Trico Spinner Falls: Tiny Flies, Giant Summer Rises

Description

The Trico (Tricorythodes) is famous—or infamous—for being the "White-Winged Curse." These are among the smallest mayflies anglers fish, typically sizes #20-26. Despite their microscopic size, they hatch in clouds so dense they look like smoke or morning mist. Tricos are a late summer staple on tailwaters and spring creeks. The defining event is not the dun hatch (which is often ignored) but the massive spinner fall, where trout line up in pods to sip millions of dying insects.

Life Cycle Stages

Nymph

The nymph is tiny, stout, and dark brown to black. They are often covered in silt or debris. Crawling slowly among the weeds, they are rarely targeted by anglers simply because the adults are so much more available.

Recommended Fly Patterns

Blow Torch

#14-#18

Olive, Brown, Black

Pheasant Tail Nymph

#14-#20

Brown, Copper, Olive

Lightning Bug

#16-#20

Pearl, Silver, Olive

Hare's Ear Nymph

#12-#18

Natural, Olive, Tan

Red Dart

#12-#18

Red, Purple, Blue, Black

Slim Shady

#18-#24

Olive, Brown

Prince Nymph

#12-#18

Peacock, Brown, White, Gold

Duracell

#14-#18

Brown, Black

Hare's Ear Jig

#10-#18

Natural, Olive, Brown, Black

Spanish Bullet Perdigon

#14-#18

Olive, Brown, Copper, Black

Frenchie

#14-#18

Brown, Olive

Copper John

#14-#20

Copper, Red, Green, Black

Rojo Midge

#18-#22

Red, Black, Silver, White

Black Beauty

#20-#24

Black

Top Secret Midge

#20-#24

Brown, Black, Gray, White

Zebra Midge

#18-#22

Black, Red, Olive, Cream

Brassie

#18-#22

Copper, Olive, Black

Emerger

Duns emerge early in the morning, often at first light. Males hatch first during the night or pre-dawn. Females hatch in the morning.

Recommended Fly Patterns

RS2

#16-#22

Gray, Olive, Black

Sparkle Dun

#14-#22

Pale Yellow, Olive, Tan, Gray, Brown, Green

Barr's Emerger

#16-#24

Olive, Pale Yellow, Gray, Tan, Brown

Klinkhammer Special

#12-#18

Tan, Olive, Peacock, Black

WD-40

#18-#22

Gray, Olive, Brown, Black

Rojo Midge

#18-#22

Red, Black, Silver, White

Black Beauty

#20-#24

Black

Top Secret Midge

#20-#24

Brown, Black, Gray, White

Adult

The male dun is tiny and black. The female often has a green abdomen. But the most recognizable stage is the spinner. Trico spinners have stout black bodies (females appear chunky with eggs) and distinctive white wings that lie flat. The "double wing" pattern is common because Trico wings are relatively broad for their size.

Recommended Fly Patterns

Rusty Spinner

#16-#20

Rust, Brown, Tan, Orange

Trico Dun

#20-#24

Black, Gray, Olive

Trico Spinner

#18-#24

Black, Gray, White

Purple Haze

#14-#20

Purple, Gray

Parachute Adams

#12-#20

Gray, Brown

Parachute Drake

#10-#14

Olive, Gray, Brown, Tan

Royal Wulff

#10-#18

Brown, Red, White

Parachute BWO

#16-#22

Olive, Gray

Parachute PMD

#14-#18

PMD Tan, Olive, Yellow

Griffith's Gnat

#18-#22

Black, Gray

Habitat

Trico nymphs are crawlers that inhabit silty, mossy, or vegetated substrates in slow-moving rivers, tailwaters, and spring creeks. They love stable flows and consistent water temperatures. Vegetation is key; nymphs crawl among the moss and weeds. You typically won't find them in fast, tumbling freestone streams, but in the flat, glassy pools of nutrient-rich rivers.

Behavior

The Trico life cycle is clockwork.

The Hatch: Duns emerge early morning (7 AM - 9 AM).
The Swarm: Males swarm in clouds over riffles.
The Mating: Females fly into the swarm, mate, and fall.
The Spinner Fall: By mid-morning (9 AM - 11 AM), dead spinners blanket the water. This is when the fishing turns on. The "sip" of a trout eating a Trico is subtle and rhythmic. Fish will hold in a feeding lane and eat 40-60 bugs a minute.

Fishing Information

Seasonality July through September (Summer/Early Fall).

Tactics

Timing is Everything: Arrive early. If you show up at 11 AM, you missed it.
Double Wings: Use spinner patterns with spent wings (Z-lon or packing foam). Visibility is hard, so look for your tippet if you can't see the fly.
The Cluster: Since they are so small, fishing a "cluster" pattern (griffith's gnat) can sometimes mimic a clump of mating tricos.
Drag-Free: Micro-drag is the enemy. Use long leaders (12ft+) and light tippet (6x or 7x).
Sun Angle: Position yourself so the glare helps you see the wings of your fly but doesn't blind you to the fish.

Recommended Patterns

Nymph: Zebra Midge (black, #22) - Trico nymphs look like chunky midges
Emerger: RS2 (black, small)
Adult: Trico Spinner (organza wing), Drowned Trico, Griffith's Gnat (#22-24)

Conservation Status

Tricos rely on stable, weed-rich environments typical of tailwaters. Protection of minimum flows and management of nutrient loads (to prevent excessive algae but support healthy weed growth) are vital.