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.

Outlet stream of Upper Titcomb Lake

From Titcomb Basin in Wyoming

Stream photos

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Sweltsa (Sallfly) Stonefly Nymph Sweltsa (Sallfly) Stonefly Nymph

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.

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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 Rhyacophila grandis (Green Sedges)

This is an especially large species of Rhyacophila, with a maximum size of 30mm.

Where & when

Time of year : February to August

Preferred waters: Small streams

In 44 records from GBIF, adults of this species have mostly been collected during June (39%), July (30%), May (11%), August (9%), and September (7%).

In 8 records from GBIF, this species has been collected at elevations ranging from 69 to 1083 ft, with an average (median) of 354 ft.

Species Range

source

Map of specific collection sites

Rhyacophila grandis Fly Fishing Tips

Gary LaFontaine notes in Caddisflies that imitataions of these larvae work well during non-hatch periods because the widely spread emergence dates mean the mature larvae are available year-round.

Start a Discussion of Rhyacophila grandis

References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.