In 1997 coho salmon (Oncorhynchus kisutch) in the Klamath River basin, as part of the Southern Oregon Northern California Coasts evolutionary significant unit (SONCC Coho ESU), were listed as threatened under the Endangered Species Act (ESA). The National Marine Fisheries Service (NMFS) cited water management, water quality, loss of habitat, overfishing, and other factors as causing a serious decline of the species within this ESU.