Morphological Variability of Far Eastern Redfins of the Genus Pseudaspius (Leuciscidae)

The interspecific variability of the fluctuating asymmetry, mean values, and coefficients of variation of seven characters in Far Eastern redfins (Pacific redfin Pseudaspius brandtii (Dybowski, 1872), Sakhalin redfin P. sachalinensis (Nikolskii, 1889), big-scaled redfin P. hakonensis (Gunther, 1877), and P. aff. hakonensis have been studied for the first time. The number of differences between them can significantly vary in different indicators. The lowest number of differences in all indicators is observed between big-scaled redfin and P. aff. hakonensis, significantly more differences are recorded between Pacific and Sakhalin redfins, and the largest number of differences between the latter and big-scaled redfin and P. aff. hakonensis. The P. aff. hakonensis differs from the Pacific redfin in smaller cases than big-scaled redfin, which may be determined by its origin through the hybridization of big-scaled redfin with Pacific redfin. The lowest sum of variances of fluctuating asymmetry and coefficients of variation is characteristic of Pacific redfin, which is obviously associated with more stable conditions of embryonic and early post-embryonic development in the former case and may indicate its relative morphological stability in the area in the latter case.