Morphological variations in , and their reciprocal hybrids were measured and analyzed. The results showed that the ratios of left eye type in the obverse hybrid (K. bicoloratus♀×♂) were 66.9% and 57.3%, respectively, which was between that of (0). The scales on the reciprocal hybrids were distributed similarly to those on and on the equivalent body positions where bony plates occurred on . The reciprocal hybrids had dorsal, anal, and caudal finstripes similar to those of , but they were smaller and more lightly colored. The lateral lines of the obverse hybrid and bent at the end of the pectoral fin, whereas the lateral lines of the inverse hybrid and were approximately linear. The average hybrid meristic character index values of the two hybrids were 20.73 and 20.76, indicating that their meristic characters tended to be more similar to those of their female parents, as shown by the chi-square analysis. Among 11 metric character ratios, most of the metric characters were not different ( > 0.05) between the hybrids and their female parents, and the average hybrid index values of the two hybrids were 27.16 and 26.47, indicating that their metric characters tended to be more similar to those of their female parents, as shown by the cluster analysis. Four discriminant functions were established in the discriminatory analysis. Average discriminant accuracy was 97.50%, indicating that the discriminant effect was ideal. Four principal components were constructed by factor loadings in the principal component analysis, and the cumulative contributing proportion was 82.562%. Scatter plots showed that the morphological differences between the two hybrids were independent of . Therefore, a multivariate analysis of meristic and metric characters could be useful to identify and distinguish the morphological variations among , and their reciprocal hybrids. These results indicate that the reciprocal hybrids between in eye position and scale and fin morphological characteristics and resembled their female parents in the lateral line and meristic and metric characters. The results will help discriminate the morphological characters and determine the genetic relationships between , and their reciprocal hybrids and allow for breeding excellent hybrids.