The Coho was listed threatened on October 31,1996. The current estimated population is less than 6,000. The species trend is unknown. In the 1940s, estimated abundance of naturally spawning adult Coho Salmons in the central California coast ranged from 50,000 to 125,000. Today, the estimation of naturally reproducing Coho Salmon is less than 6,000 and most of them are of non-native origin (from hatcheries).
The Coho Salmon is an anadromous salmonid species that was historically distributed throughout the North Pacific Ocean from central California to Point Hope, Alaska, through the Aleutian Islands and from the Anadyr River, Russia, south to Hokkaido, Japan. They only have a 3-year life cycle.