Green Caddis

Other Common Names: Green rock worm
Scientific Name: genus Rhyacophila

This is a free-living caddis (doesn't build a case). As you might expect from the name, larvae are green and worm-like.

They favor riffles, and they often drift in the current--and are often swallowed by trout. A larva pattern is effective when drifted through riffles near the bottom.

Adults hatch in the afternoon from late spring through August, and pupa patterns are effective during the hatch. For a couple of weeks after the hatch, adults often land on the water and are taken by trout. This provides excellent dry fly opportunities.

Females swim or crawl underwater to lay eggs. You can fish a dry at this time, or go subsurface with a Soft Hackle or Diving Caddis pattern.

Characteristics

LARVA COLOR: Usually green, but can run to tan

PUPA SIZE: 8-16 mm

PUPA COLOR: Body--Green to brown. Shroud--tan to green

ADULT SIZE: 8-16 mm

ADULT COLOR: Wings--mottled brown to gray. Body--Green to brown

OTHER CHARACTERISTICS: Caseless (free-living) as a larva. Case, 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.

 

Click on the fly name to see the pattern. Click on the presentation to learn how to do it.

STAGE PATTERN SIZE/
COLOR
PRESENTATION WHERE
Larva Zug Bug 8-14
Green, browns
indicator, tight line Riffles, just below riffles
Sparkle Larva 8-14
Green, browns
indicator, tight line Riffles, just below riffles
Pupa Z Wing Caddis 8-14
Body: green, brown
indicator, tight line, shallow nymph Riffles, just below riffles
Soft Hackle 8-14
Body: green, brown
surface swing, shallow nymph Riffles, just below riffles
Deep Sparkle Pupa 8-14
Body: green, brown; Shroud: tan, green
indicator, tight line Riffles, just below riffles
Sparkle Pupa 8-14
Body: green, brown; Shroud: tan, green
indicator, tight line, shallow nymph Riffles, just below riffles
Adult Elk Hair Caddis 10-14
Body: green, olive, brown; Wing: brown, gray
standard dry fly Bankwater near foilage near riffles
X Caddis 10-14
Body: green, olive, brown; Wing: brown, gray
standard dry fly Bankwater near foilage near riffles
Goddard Caddis 10-14
Natural gray
standard dry fly, skating Riffles
Egg-layer Soft Hackle 10-14
Body: green, olive, brown; Wing: dark brown, black
surface swing, shallow nymph, rising nymph Riffles, backeddies below riffles, current seams
Diving Caddis 10-14
Body: green, olive, brown; Wing: dark brown, black
surface swing, shallow nymph, rising nymph Riffles, backeddies below riffles, current seams