The month of May and June the Yakima River will produce a  P.M.D. hatch.   By this time the river is seeing a multiple of hatches and at the Yakima river trout are feeding heavily on these Mayflies.

The Yakima River Pale Morning Dun Mayfly


These small mayflies have a one-year life cycle, living among the bottom of the river scrounging for food waiting until there time of emergence.

Once they begin there accent to the surface, shedding there nymphal shuck they break through the film and ride the current waiting for there newly formed wings to dry. 

They are highly vulnerable here and the trout wait in anticipation picking them off one by one.

The Pale Morning Dun has 3 long tails and a pale yellow/olive body.  Its wings are a light gray in color.



Order Family Genus Species Body Color Wing Color Emergence

Pale Morning Dun

EPHEMEROPTERA Ephemerellidae Ephemerella Infrequens Pale Yellow Pale Yellow Afternoon



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