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Damselfly (Zygoptera)

Other, in the drift all year, active in water between 55 and 78°F, and imitated at #10–14. Recorded from northern lower Michigan, southern lower Michigan and the Upper Peninsula, where 1140 Michigan rivers on this site carry a page.

Damselfly, Zygoptera
Emerald damselfly (Lestes sponsa) adult male — Charles J. Sharp, CC BY-SA 4.0, via Wikimedia Commons.
Subbasins with trout water where it is on record: 42 of Michigan's 59.
See Michigan's trout water on the live map → Every reach coloured by water temperature — the water these hatches come off.

What it is

Other · Zygoptera · nymph → adult

The adult is the slim blue or green needle that perches with its wings folded along the body. The nymph is equally slim, olive to tan, with three leaf-shaped tail gills it uses like a paddle.

The nymph is slim, three-tailed and a genuinely good swimmer, taken all year in weedy and slow water. The adults are on the water in midsummer, and a trout that eats one has usually taken it as it dips to lay eggs rather than in flight.

When it hatches

In the water twelve months a year, which is why the panel in the app ranks it below anything with a season.

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peak shoulder not recommended

Water conditions

The band is a water temperature, not an air temperature, and it is the range in which this insect is worth fishing — for a mayfly that is the emergence window; for a scud or a midge it is simply the range trout will still eat one in.

55°F 78°F

Active from 55°F to 78°F. On this map that is cold, cold-transitional, cool, warm water — the band crosses 3 of the three breaks the river colours use. Breaks at 58, 64 and 70°F.

Stages

What the insect is doing, and what that means for what you tie on.

StageWhat it is
nymph Lives in weed and slow margins and swims in a distinct side-to-side wriggle. Taken all year; the fly should be moved, not drifted.
adult On the water in midsummer, usually when a female drops to lay eggs or a pair falls in coupled. A trout eating one has taken it off the surface, not out of the air.

Matching flies

4 patterns in this book imitate the Damselfly, across its stages. Which one to tie on follows the stage the water temperature says it is in — the app makes that call on a live reading; this page lists the whole set.

Where to find it right now

The rivers with a page here that sit in this insect's regions, with a USGS gauge reporting water temperature. This list is re-ranked against the reading each gauge is sending now and today's date, so it is live — the fallback below it, if the readings do not arrive, is each river's measured July mean.

Regional presence

Regions, not collection records. This insect is recorded from the coarse regions below; nobody has surveyed which named river it has been caught on, and this page will not pretend otherwise.

Rivers in these regions with a page here

Related hatches

Same family, or overlapping this one's calendar on the same water.

Open the trout map →Every trout stream near you, coloured by today's water temperature.