There's all the science that anyone could ever want to read showing the short comings of hatchery fish, the problems they cause, and where and why they have caused declines in wild fish.

I will post the Kathryn Kostow report that I got permission from Kathryn to use showing useing DNA on Clackamas steelhead where the adults of hatchery and wild winters and hatchery summers were identified along with naturally produced out migrating smolts through DNA testing.
You will see where no serious cross breeding has taken place throughout the years as again identified through DNA and where hatchery summer steelhead were surprisingly more sucessfull at spawning in the wild than had previously thought but didn't survive the "round trip".
Yes as science has shown us many times before, naturally produced hatchery fish are on a one way trip for the most part.

And probably most important of all in the study you will see how the hatchery summer steelhead caused a decline in the wild and native winter steelhead on the Clackamas River.

Perhaps the best, most interesting hatchery report I have ever read.

Should answer some questions and open some eyes.

Dano