Sol -
I haven't followed all the deleted discussions however have a couple comments/concerns in addition to those by Salmo g. to add to you wild brood stock hatchery example.

The first is that in your example we run a very high risk of a handful of families of fish dominate the population. In your example of 100,000 smolts and 10% survival it is likely that as many as 3,000 hatchery fish would end up spawning in the wild. Now most of our individual steelhead stocks (Sol Duc, Hoh, Sauk, etc) are no larger than that so 1/2 of more of the natural spawners would be hatchery fish. I guess that would be OK if the original brood stock were representive of the wild population of course the likely hood of that being the case is very low. As a result such a program will run the risk of alternating the genetic makeup of the wild population.

Secondly the smolts from such a hatchery program would be exposed to a different environment and selective pressures than their wild brothers for their freshwater rearing stage. Most work to date has shown that different selection pressure often results in their offspring being less successful in the wild (individual spawners less successful). Becasue of the size of your program those "hatchery" produced fish would be spawning with many of the natural produced fish resulting in not only lowering the productivity of the natural spawning hatchery/hatchery cross but the hatchery/wild crosses as well. If the two groups of fish were more or less equal in size only 1/4 of the natural matings would involved parents who were both wild.

While many may be comfortable with those potential risks I'm not. I have completely ignored the management questions of what happens to the wild produced fish when the tribal gills net attempt to catch their 1/2 of the hatchery fish that are returning at approximately the same time as the wild fish. But I reasonable sure that they would be fishing for those hatchery fish.

Tight lines
Curt