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    Revised research plan for toothfish in Division 58.4.4 b by Shinsei maru No. 3 in 2014/15

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    Document Number:
    WG-FSA-14/21
    Author(s):
    Delegation of Japan
    Submitted By:
    Ms Doro Forck (CCAMLR Secretariat)
    Agenda Item(s)
    Abstract

    In this document, we revise stock status assessments of D. eleginoides in research blocks C and D using CPUE analogy method, Petersen method and CASAL model, although the data of current season has not been validated and not used for the present analysis. We used updated reference area size for the CPUE method and altered natural mortality for the Petersen and CASAL methods. Detailed results using CASAL models in research block C are described in a separated document.

    The estimated stock size in block C was 709, 401 and 850 tonnes in CPUE analogy method, Petersen method and CASAL Len_1 model (vulnerable biomass in 2013), respectively.

    The stock sizes of D. eleginoides in block D is estimated at 948 tonnes only by using CPUE method, as the catch and tagging data in block D was not enough to be applied to Petersen method and CASAL models.

    We propose to continue the current research operation for the next fishing season with the same survey design and sample size of 60 tonnes in order to further strengthen the stock assessments in the area.