Micro Caddis

Scientific Name: family Hydroptilidae

Microcaddis are caddis that are . . . well . . . small. Very small. So small you can easily miss them. In fact, very few fly anglers are aware of their existence, and even fewer carry imitations. Trout, however, can find them delectable. There may be many times that you are valiantly trying to match a mystery midge hatch when it's actually a microcaddis hatch.

Tactics and flies are a blend of those for midges and larger caddis. Just keep your imitations small, neat, and thin. No one said it was going to be easy.


How to Match a Microcaddis

Hatches are matched from Westfly's database of "standard" fly patterns.

Size 20-22 Soft Hackle. Body and wing: dark brown, green
moderate to slow flows: surface swing, deep swing
Size 20-22 Elk Hair Caddis. Body: dark brown, green
moderate to slow flows: standard dry fly
Size 20-22 Soft Hackle. Body: dark brown, green
moderate to slow flows: surface swing


LARVA COLOR: Varies; usually a dark brown

PUPA SIZE: 2-5 mm

PUPA COLOR: Varies; usually on the dark side

ADULT SIZE: 2-5 mm

ADULT COLOR: Varies; typically dark brown

Other characteristics: Generally, larva is caseless until it nears maturity. Body, wing, and shroud colors can vary, so it's always best to check a natural insect where you are fishing. Body and wing colors will darken when the insect is ready to lay eggs.