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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Mayfly Genus Nixe

The only species currently in this genus reported to produce fishable hatches is Nixe lucidipennis.

Angling books sometimes mention hatches of Nixe criddlei and Nixe simpliciodes. These species have been moved to the genus Ecdyonurus.

Where & when

In 68 records from GBIF, adults of this genus have mostly been collected during July (53%), June (21%), August (16%), and May (6%).

In 7 records from GBIF, this genus has been collected at elevations ranging from 3 to 2722 ft, with an average (median) of 1781 ft.

Genus Range

Hatching behavior

These species hatch in or near the surface in calm water. Emergence is quite fast, but the duns may drift a while.

Spinner behavior

Time of day: Dusk

Habitat: Riffles

The female spinners oviposit by flying over the water and dropping down to the surface to release some eggs, then taking off to do it again. They eventually fall spent.

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Mayfly Genus Nixe

Genus Range
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