I have been cleaning off my dock and have only seen dead minnows and one dead 6" perch. I am right on the old riverbed so I usually can see what is floating past. Not to say that it hasn't happened, but I have not seen any other dead fish.
There were dead fish on main street but not sure if they were from the Montello or Fox river.
Stay out of the water as it is still a nasty mix of decaying vegetation and run off from the farm fields and septic tanks
On a positive note, the fish are jumping like crazy. Hoping to finish pier and fish this Friday.