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    Developing plausible estimates of subarea and fished area biomasses

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    Document Number:
    WG-ASAM-2021/14
    Author(s):
    B.A. Krafft, G. Macaulay, S. Fielding and P.N. Trathan
    Submitted By:
    Professor Philip Trathan (Oceanites)
    Approved By:
    Dr Chris Darby (United Kingdom)
    Abstract

    In this paper we present krill density biomass estimates for Subareas 48.1, 48.2, 48.3 and 48.4 and for current fished areas, using post-hoc stratification of krill density estimates from the 2019 International Krill Survey. We highlight the importance of survey strata design for the differing areas, with implications for management. Each level of stratification requires different extrapolations from survey area to stratum area.