consideration of the Demersal Working Group considers an initial smoothing of the TAC trajectory, is tuned to a target of 40% of the median final depletion under OM10 and constrains the TAC to a maximum inter-annual change of 10%. This MP performs satisfactorily under most of the OMs, in that median catches increase for most of the projection period while catch rates keep increasing and the median final depletion remains above the specified target value under OM10. The application of an initial TAC smoothing largely eliminates the pattern of an initial increase before a later drop in TACs.