Fungus on Bluegill

I have a 4 yo pond and everything has gone great! Stocked with LMB, BG and CC. I hand feed once a day with Optimal Bluegill pellets. The pond is approximately 3/4 acre, aerated . I have a good percentage of LMB and BG above the 100 percentile in RW.
I found this 2.15 lb BG today swimming head downward and slow. It appears to have some sort of fungus. Anyone able to help me out with a diagnosis? So far only 1 found but I have had 5 or 6 floaters and passed them off as deeply hooked from the grandkids fishing. Definitely want to nip this in the bud! Is it contagious? Thanks to all!