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    Tag linking – revised algorithm (2019)

    Request Meeting Document
    Document Number:
    WG-SAM-2019/07
    Author(s):
    CCAMLR Secretariat
    Submitted By:
    Dr Stephane Thanassekos (CCAMLR Secretariat)
    Approved By:
    Dr David Agnew (CCAMLR Secretariat)
    Agenda Item(s)
    Abstract

    The CCAMLR Tagging Programme is a key part of CCAMLR’s management of toothfish fisheries and linking the details of recaptured fish to that of tagged fish is a key element of the programme. The CCAMLR Secretariat has developed a new tag linking approach that is designed to provide greater flexibility in linking recaptures to releases, including where a recapture is linked with equal probability to multiple releases. This new approach uses more of the available data to increase the level of transparency and provides an index of the level of confidence in all linked mark-recapture data.

    The Secretariat requests advice from the Members on processes for deprecating the existing tag-linking approach and transitioning to the new routine as the default tag linking method used by the Secretariat. In particular, the Secretariat seeks guidance from Members that use toothfish tagging data on any additional descriptions and diagnostics that could be provided to facilitate the adoption of this change in tag-linking approach.

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