Sulfur Spinner Fly

This is a major hatch in Eastern Rivers and Streams

 

Sulfur Spinner Fly
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Sulfur Spinner: Here again we have the infamous Genus Ephemerella with species rotunda and invaria the Eastern sulpher duns. Hatching is between Mid-May and late June. E. rotunda is first triggered by 52-58 degree water with E. invaria hatching a few weeks later with 54-60 degree water temperature. Spinners gather above stretches of riffle water at dusk. Male spinners almost never fall spent whereas females may.

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