If we had to choose one fly pattern with which to fish any and all stonefly hatches, it would be the Stimulator. Available in a number of sizes and colors, this generalist pattern is super buoyant, has a great stonefly profile when viewed by a rising trout, and is extra deadly when fished with a wet fly dropped off the hook.
Hint: in order to choose the best size Stimulator to tie on during a stonefly hatch, if you can't capture a insect to match the size, look at the nymph skins left on the rocks and logs around the river and get close in size.
Dry/Wet: Dry
Fly Category: Generalist Pattern
Family: Stoneflies
Species: Chloroperlidae Stonefly, Early Brown Stonefly, Yellow Sally Stonefly, Golden Stonefly, Skwala Stonefly, Salmonfly
Life Stage: Adult
