All your concern is well intentioned but...

It is a "Chicken Little" reaction to a non-event.

The DFW tried for years to establish Atlantic Salmon in the rivers of the NW and despite multiple plantings of eggs, fry, smolt and mature adults their best efforts failed.

These juvenile fish, at least the ones that escape the expense and effort aimed at removing them, will go to sea and those that survive and return to spawn will fail.

Too bad though! They are excellent fighting and tasty eating sport fish.