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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington
This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
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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Mayfly Species Epeorus frisoni

This is a very uncommon species. The identification of all the specimens I've placed in this section is actually very uncertain, as they have proven incredibly difficult to identify. A professional entomologist collected more specimens from this stream, raised some nymphs, and did some genetic tests, and it's still uncertain. This reflects the ambiguity in the definitions and descriptions of many mayfly species.

Where & when

Preferred waters: Cold

Altitude: High

In 1 records from GBIF, adults of this species have been collected during August (100%).

Species Range

Specimens of the Mayfly Species Epeorus frisoni

2 Male Duns
1 Female Dun
1 Female Spinner

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Mayfly Species Epeorus frisoni

Species Range
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