I'm late to the party here and frankly I didn't read the whole thread.
I would however like to comment on a statement someone made about stocked trout having clipped fins.

I worked at a state trout hatchery for a short time. (more for the experience rather than the 9 bucks an hour. )
At this hatchery there were 30 indoor tanks that held 30,000 three inch trout each and when these fish reached 6-7 inches, they were netted, weighted, and trucked to outdoor tanks that held 13,000 fish each
Counting out (by weight) those 13,000 trout for each outdoor tank was done by 3 employees. 2 netting, one weighing.
Imagine if someone had to actually handle each and every one of those 900,000 fish to clip a fin !
The man hours involved would certainly not be cost effective, and the stress to the trout would not be at all healthy.
I'm not saying that other hatcheries don't clip a few fins..... but I can't picture it happening in too many.