Prionotos Cory

About

Found along the coastal river drainages of southeastern Brazil, from Espírito Santo down to São Paulo, this armored catfish belongs to the family Callichthyidae. A group well known for the interlocking bony plates that replace conventional scales along the body. No distinct common name has stuck to this species, so hobbyists generally refer to it by its scientific name, Scleromystax prionotos, or occasionally by a CW number if the identification is uncertain, since the genus contains several species that are tricky to tell apart and others that remain formally undescribed. One genuinely fascinating trait is its ability to breathe atmospheric air. A portion of the intestine is heavily vascularized and functions almost like a lung, letting the fish absorb oxygen directly from the surface. In the aquarium you will notice individuals making quick trips to the top to gulp air, which is perfectly normal behavior. Worth knowing before you net one: the pectoral-fin spines are rigid, sharp, and capable of puncturing skin. The glands at the spine base may produce mild secretions that make the resulting wound more painful than you would expect, so a fine-mesh net and careful handling are sensible precautions. Temperament is peaceable, and the species is accessible enough for a beginner willing to respect those spines.