Ictalurus is a genus of North and Central American catfish in the family Ictaluridae, the group that also includes the smaller bullhead and madtom catfishes but reaches its largest members here. Its native range spans the United States and Canada south through Mexico into Belize and Guatemala, and the atlas's 12 species range enormously in size, from around 9 in up to 65 in, spanning small Mexican endemics up to the blue catfish, one of the largest freshwater fish in North America.
Channel catfish and blue catfish are major food and sport fish across the United States, farmed at large scale and a mainstay of recreational rod fishing, but the genus is essentially unsuited to home aquaria given the eventual size of these species; smaller individuals are occasionally kept in large outdoor ponds before being rehomed. Several of the genus's smaller species, including the Pánuco, Balsas, Lerma, Rio Verde, Grijalva, and Chapala catfish, are narrow-range endemics of specific Mexican river and lake systems rather than food or aquarium fish. The IUCN tally leans Not Evaluated (7), reflecting limited assessment of some of these Mexican endemics, but also includes a Vulnerable and an Endangered species tied to shrinking, heavily used Mexican lake and river systems.