Pending a check with J.R., we observed 24 fish species, with one unverified, but likely correct:
longnose gar, largescale stoneroller, whitetail shiner, warpaint shiner, river chub, Tennessee shiner, sawfin shiner, bluntnose minnow, northern hogsucker, golden redhorse (or black, but what I saw appeared to be the former; silver, river, and shorthead also possible, but I don't think we saw any), rock bass, redbreast sunfish, bluegill, longear sunfish, smallmouth bass, greenside darter, rainbow darter, bluebreast darter, fantail darter (1? may only be one prior record in upper Fall or Piney), redline darter, snubnose darter, tangerine darter, logperch, and freshwater drum.
This is a Tangerine Darter male taken at the Conservation Fisheries facility. You can swim with them at Whites Creek. We did.
More time and effort in riffle habitats and deep waters, and more rock turning would likely yield 35+...
Randy got this shot of the first Diana Fritillary female of the year:
She looks totally different with her wings closed. Still beautiful.