i'm not sure if i get what your saying about local fish, if you're talking about catching in local bow and stocking a tank? it might be difficult to get them to take to feed if that's what you're talking about.. check around for "pond stockers" or "fish farms" in your are where you can find (usually) feed trained fingerlings...

I don't see why you wouldn't be able to raise trout in a tank that size, base your fish load on your filtration (growbed volume)

follow the "rules of thumb" you'll find here for sizing and you should be fine... ask fo help along the way, plenty of info here