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    Validating the Gasco-method for depredation estimation in Subarea 48.3

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    Número de documento:
    WG-SAM-16/32
    Autor(es):
    M. Söffker and T. Earl
    Presentado por:
    Dr Marta Söffker (Unión Europea)
    Aprobado por:
    Dr Chris Darby (Reino Unido)
    Punto(s) de la agenda
    Resumen

    Depredation is experienced by several fisheries within the CCAMLR Area, however not all fisheries have a data collection programme that is sufficiently long established, or detailed, to allow for model estimation of the lost catch. A new method was developed in 2014 that used an observed change in ratios of toothfish to grenadiers on depredated longlines, and proved to estimate losses similarly to a depredation model. Here this method was adapted for Subarea 48.3 and compared to the outputs from an alternative long-standing model estimation approach feeding into the CASAL assessment for toothfish. The new method performed similarly to the established method both in estimating total losses, and identifying spatial patterns.