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    Stock assessment of Patagonian toothfish (Dissostichus eleginoides) in Subarea 48.4 – addressing the convergence issues encountered in the 2021 assessment

    Request Meeting Document
    Document Number:
    WG-SAM-2022/21
    Author(s):
    L. Readdy, T. Earl and C. Darby
    Submitted By:
    Ms Georgia Robson
    Approved By:
    Dr Chris Darby
    Agenda Item(s)
    WG-SAM-2022 - 3.2 - Stock assessment for established toothfish fisheries
    Abstract

    Alternative models are presented for discussion to address a lack of convergence in the CASAL model fit to Patagonian toothfish (Dissostichus eleginoides) in Subarea 48.4 owing to the increasing quantity of data. Of the models that converged successfully the outcomes showed very similar diagnostic results, particularly the MPD fits. The main differences between the approaches taken, either fixing or estimating Linf and k, was the impact on the reweighting of the effective sample size, tag dispersion parameter, YCS and the estimate of B0.