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GEOMETRIC MORPHOMETRICS OF SAGITTAL OTOLITH OF FOUR NEMIPTERUS FISH SPECIES
Author(s): 
Pages: 496-503
Year: Issue:  3
Journal: Oceanologia et Limnologia Sinica

Keyword:  sagitta otolithgeometric morphometricslandmark methodthin plate spline analysisdiscriminant function analysisNemipterus;
Abstract: Identification of sagittal otoliths was investigated in geometric morphometrics among four sympatric species of genus Nemipterus: redspine threadfin bream N.nemurus(n=24),golden threadfin bream N.virgatus(n=32),yellowbelly threadfin bream N.bathybius(n=36),and Japanese threadfin bream N.japonicus(n=35).Specimens were collected in Beibu Gulf from September 2007 to September 2010.Landmark coordinate values were extracted after otolith digitized by processing image using relative warp(RW) as principal component,and grad distortion via thin plate spline.Eighteen RW values were used to differentiate the otoliths among four Nemipterus species.The result indicate that the 1st,2nd and 3rdRWs accounted for 30.78%,28.44%,and 11.75% of the total variation,respectively,among which TypeⅠlandmarks 6,10,and 11,TypeⅡ landmarks 2,and Type Ⅲ landmark 7 are important contributors,and could explain the most variation.Success in identifying the otolith could reach 91.3% by RW-based gradual discrimination,or 89.8% by cross validation,indicating that the geometric morphometrics is a potential tool in distinguishing Nemipterus species with otolith.
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