When does the Ephemera strigata hatch?

January–May, typically 17:00–20:00. It starts from about 9°C, peaks around 13°C and tails off by 18°C.

What flies imitate the Ephemera strigata?

Sakasa Kebari, CDC Olive Emerger, Comparadun, typically on a #14–12 hook.

How big is the Ephemera strigata?

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

Mayfly · Aquatic insect

Ephemera strigata (Mid-Reach Keiryu Mayfly)

Ephemera strigata

Size

12–16mm

Hook size

#14–12

Hatch window

Season January–MayPeak time 17:00–20:00

Water temperature

13° peak

9°18°

How fish feed on it

By the time the spinners are down the fly has finished its job and is simply lying there, spent, wings flat in the film, going nowhere. Trout know the difference between something alive and something that's stopped trying, and they take spinners with a quiet, unbothered sip that's easy to miss if you're still watching for something splashier. Look for them on the glides and in the slack water, wherever the current gathers what's left.

Flies that imitate this

Sakasa Kebari

CDC Olive Emerger

Comparadun

Ecology

Rivers onlyFreestone rivers

Where you'll find this

East AsiaPresent

Present throughout

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