I'm not planning on eating bass out of Keowee or Jocassee but why is there a mercury advisory on spotted bass and largemouth bass on both lakes but none for trout and smallmouth bass? Is the mercury naturally occurring or is it originating from somewhere else? Just curious as both lakes don't seem to have much industrial or agricultural things going on around it. I have fished the rivers that feed both these lakes and have never seen any of these signs so I am assuming it is not originating upstream.