By the way. The Wisconsin person mentioned "killer shrimp." Had me somewhat puzzled so I looked it up. There is such a creature (Dikerogammarus villosus) and it does have the potential of becoming an invasive species in the Great Lakes. According to what I was able to find, no killer shrimps here, so far.
My guess he's talking about bloody mysis (Hemimysis anomala) one of the last noted Great Lakes invasives. Though it's been in the lakes since 2006, it's not become widespread.
This is the first I've heard of them occurring in numbers approaching any that would affect coho migrations or smelt numbers.
Not saying the cheese-head was lying about what he's catching, just dubious about the reasons.
With less and less warm water discharges, Bailey closing soon also, it will take more and more sun filled days, warm rains, and warm nights to change the water temps. Not saying that it is not going to happen, it changed about 3deg last week, but if there is nothing for the fish to eat they will not stay long, they are predators and need food. The western basin of the lake seems to be holding the bait so not hard to drawn the conclusion that is were the fish will be. Another issue for the southshore is there isn't much structure to this end of the lake so holding bait and other fish is much more difficult. So in our goby filled waters the fish that have adapted to feeding on them will be more abundant. Just an observation no real data or more insight than fishing lake MI north and south for 40yrs. It's not over but just not the good old days anymore and who knows if it ever will be again.
The South End provides useful resources and discussion forums for those that fish The South End of Lake Michigan for Salmon, Steelhead, Perch, and Bass as well as elsewhere in the Region and Chicago area.