[quote=backlash2][quote=JoJo]Would be interesting to see what would happen if a river with decent habitat and a wild fish population still somewhat making escapement was no longer planted with hatchery fish as a test case. More than likely it would take years to get any results. But I think we would have a better understanding of what affects they have.
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Unfortunately, the net and troll fisheries in the bay just outside the mouth of whatever river you tried it in would skew the real results...


Some point to the John Day as an example of this. I don't have the figures around, but apparently the numbers of steelhead in the John Day exceeds 15k fish?