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    Otolith morphological analysis cannot distinguish Antarctic toothfish (Dissostichus mawsoni) stocks in the Southern Ocean

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    Document Number:
    WG-FSA-2019/59
    Author(s):
    L. Wei, G.P. Zhu, T. Okuda, S. Parker, I. Slypko and S. Somhlaba
    Submitted By:
    Professor Guoping Zhu (China)
    Approved By:
    Dr Xianyong Zhao (China)
    Abstract

    Fourier shape analysis was used to study the morphology of sagittal otoliths of 383 Dissostichus mawsoni from 3 Subareas using two statistical methods. Stepwise discriminant analysis showed a classification accuracy of 73.19%. Principal component analysis revealed the accumulated contribution rate of 29 principal components was 72.45%. These findings demonstrate that Fourier analysis of otolith morphology cannot distinguish the stock populations of D. mawsoni between Subareas 48.1, 48.6 and 88.1.