What is the Little Yellow Sally Hatch? Entomology of Little Yellow Stoneflies (Genus Isoperla)

by in Fly Hatches


Little Yellow Stonefly or Yellow Sally - Insect Genus Isoperla

This group of stoneflies includes over 60 species, which are quite common to many well oxygenated, fast flowing, gravelly bottomed rivers across the U.S., hatching sporadically from May through much of the summer.

Nymph:  Nymphs often grow up under rocks in swift riffle and run portions of the river, dining on smaller bugs that inhabit those rocks.  Before the yellow sally nymph hatches, they crawl toward shore where the water is calmer.  During this trip, they often get dislodged, drift down river, and become a tasty meal for trout.  Try a dead drifted little sally nymph through riffles and runs on these rivers.  As the hatch progresses, target the edges of the river with the same dead drifted nymph.

Isoperla or Yellow Sally Nymph, Photo by Bob Henricks
Isoperla or Yellow Sally Nymph, Photo by Bob Henricks
Isoperla or Yellow Sally Nymph, Photo by Bob Henricks
Isoperla or Yellow Sally Nymph, Photo by Bob Henricks
Little Yellow Sloan Stonefly
Little Yellow Sloan Stonefly
Yellow Sally Nymph
Yellow Sally Nymph
Panty Dropper Nymph - Yellow Sally
Panty Dropper Nymph - Yellow Sally

See All Stonefly Nymphs

Adult Yellow Sally Stonefly:  Nymphs crawl onto dry land late in the afternoon, evening and night, where they break out of their exoskeleton to become a flying adult.  After mating, the adult female returns to the water to lay eggs, then she dies.  Watch for these bugs flying around overhanging bushes, cast a dry Sally in the same area, and the fun begins!  These rises are often acrobatic and splashy!  Once the Sally dies, you can imitate this with a dead drifted dry sally.

Isoperla or Yellow Sally or Little Yellow Stonefly. Image by Jason Neuswanger at TroutNut.com
Isoperla or Yellow Sally or Little Yellow Stonefly. Image by Jason Neuswanger at TroutNut.com
Isoperla or Yellow Sally or Little Yellow Stonefly. Image by Jason Neuswanger at TroutNut.com
Isoperla or Yellow Sally or Little Yellow Stonefly. Image by Jason Neuswanger at TroutNut.com
Isoperla or Yellow Sally or Little Yellow Stonefly. Image by Jason Neuswanger at TroutNut.com
Isoperla or Yellow Sally or Little Yellow Stonefly. Image by Jason Neuswanger at TroutNut.com
Para Sally Adult Stonefly
Para Sally Adult Stonefly
Mini Hot Yellow Sally
Mini Hot Yellow Sally
Stacked Sally Adult Stonefly
Stacked Sally Adult Stonefly

See All Adult Yellow Sallies

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