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    Analysis of the toothfish fishery indices in Subareas 88.1 and 88.2 when using different types of longline gears

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    Document Number:
    S. Kasatkina
    Submitted By:
    Dr Svetlana Kasatkina (Russian Federation)
    Approved By:
    Dr Svetlana Kasatkina (Russian Federation)

    The indices of exploratory toothfish fishery in the Subareas 881 and 88.2   for the period of 2010-2016 are considered. Taking into account the different number of hooks at longlines sets used at the fishery, the catch indices were normalized to 1000 hooks.  The effect of the gear types (autoline, spanish, trotline) on the observed spatial-temporal variability of CPUE toothfish   (kg/1000 hooks), by-catch CPUE (kg/1000 hooks) and normalized target catch ratio is considered. Particular attention was focused to the analysis of the length-species compositions of catch by years and SSRU while using different types of longlines. Our results  show that the gear type  is the most important factor that must be taken into account both during the longline fishery data analysis and the research programs planning.