For identification of morphometric characteristics in rainbow trout, Oncorhynchus mykiss, coho salmon, O. kisutch, and their allotriploid, twenty one body traits were measured, and the ratios of each trait to fork length, length from postorbital to the origin of caudal fin and head length were calculated. The ratios of fin length to fin height in anal, dorsal and adipose fins showed significant differences among these two species and their allotriploid $(pleq0.01)$. Allotriploid could be distinguished easily from two parents species in the ratios of length of origin of ventral fin to fork length and anal fin length to anal fin height.