Tachysurus is a genus of bagrid catfish, family Bagridae, from East and Southeast Asia, with the atlas recording species across China, Vietnam, India, Japan, Korea, Laos, and Russia. Like other bagrids, they have a naked, scaleless body, an adipose fin, and four pairs of barbels around the mouth for locating food by touch and taste in murky river and lake water; sizes across the genus range from under 2.5 in up to a substantial 14 in. The genus has absorbed a number of species previously placed in other bagrid genera as molecular studies reshuffled the group's classification, so its exact boundaries have shifted more than once in the recent literature.
Tachysurus is of far greater importance to food production than to the aquarium hobby: the yellow catfish, Tachysurus fulvidraco, is farmed at large commercial scale across China as a prized table fish, and its biology is comparatively well studied as a result, while most of its relatives in the genus remain little known outside regional ichthyology. None of the eleven species the atlas tracks carries a CARES designation, and the great majority — nine of eleven — are not evaluated for conservation status, reflecting how much of the diversity in this genus still awaits dedicated assessment despite one member's outsized economic importance.