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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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).
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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
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References
- LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.
- Merritt R.W., Cummins, K.W., and Berg, M.B. 2019. An Introduction to the Aquatic Insects of North America (Fifth Edition). Kendall/Hunt Publishing Company.
