Or this one:
Deschutes River Native Broodstock Evaluation:

In 1977, Reg Reisenbichler published a paper comparing the growth and survival differences between hatchery and wild steelhead. In this study Reisenbichler compared crosses between wild and hatchery fish to hatchery and wild fish in both the stream and hatchery environments. He found that “there were genetic differences in growth rate and survival between the offspring of hatchery and wild steelhead.” The hatchery steelhead were derived from the wild fish in the river and at the time of this work, they were two generations removed from the wild gene pool.

He found that “The observed differences in survival suggested that the short-term effect of hatchery adults spawning in the wild is the production of fewer smolts and ultimately, fewer returning adults than are produced from the same number of only wild spawners.”

Even though the hatchery fish were only two generations removed from the wild population, the hatchery fish survived better in the hatchery ponds and their run timing had changed compared to the wild fish. In contrast the wild fish survival was higher than hatchery fish in the natural streams.

Source: J. Fish. Res. Board Can., Vol 34, 1977