Adults reach an impressive length, often exceeding 60 cm. Characteristic features include a flattened head and a rather large mouth. The eyes of these catfish are small, and their role in orientation is minimal, which is explained by the low light in murky bottom waters. The main tool for finding food is long, highly sensitive barbels – a key organ of touch. The tail is relatively compact, but its outermost rays have developed into filamentous appendages, which can sometimes be longer than the entire body of the fish. The coloration is usually pale: yellow or gray, and young catfish may show pinkish hues. The body is adorned with a pattern of wide dark stripes, which can be vertical, oblique, or even branched, sometimes breaking into separate spots.