They are Native,
They can Swallow stuff thats Bigger then them. and if its in there mouth they Digest it making them a Bigger smolt predator.
but Bass, Walleye, Sturgeon, are also Predators.
Im pretty sure tui chubs arn't native they were introduced illegaly to any water they are in in oregon same with stickleback(at least in the cental lakes)
But don't lots of other things? You cannot eat a pikeminnow I take it. Are they native?