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Morphological variations and discriminant analysis of Scomber japonicus and Scomber australasicus in the Yellow Sea and East China Sea

SHAO Feng,CHEN Xin-jun,LI Gang,QIAN Wei-guo(College of Marine Science and Technology,Shanghai Fisheries University,Shanghai 200090,China)  
Based on 19 morphological proportional characters of Scomber japonicus and S.australasicus,four multivariation analysis methods were used to comparably investigate the morphological variations among the three populations——two populations of S.japonicus in the west of Goto islands and in the west of East China Sea,and one population of S.australasicus.The result of difference coefficient test showed that S.japonicas in the different areas have not yet reached the discriminant level of different subspecies.The result of the test of different coefficients on the average revealed that 8 morphological proportional characters(FL/BL,SPL1/BL,ED/BL,D2-4/BL,D2-5/BL,D3-5/BL,D4-7/BL,D6-7/BL) were significant difference between the two populations of S.japonicus(P0.05),and 14 morphological proportional characters(FL/BL,SPL1/BL,D1-3/BL,D2-3/BL,D2-4/BL,D2-5/BL,D3-4/BL,D3-5/BL,D45/BL,D4-6/BL,D4-7/BL,D5-6/BL,D5-7/BL,D6-7/BL) were significantly different between S.japonicus and S.australasicus(P0.05).In the prin-cipal component analysis,four principal components were constructed,and the cumulative contributory ratio was 67.09%.The discriminant functions of the three populations were established,and the discriminant accuracy ranged from 70.0% to 85.0% for P1,ranged from 72.4% to 82.3% for P2,and averaged at 78.6% for the total.All the results indicated that the attribution of three populations can be determinited by differences in proportional characters.
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