Adults most often reach 8–9 cm in length, although larger specimens, up to 15 cm, are sometimes found. Such sizes are likely characteristic of individual geographical populations, given the wide range of the species. The catfish's body is slightly flattened, and its head, when viewed from above, has a triangular, pointed shape. Hard bony plates covering its body provide reliable protection for the fish. The fins are large and fan-shaped, with the first rays being thick and formed by spines. A distinctive feature is the pattern: dark lines along the entire body are clearly visible against a lighter background, which can be yellow, orange, or gray.