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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.

Dorsal view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
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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Stonefly Species Acroneuria lycorias (Golden Stones)

Where & when

Time of year : Early June through mid-July

This is a major species in the Midwest.

In 27 records from GBIF, adults of this species have mostly been collected during June (44%), May (22%), July (19%), and April (7%).

Species Range

Specimens of the Stonefly Species Acroneuria lycorias

1 Female Adult
2 Nymphs

Start a Discussion of Acroneuria lycorias

References

Stonefly Species Acroneuria lycorias (Golden Stones)

Taxonomy
Species Range
Resources
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