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.

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Epeorus albertae (Pink Lady) Mayfly Nymph Epeorus albertae (Pink Lady) Mayfly Nymph

Dorsal view of a Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington

This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.

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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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Site updates from August 3, 2011

Closeup insects by Bnewell from the Touchet River in Washington

Male Claassenia sabulosa (Golden Stone) Stonefly Adult

2 Pictures

Male Claassenia sabulosa (Perlidae) (Golden Stone) Stonefly Adult from the Touchet River in Washington

The males have these abbreviated wings. I doubt they can fly but they can run faster than any stonefly I have seen. The also have an interesting habit of jumping.

Collected August 2, 2011 from the Touchet River in Washington

Added by Bnewell on August 3, 2011

Collected August 2, 2011 from the Touchet River in Washington and added by Bnewell on August 3, 2011

Female Claassenia sabulosa (Golden Stone) Stonefly Adult

3 Pictures

Female Claassenia sabulosa (Perlidae) (Golden Stone) Stonefly Adult from the Touchet River in Washington

I think this is one of the most poorly understood of the golden stoneflies. It is rare to see any articles about it or fishing the hatch. It emerges late in summer usually on medium to large rivers.The adults are quite secretive but it is something to see the adults run across the water surface. These guys can really run. The males have short wings.The females are up to 1 1/4 inch long rivaling the salmonfly as the largest adult stonefly in the west.The adults are not real golden in color, especially the females which are more of an off yellow to off white abdomen. In handling the adults it is obvious that they shun direct sunlight. I find them by turning over rocks close to the water's edge.

Collected August 2, 2011 from the Touchet River in Washington

Added by Bnewell on August 3, 2011

Collected August 2, 2011 from the Touchet River in Washington and added by Bnewell on August 3, 2011