Abstract
Geometric morphometrics is a quick and reliable approach to differentiate fish stocks based on the variation of otolith shapes. In this study, morphometric analysis of otolith shapes was used to differentiate three species of Scomber. The sagittae morphology of S. scombrus otolith is totally different from that of S. japonicus and S. australasicus. Multivariate analysis consistently showed that S. japonicus was morphologically similar to S. australasicus, whereas a significant difference in otolith shapes was detected between S. scombrus and other two species of Scomber. The rostrum, antirostrum, excisural notch and dorsal-posterior margin of the otolith reflect the main variations between the three species of Scomber. Shape indices and Fourier coefficients were used to discriminate fish species using analysis of variance and Fisher discriminant analysis. The shape indices successfully differentiated 100%, 95.7% and 96.4% of otoliths in S. japonicus, S. australasicus and S. scombrus, respectively, while the Fourier coefficients only discriminated 70.0%, 61.9% and 91.3% of the sagittae in S. japonicus, S. australasicus and S. scombrus. This study indicates that the shape analysis on the sagittae morphometrics of otoliths is a better method to differentiate species of Scomber.
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Acknowledgements
This research was funded by the National Natural Science Foundation of China (No. 41776171), International Science and Technology Cooperation Program of China (No. 2015DFR30450), Public Science and Technology Research Funds Projects of Ocean (No. 201505025), Chongqing Research Program of Basic Research and Frontier Technology (No. cstc2016jcyjA0327), Genetic Resources Conservation Grant (Fisheries) from the Ministry of Agriculture of the P. R. China (No. 171721301354052181) and Ecological Fishery Industrial Technology System Project from Chongqing Municipal Agriculture Commission (Grant to YL). Tao He is grateful for the support of the China Scholarship Council (201508505111) with the visiting scholar programs to Flinders University. All procedures performed complied with the ethical standards and guidelines of Zhejiang Ocean University of China.
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He, T., Cheng, J., Qin, Jg. et al. Comparative analysis of otolith morphology in three species of Scomber . Ichthyol Res 65, 192–201 (2018). https://doi.org/10.1007/s10228-017-0605-4
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DOI: https://doi.org/10.1007/s10228-017-0605-4