The steelhead and the salmon are the least of it. They never should have been introduced into the Lakes in the first place.
If these things break loose and overrun the Lakes, the rest of the Great Lakes States should sue the city of Chicago and the State of Illinois to freeze every discretionary dollar in both of their respective coffers with the proceeds to go to re-engineering and re-implementing Chicago's waste water and sewage treatment systems to discharge to the Lake and not shunt it off over into the Illinois River/Mississippi drainage,as is currently the case. That's how this thing got to the point where it currently stands. This interbasin transfer should have never been allowed in the first place or at the least, once uniform CWA standards went into effect in the 70's, the city should have been forced to re-do the entire thing then.
They should sue them to pay for the changes and if there are any monies left, they should go to the rest of the GL states (especially MI and WI who will experience the most harm soonest) for damages.
I don't care if it bankrupts both the city and the state. Good riddance in fact..