Check the regs, that get pretty specific on both where and which species, but about 10 years ago, on a fishing trip (hitting catch and release waters) bunch of guys wanted a fish fry and we were directed to a small lake in the park (Joffe) that had brook trout, which are not native there. I forget the limit (didn't matter - only managed enough for the dinner, what with the driving winter mix - in late August) but regs have surely changed and I know removing "invasives" to give the native cutthroat better chance at success is even more a policy there now. Good news, that small lake would have fished much easier with spinning gear, but all we'd brought was fly gear.