When does the White Fly hatch?

August–September, typically Dusk into dark. It starts from about 18°C, peaks around 22°C and tails off by 27°C.

What flies imitate the White Fly?

White Fly, White Wulff, White Fly Spinner, Ephoron Dun, typically on a #16–14 hook.

How big is the White Fly?

Spinner stage: 9–12mm. That matches a #16–14 hook.

Mayfly · Aquatic insect

White Fly

Ephoron leukon

Size

9–12mm

Hook size

#16–14

Hatch window

Season August–SeptemberPeak time Dusk into dark

Water temperature

22° peak

18°27°

How fish feed on it

Spent white bodies covering the surface in the dark. It is chaos, the fish are gorging, and the practical answer is a fly you can actually see on the water rather than the most accurate one.

Flies that imitate this

White Fly

White Wulff

White Fly Spinner

Ephoron Dun

Ecology

Rivers & stillwaterFreestone riversTolerates poor water

Where you'll find this

North America — EastPresent

Present throughout

Identification

Ephoron leukon , the white fly , is a species of pale burrower mayfly in the family Polymitarcyidae. It is found in North America.

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