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

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Numéro du document:
WG-FSA-2019/59
Auteur(s):
L. Wei, G.P. Zhu, T. Okuda, S. Parker, I. Slypko and S. Somhlaba
Soumis par:
Guoping Zhu
Approuvé par:
Xianyong Zhao (Chine)
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Résumé

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.