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    A method for estimating recruitment and mortality from time series of length-density data

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    Numéro du document:
    WG-FSA-00/52
    Auteur(s):
    A. Constable and I. Ball (Australia)
    Point(s) de l'ordre du jour
    Résumé

    Estimates of natural mortality are currently unavailable for Patagonian toothfish. Such estimates are needed for estimating recruitments and for use in assessing yield. This paper proposes a method for jointly estimating natural mortality and cohort strength at age 4 using a negative log-likelihood function based on one or more cohorts for which their abundance has been estimated in two or more years. A worked example is provided in an appendix.