eburg, no I do not check on Explore comments. Have not been successful reading or signing up for that chat. Try Ginger52, who posts in this Forum and follows Explore and is really helpful about IDing critters.
As to the really large fish churning the shallow waters today, I'm guessing it is something spawning. Don't know if Walleye are here. Try looking at one of the state Depts of Natural Resources or Conservation to see which large fish are spawning now. In past years, the eagles catch huge lunkers at this time of year. Maybe buffalo something??