I have to agree with Carcassman here. The idea of selective breeding came before we even had the hatcheries to do it. My own limited experience at hatcheries they took the biggest bucks in the pool and used those to spawn all the hens.
There is a cost involved with selective breeding as well, both in dollars and in numbers of fish. My Dad invented a self feeding system at a fish farm. Problem was 20% of the fish ate 80% of the food while most of the rest of the fish starved. Our hatchery releases would go way down if we only released 20% of the fish. Would these fish come back larger and have larger offspring? Perhaps. Or maybe they would return as jacks.

Enhancing the rapid growth of yearling releases and/or delaying their release til they reach a larger size DEFINITELY encourages "jacking up" among the males. Maturity and size at release are directly proportional to the rate of precocious puberty.

"Jacking what?????". They have found that some really rapidly growing Chinook males spawn before smolting. They are the only Pacific salmon, to my knowledge , that actually survive the first spawning and spawn again a year later.

It seems that we should have learned (just how many times are you gonna hit that thumb with that hammer?) that all the technological fixes don't, haven't worked for actual salmon recovery. They do allow us to not deal with the real problem. Like yelling "emails, Benghazi" it diverts us from dealing with the real problems because they are very difficult and the solutions are painful.