Turnover is the culprit. The lake has had very little inflow all year due to the drought. thus causing a very defined thermocline. Then with heavy rainfall resulting in a 4-5 foot rise of cooler water, the annual turnover came a little early. Also, they are really pulling the lake to get it down to winter pool (makes very little sense to me considering pending water shortages across the sout east) and this pulls cool river and creek water into the existing warm lake water which exacerbates the turnover.
Turnover decreases average oxygen ppm throughout the entire water column thereby stressing all life depending on that oxygen. This stress in turn causes all kinds of problems for the fish including the skin fungus we are seeing on the hybrids and LM at Barren.