This is certainly a hot button issue with quite the discussion for both sides. In Maine we've begun to see a distinction with "Native" vs "Wild" brook trout and that distinction is being used in the management and fishing regulations in those waters with in the state. I for one am a fan of the native fish species, and would prefer to have the native fish over the exotics. But I won't turn my nose to them either, the way I see it the current species of fish are in the water systems and you may as well fish for them. I say maintain the status quo and do everything possible to prevent new introductions of fish species despite it being a losing battle. Agencies should be tailoring regulations to protect species if they are in danger of losing a species, but everything has to be a trade off.