Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin

Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

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 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.