It would take more than a couple of stray fish to establish a self-sustaining run of steelhead. The Skamania stock summer-runs, which represent the bulk of hatchery summer-run stocks in the state, are not highly successful at spawning. Per the local WDFW biologist, after many years of planting Skamania stocks above the mouth of Deer Creek on the N. Fk. Stilly the run is still not self-sustaining and, with the elimination of plants, would dwindle and disappear. Some successful spawning obviously does take place. I have caught unmarked steelhead who were apparently the descendants of hatchery fish that had successfully spawned, but there just don't seem to be enough of them. Remember, there were only a relative few streams in the state that had native strains of summer-run steelhead and they were probably highly adapted to the peculiar characteristics of those particular streams.
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PS