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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.

Mayfly Species Epeorus albertae (Pink Lady)

This is one of the two most common Western species of Epeorus, and its spinner falls can be important.

Where & when

Time of year : July through August

Preferred waters: Slower than other mountain Epeorus species

Altitude: 5,000 to 6,000 feet

Hatching behavior

Water temperature: Warmer than other Western Epeorus species

The Epeorus albertae emergence is usually too sparse to be important.

Spinner behavior

Time of day: Early morning or late afternoon/evening

These are the most fishable events produced by Epeorus albertae.

Nymph biology

Current speed: Fast

Specimens of the Mayfly Species Epeorus albertae

5 Male Spinners
3 Female Spinners
3 Female Duns
1 Male Dun
Male Epeorus albertae (Pink Lady) Mayfly Dun
I collected this male dun with a female dun and a female spinner of the same species. Identification was initially difficult because I didn't catch a male spinner, and this dun was missing its legs. I was able to tease the spinner's penes out of the dun's shuck after it expired, although the shape was pretty similar. Fortunately, the shape is a distinctive match to the Epeorus albertae species group. In the key in Needham et al (1935), it keys to Epeorus youngi, which is now considered a synonym of albertae. It's also a very plausible dun version of this spinner collected a few years earlier, a few drainages to the north, at a similar time of year. Additionally, the female dun and spinner collected with this one match very closely those I've collected in the past.

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