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Ephoron leukon (mayfly hatch)Ephoron leukon is a very prolific mayfly hatch that can come off in such numbers that it appears like a white snow blizzard of mayflies. Ephoron leukon and Ephoron album are commonly found across the country on many streams and rivers and is often referred too as the White Fly hatch. In August, some Wisconsin rivers and streams will explode at dark with white mayflies dancing across the water. It's an amazing sight to behold! Ephoron leukon is a burrowing-type mayfly and comes out of the sand and silt stream bed to hatch in August at dusk and continues into the night hours. The male duns quickly molt into spinners (2 tails) and come back over the water to mate with the female mayflies carrying their yellow egg sacks (females don't molt). Unlike other mayfly species, Ephoron leukon emerges, mates, lay their eggs and die all in the same night. Shortly after mating the surface of the river is blanketed with hundreds of spent, floating white mayflies. See photos below:
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