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    Update of ongoing work on age and growth of Antarctic toothfish (Dissostichus mawsoni) from Division 58.4.1 by Spain

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    Document Number:
    WG-FSA-17/66
    Author(s):
    L.J. López-Abellán, M.T.G. Santamaría, R. Sarralde and S. Barreiro
    Submitted By:
    Mr Roberto Sarralde Vizuete (Spain)
    Approved By:
    Dr Eduardo Balguerías
    Agenda Item(s)
    WG-FSA-17 - 4.2.2.1 - Review of available information and data quality
    Abstract

    We present preliminary results on age and growth of Dissostichus mawsoni for the third season (2015/16) of the Spanish research fishing in the 58.4.1 Division obtained for growth rings on otolith readings. It is included the growth parameters estimates by sex. Growth parameters obtained using length-age pair values are: L∞: 208.2, k: 0.074 and t0: 0.564 for females; L∞: 173, k: 0.089 and t0: -0.1771 for males; and L∞: 226.4, k: 0.05673 and t0: -0.745 all combined. Values differ with the previous estimates, and comparisons are made between seasons, all seasons together as well as with the parameter values used in the Ross sea assessment.