Oh, I'm going to say it is very easy to tell them apart... with the frayed fins, dull silver color and complete lack of fight... if they are hold-overs (some of the lucky 2% of hatchery fish that are said to survive each year) then they do start to look more like the residents, which makes sense since color is supposed to come from the diet. In general though, it would be pretty easy to tell... maybe it's harder when they are dead and on a dinner plate though... I'd imagine some/most of the color drops out on the dinner plate.
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