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Yellow sally stoneflies are large, robust insects that live underwater as nymphs before emerging as adults. A yellow sally stonefly hatch is when a large number of these insects emerge from the water, creating a feeding frenzy for fish.
Yellow sally stoneflies are a significant food source for trout and other fish, making a yellow sally stonefly hatch a prime time for fly fishing. Anglers use various fly patterns to imitate different stages of the yellow sally stonefly life cycle, including nymphs, emergers, and adults.