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    Statistical modelling of by-catch patterns: a preliminary case study using research fisheries in Subarea 48.6

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    Document Number:
    WG-SAM-2019/09
    Author(s):
    K. Sawada and T. Okuda
    Submitted By:
    Dr Kota Sawada (Japan)
    Approved By:
    Dr Taro Ichii (Japan)
    Abstract

    We report a preliminary result of statistical modeling of grenadier bycatch pattern by bottom longline research fisheries in CCAMLR Subarea 48.6, using generalized linear mixed models with zero-inflation. The result contains several issues including the failure of estimation in considerable number of candidate models, overdispersion and insufficient prediction of zero-catch, suggesting that further improvement is required.

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