I strongly believe that to truly protect native species in many their remaining watersheds what's needed is a MUST KILL regulation. You catch a invasive or a hybrid you have to by law kill it. I can hear the howls now, " What about the people who can't tell a walleye from an bull trout?" Well, in reality that's just an enforcement issue, more COs on the ground and in all honesty a few dead natives will cause a helluva lot less impact than hordes of brookies, cuttbows, mongrelized rainbows and brown trout will. Whats the answer? I don't know... special license where you have to pass an ID test if you want to fish streams containing native sport fish???
I spent Wednesday fishing a stream that used to have cutthroat and brook trout 10-15 yrs ago. I fished 5 km up the valley and never saw a single frickin' cutt and it pisses me off immensely.