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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

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 Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington
This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
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 Ecclisomyia (Early Western Mottled Sedges)

The two Western species Ecclisomyia conspersa and Ecclisomyia maculosa are often found in the same streams.

Where & when

Preferred waters: Mountain streams

In 76 records from GBIF, adults of this genus have mostly been collected during July (39%), June (30%), August (13%), and May (11%).

In 54 records from GBIF, this genus has been collected at elevations ranging from 66 to 11886 ft, with an average (median) of 6594 ft.

Genus Range

Larva & pupa biology

Diet: Plant matter and plankton

Start a Discussion of Ecclisomyia


Caddisfly Genus Ecclisomyia (Early Western Mottled Sedges)

Genus Range
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