The South Holston has a dense and diverse population of aquatic insects and invertebrates. I have conducted numerous kick surveys and gastric lavages and have observed at least one stage of the following in or on the South Holston: Midges, black flies, spiders, early stoneflies, yellow stoneflies, golden stoneflies, numerous varieties of caddis flies, scuds, sowbugs, snails, crayfish, baetis (BWO, blue winged olives), sulphur mayflies, craneflies, aquatic worms, leeches, riffle beetles, and hellgrammites. The South Holston trout also dine on trout eggs, sucker eggs, sculpins, other trout, terrestrials (grasshoppers beetles, cicadas, ants, etc.) and more. The South Holston is most famous for its dependable sulphur hatches. I warn you though, don't expect it to be easy!