Fish Kill?

[TwainGang]

I fished Nodaway County Lake north of Maryville on Saturday and saw about 50 bluegill, a bass, a crappie and a channel cat floating dead on the water throughout the day. The fishing was still decent and it looks like a healthy lake, but I wonder if this was a natural type kill or perhaps a run-off caused kill. Just wondering and to give an alert in a conservation or fisheries person wanted to check it out. Some of the bluegill has a reddish rash on them- but I didn't know if that was the cause of death or a post-mortem artifact. Any ideas?

[MOfishmgr]

See my reply in the Ask the Biologist thread