Darkly pigmented barbels, weak serrations along the posterier edge of the pectoral spine, and 15-19 anal rays. In BC, adults are black above and white or lemon yellow below. Juveniles are also black above and white below. This species can be confused with the brown bullhead (Ameirurus nevulosus) and the yellow bullhead (Ameiurus natalis), however adults can be separated by the development of serrations on the trailing edge of the pectoral spines, which are absent on brown and yellow bullhead. For further infoormation see McPhail (2007). (Source: McPhail, J. D. 2007. The Freshwater Fishes of British Columbia. The University of Alberta Press. 620 p.)
Source: McPail, J. D. 2008. The Freshwater Fishes of British Columbia. University of Alberta Press, Edmonton.