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Mayfly Species Epeorus longimanus (Slate Brown Dun)

Epeorus longimanus and Epeorus albertae are the two most common Epeorus species in the West.  

Where & When


Region: West

Time Of Year (?): June through mid-August, peaking in mid-June to mid-July, for about one week in any given location

Altitude: Above 5,000 feet
According to Ernest Schweibert in Matching the Hatch, the trout "respond very well" to this hatch. Fred Arbona in Mayflies, the Angler, and the Trout called the hatches disappointing, noting that they may be overshadowed by simultanenous hatches of Rhithrogena hageni.

Hatching Behavior


Time Of Day (?): Anytime; sometimes concentrated in late morning

The nymphs emerge sporadically on the bottom in the shallows and rise to the surface as duns.

Spinner Behavior


Time Of Day: Midday

Habitat: Fast water

Nymph Biology


Current Speed: Fast

This species is found more in the cold headwaters than Epeorus albertae and Epeorus grandis.

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