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    Tag-overlap statistic calculation method

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    Document Number:
    WG-SAM-2023/18
    Author(s):
    CCAMLR Secretariat
    Submitted By:
    Mr Daphnis De Pooter (CCAMLR Secretariat)
    Approved By:
    Dr David Agnew (CCAMLR Secretariat)
    Agenda Item(s)
    WG-SAM-2023 - 5.2 - Data collection needs
    Abstract

    The formula to calculate the tag overlap statistic is specified in footnote 3 of CM 41-01 Annex C. This formula is used to compare the length frequency distribution of tagged fish to that of caught fish. However, observers do not measure the lengths of all caught and retained fish which complicates the calculation of this similarity indicator. Here we describe the rationale and preferred method to estimate the length frequency distribution of caught fish.