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Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large Brown Trout that only touch streamers for the rest of the year.

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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