Search rivers, reports, guides, fish, hatches, and more
Hatches › Mayfly
Tricorythodes · genus
Tiny stout mayflies that can bring selective trout up when duns and spent spinners blanket the surface.
Category
Mayfly
Category
The insect or forage category for this profile.
Size
Tiny; commonly matched with very small mayfly patterns.
Size
Typical size range anglers imitate on the water.
Key stages
Eggs, Nymph, Emerger, Dun, Spinner, Egg Laying Spinner, Spent Spinner
Key stages
Life stages most relevant to fly fishing this hatch or forage.
Water types
rivers, spring creeks, tailwaters, gentle glides
Water types
Water types where this bug or forage is commonly found.
Trico refers here to Tricorythodes, a genus of little stout crawler mayflies in the family Leptohyphidae. Anglers key on them because their small size and multi-stage surface activity can make trout highly selective.
Female mayflies lay hundreds to thousands of eggs in or near the water. These eggs sink to the stream bottom, where they will eventually hatch.
Mayfly nymphs reside on the streambed, feeding and growing. They undergo many molts as they develop underwater.
The nymph rises to the water's surface, where it transforms into an adult and begins to hatch from its nymphal shuck.
A freshly emerged adult mayfly, also known as a subimago, rests on or just above the water's surface, preparing for its final molt.
Mated adult mayflies, called spinners, take to the air for reproduction. This is their final, sexually mature form.
The female spinner returns to the water's surface to deposit her eggs, continuing the life cycle.
After successfully laying eggs, adult mayflies die and often float, or 'spend out,' on the water's surface, becoming an easy meal for fish.
Nymph
Hopper Juan Ramirez
Materials
Emerger
Patagonia
Materials
Dun
Flies By Fredo
Materials
Spinner
Charlie's Fly Box
Materials
Egg Laying Spinner
Josh Varner
Materials
Spent Spinner
tightlinevideo
Materials
Trico
One species, multiple rivers.
