Perhaps but if the hatchery serves as a dead-end where no fish can get upstream of the hatchery, and there is no spawning habitat downstream, there are no impacts to wild fish regardless of the number of surplus adults. Many of the U.S. Fish and Wildlife Service hatcheries in the Columbia Basin are like this (Little White Salmon, Spring Creek, etc). And some of the WDFW hatcheries have a barrier dam upstream, and virtually no habitat downstream. Again, the impact to wild fish from excess spawners is minor .