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.

Waterfalls over smooth bedrock above Titcomb Lakes

From Titcomb Basin in Wyoming

Stream photos

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Female Hydropsyche (Spotted Sedge) Caddisfly Adult Female Hydropsyche (Spotted Sedge) Caddisfly Adult

Lateral view of a Female Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Adult from the Columbia River 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 Apatania incerta (Early Smoky Wing Sedges)

Where & when

Time of year : Mid-April to late May

Preferred waters: Small to medium streams

This species is reportedly very important in southern New England.

In 6 records from GBIF, adults of this species have been collected during April (67%) and May (33%).

In 12 records from GBIF, this species has been collected at elevations ranging from 1319 to 4209 ft, with an average (median) of 2280 ft.

Species Range

source

Map of specific collection sites

Hatching behavior

Time of day : All day

Egg-Laying behavior

Time of day: All day

Larva & pupa biology

Shelter type: Stone cases

Gary LaFontaine notes in Caddisflies that these larvae become especially active and vulnerable to trout shortly before pupation.

Start a Discussion of Apatania incerta

References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.
Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.