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(genus Rasbora), any of a group of about 45 species of schooling, freshwater tropical fishes in the carp family, Cyprinidae. Most species are found in Southeast Asia, but a few are native to Africa. The fishes are active, generally slender, and have a protruding lower jaw. Several species are kept as pets, one of the most popular being the harlequin fish, or rasbora (R. heteromorpha), a reddish fish 4-5 cm (1.5-2 inches) long with a wedge-shaped, black spot on each side.