It’s not like the magic number is 80 degrees. Even sustained water temps in the high 70’s will cause issues.
It’s the warm water coupled with depleted oxygen levels that occur during the “dog days” of summer that cause issues with reviving the larger fish such as muskies.
I came across 2 floaters on Tonka Sunday afternoon. One appeared to be fairly fresh upper fortys fish the other maybe a 45″.
I believe it’s best to leave them alone until we get a cool down and temps drop a few degrees. The fall bite this year may be fantastic, and there are 2 more fish that won’t be there for it. Dead fish don’t fight.