Oreoleuciscus angusticephalus

Oreoleuciscus angusticephalus, the narrow-headed Altai osman, is a species of cyprinid in the genus Oreoleuciscus. It is endemic to Mongolia and has a maximum length of 23.8 cm. Its young feed on plankton while adults feed predominantly on fish. It has a lifespan of over 40 years and takes 8–9 years to mature.