My 2 cents on our bass
I wouldn't worry too much about the bass. They fit the same niche as our existing coarse fish species (mostly pimeminnows), and if anything, will just displace a few of them. They don't proliferate in our cold waters, and sure they probably eat a few of our game fish, but guess what? Our game fish eat them too. I don't fish for them, or particularly like them, but tossing the ones you catch into the bush isn't going to make an ounce of difference. But if it makes you feel like a hero, go for it. They're in the Fraser drainage, so they're here to stay.