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.

Stream photos

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Tricorythodes (Trico) Mayfly Nymph Tricorythodes (Trico) Mayfly Nymph

Dorsal view of a Tricorythodes (Leptohyphidae) (Trico) Mayfly Nymph from Mystery Creek #308 in Washington

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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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Caddisfly Species Hydropsyche slossonae (Spotted Sedges)

Where & when

Time of year : June

This widely distributed species is most common in the Midwest, where it is one of the most important species of Hydropsychidae.

In 72 records from GBIF, adults of this species have mostly been collected during July (32%), June (25%), May (21%), and August (17%).

In 27 records from GBIF, this species has been collected at elevations ranging from 10 to 4675 ft, with an average (median) of 1921 ft.

Species Range

source

Map of specific collection sites

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