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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.

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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 Iswaeon (Tiny Blue-Winged Olives)

This genus currently contains three species, only one of which is important to anglers. See Iswaeon anoka for details.

Where & when

In 10 records from GBIF, adults of this genus have been collected during July (40%), May (30%), June (20%), and September (10%).

In 4 records from GBIF, this genus has been collected at elevations of 3, 26, 886, and 1089 ft.

Genus Range

Start a Discussion of Iswaeon

Mayfly Genus Iswaeon (Tiny Blue-Winged Olives)

1 species (Iswaeon davidi) isn't included.
Genus Range
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