Achirus mazatlanus, the Mazatlan sole or Pacific lined sole, is a sole of the family Achiridae native to the eastern Pacific from northern Baja California and the Gulf of California to northernmost Peru. This demersal species can grow up to . It is found at depths of 1âÂÂ60 m in coastal lagoons and fresh water. Its diet consists of crustaceans, small fishes, polychaetes, and occasionally detritus.