Rhodeus is a genus of cyprinid fish, consisting of 21 species called bitterlings. The scientific name is derived from the Greek word rhodeos, meaning "rose".
Bitterlings are short-lived species, generally surviving only about 5 years. Their maximum size is 11 cm, but they are usually much shorter. Bitterlings inhabit slow-flowing or still waters, such as ponds, lakes, marshes, muddy and sandy pools, and river backwaters. Because they depend on freshwater mussels to reproduce, their range is restricted. Bitterlings are omnivorous, feeding on both invertebrates and plants.he scientific name is derived from the Greek word rhodeos, meaning "rose".