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    Estimates of local biomass, including estimates of uncertainty, for Antarctic (Dissostichus mawsoni) and Patagonian (Dissostichus eleginoides) toothfish in research blocks in Subareas 48.2, 48.6, 58.4 and 88.3

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    Document Number:
    CCAMLR Secretariat
    Submitted By:
    Dr Lucy Robinson (CCAMLR Secretariat)
    Approved By:
    Mr Andrew Wright (CCAMLR Secretariat)

    This paper includes updated local biomass estimates of toothfish populations with bootstrapped confidence intervals using both CPUE-by-seabed area and Chapman biomass estimation methods agreed at WG-SAM-16 with revisions to the CPUE-by-seabed area parameter values agreed at WG-SAM-17. The analysis includes Research Blocks in Subareas 48.2, 48.6, 58.4 and 88.3. Given the changes in CPUE-by-seabed area method parameter values that were agreed at WG-SAM-17, the estimates of biomass in the relevant Research Blocks have increased relative to the estimates that were presented at WG-FSA-16. The higher CPUE-by-seabed area estimates has also resulted in a greater overlap in confidence intervals with the Chapman estimates in some, but not all, of the Antarctic toothfish Research Blocks.