yep, the gills do have a parasite. i forget the technical name, but basically it is tranfered from herons to snails to fish...bck to herons..lol
parasite makes the flesh look like you had taken a pepper shaker to it and if your really lucky you can see a white larvae crawl out of it as well.
I would like to raise everyone's awareness too the 10 bluegill,10 crappie limit that applies to all waters at killdeer including reservoir.