Diplomystes nahuelbutaensis is a species of velvet catfish endemic to Chile where it occurs in the Bío-Bío River basin and in the Loncomilla River. It grows to a length of TL and is a component of local commercial fisheries as well as being a gamefish. References World Conservation Monitoring Centre 1996. Diplomystes nahuelbutensis. 2006 IUCN Red List of Threatened Species. Downloaded on 4 August 2007. nahuelbutaensis Catfish of South America Freshwater fish of Chile Endemic fauna of Chile Fish described in 1987