The two species of fish: Shortnose sucker and Lost River sucker are native to southern Oregon and northern California. They are federally listed endangered species. Habitat degradation is considered primary cause for decline in populations for both species. Recovery plans were created and revised by the U.S. Fish and Wildlife Service. In 2002 the Service announce a petition to remove the Lost River sucker (Deltistes luxatus) and Shortnose sucker (Chasmistes brevirostris) from the Federal list of threatened and endangered species, pursuant to the Endangered Species Act of 1973.