Brook, Rainbow, Cutthroat, Steehead trout and Artic Char - all good eating when fresh, but they don't keep well even when frozen. I'll freeze bookies sometimes if I've had a good weekend haul, but find its best to thaw and cook within a few months.
Lake trout, meh, not a big fan.
Don't know about brown, bull, golden trout - haven't had the chance to try them.
