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

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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

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)

Taxonomy
1 species (Iswaeon davidi) isn't included.
Genus Range
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy