Oncorhynchus mykiss
In 1877, the second California rainbow trout hatchery and the first federal fish hatchery in the National Fish Hatchery System, was established on Campbell Creek, a McCloud River tributary. The McCloud River hatchery indiscriminately mixed coastal rainbow trout ("O. m. irideus") eggs with the eggs of local McCloud River redband trout . Eggs from the McCloud hatchery were also provided to the San Leandro hatchery, thus making the origin and genetic history of hatchery-bred rainbow trout somewhat diverse and complex. Rainbow trout eggs and fry from these two hatcheries were the original source of most artificially propagated rainbow trout in the world.