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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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 Genus Micrasema (Little Grannoms)

I have only seen two species of this small genus mentioned in angling books, and neither was said to be anything special.

Where & when

In 308 records from GBIF, adults of this genus have mostly been collected during June (31%), July (24%), May (20%), August (12%), and April (6%).

In 222 records from GBIF, this genus has been collected at elevations ranging from -30 to 8566 ft, with an average (median) of 1742 ft.

Genus Range

source

Map of specific collection sites

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