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    An integrated stock assessment for the Crozet Islands Patagonian toothfish (Dissostichus eleginoides) fishery in Subarea 58.6

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    Numéro du document:
    F. Massiot-Granier and C. Péron
    Soumis par:
    Félix Massiot-Granier (France)
    Approuvé par:
    Marc Eléaume (France)

    This paper presents an updated stock assessment for the Patagonian toothfish (Dissostichus eleginoides) fishery of the Crozet Islands, CCAMLR sub-area 58.6, with data up to the end of the season 2019/2020 (End of August 2020). This updated assessment model is based on the best available data and includes longline tag-release and tag-recapture data from 2007 to 2020 and priors and estimates on life traits model parameters (e.g. growth, maturity and natural mortality). It also uses commercial data that account for fish removals (fishing mortality and depredation) and support the estimation of their associated selectivity functions.

    Compared to the previous assessment presented at WG-FSA 19 (Massiot-Granier et al., 2019, WG-FSA-2019/57 Rev. 1), this assessment accounts for (1) updated data (2019/2020) and (2) updated depredation rates. All model runs were conducted with the CASAL 2.30 2012-
    03-21 rev. 4648, that was agreed on by WG-SAM-14.

    The updated model leads to equivalent estimate of the virgin spawning stock biomass SSB0 than the one obtained in 2019, with an estimate of 55 740 tons (49 220 - 60 500 tons). The estimate of the current SSB status of the stock is 65,2% (61.4 % - 68.5 %) and the current catch limit satisfies the CCAMLR decision rules.