The California roach (Hesperoleucus symmetricus) is a cyprinid fish native to western North America and abundant in the intermittent streams throughout central California. It is the sole member of its genus.

This fish is of a relatively chunky body shape, with a largish head and large eyes, but a small mouth oriented downwards. Its color is a darker grayish-bluish above, and a dull silver underneath. During the breeding season, red-orange patches appear on the chin, operculum, and at the bases of pectoral, pelvic, and anal fins. The smallish dorsal fin has 7-10 rays, while the anal fin has 6-9 rays. They never get large, the maximum known being about 11 cm.