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Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Stonefly Species Isoperla fulva (Yellow Sally)

This is perhaps the most common Western species of Isoperla.

Where & when

Time of year : May‚ÄďAugust

Isoperla fulva has been found across the West in a wide variety of streams of different sizes, substrates, and at different elevations, from the high mountains of Colorado to the coastal hills of Washington.

Adults can emerge throughout the summer, but most have been collected from mid-June through early July.

Specimens of the Stonefly Species Isoperla fulva

3 Male Adults
2 Adults

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Species Range
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