The brown sole (Achirus klunzingeri) is a sole of the genus Achirus native to the eastern Pacific from central Mexico to northernmost Peru. This demersal species growth up to 23cm (09inches). It is found at depths of 10–40 m on sandy and muddy grounds and may enter fresh waters in estuaries and mangroves. Its diet consists of invertebrates, small fishes, pelagic eggs and larvae.