I have a hunch that in our cooler waters, the salmonids eat more bass than the other way around. The bass probably compete for a niche with coarse fish a lot more than they do with salmon and trout. Of course I have no scientific evidence to back this up, but the Bass have been around for quite a while now, and I've never heard of them taking any serious toll on the salmonid population. Bass=food for our preffered species in these colder waters where they grow slower than the salmonids that inhabit the same water as them. People just love to hate bass
For example: Silvermere lake is full of bass, and they have a DIRECT path into the Stave river, then of course the Fraser, where they are not a prominent species, and seldom caught. The water is too cold for them to survive and flourish, so their population stays in check. On top of this, they occupy the same niche as the pikeminnow, so really the salmonid population will remain relatively steady, and the ratio of bass to pikeminnow MAY fluctuate some. Of course if we are talking lakes that were purely trout stock to begin with, then a waterbody can only sustain so many fish, and the bass will balance out the trout population, but probably not eradicate it. Most of these lakes were stocked to begin with, so although annoying, we are not losing many wild trout stocks either.
I do not in any way condone the transport or transplant of ANY invasive species, and I would not hesitate for a second to call in someone who was doing so, but some people need to untangle their underpants and go catch some fish
They're here now and likely not going anywhere, might as well get some enjoyment out of them, rather than have them ruin your day.