Mayfly · Aquatic insect
Patagonian Mayfly (Large)
Meridialaris chiloeensis
Size
7–10mm
Hook size
#16–14
Hatch window
Season November–MarchPeak time 17:00–21:30 (evening dun & spinner)
Water temperature
14° peak
9°20°
Hatches from 9°C, peaking at 14°C, tailing off by 20°C.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
Grey Wulff
Adams Parachute
Parachute Spinner
Ecology
Where you'll find this
- PatagoniaPresent
Present throughout