Systomus is a genus of barbs, torpedo-bodied minnows in the carp family Cyprinidae, distributed across South and Southeast Asia; the atlas's 14 species are recorded from India, Sri Lanka, Myanmar, Thailand, Laos, Afghanistan, Bangladesh, and Bhutan. The genus spans an unusually wide size range for a barb group, from about 2 in up to 16.5 in, the larger end represented by Systomus sarana, the olive barb, a widespread South Asian river and food fish. Systomus was split out of the old, catch-all genus Puntius in a wider revision of South Asian barbs, part of a broader reorganization that has reshuffled this group of cyprinids more than once in recent decades.
A handful of Systomus species reach hobbyists, including the small, colorful Systomus asoka (the Asoka barb) and Systomus pleurotaenia (the black-lined barb), kept as active, undemanding schooling fish in the same general style as other tropical barbs. Larger species such as Systomus sarana are of more regional food-fishery interest than aquarium interest. The genus's conservation picture is concerning for a substantial share of its species: alongside one Least Concern species, the atlas records two Critically Endangered, one Endangered, and one Vulnerable species, and two of the 14 carry CARES conservation-priority status, against a large Not Evaluated count that suggests the true picture across the genus is still being filled in.