Nymphs
Green Rock Worm
The Green Rock Worm imitates free-living Rhyacophila caddis larvae — the bright green caterpillar-like insects found clinging to rocks in every freestone river. A simple green dubbing body with a dark head is one of the most underrated nymph patterns in fly fishing.
Frequently Asked Questions
What size Green Rock Worm should I use?
The Green Rock Worm is most commonly tied in sizes 12–16. Choose smaller sizes for clear water and pressured fish, and larger sizes for faster or off-color water.
What does a Green Rock Worm imitate?
The Green Rock Worm primarily imitates Rhyacophila caddis larvae, green rock worms.
Pattern Details
- Category
- Nymphs
- Sizes
- 12–16
- Colors
- Bright green, Olive-green
- Weight
- Tungsten, Brass
- Hook Styles
- Curved nymph, Standard nymph
- Imitates
- Rhyacophila caddis larvae, green rock worms
- Water Types
- freestone
Target Species
rainbow troutbrown troutbrook troutcutthroat trout
Pattern Details
- Category
- Nymphs
- Sizes
- 12–16
- Colors
- Bright green, Olive-green
- Weight
- Tungsten, Brass
- Hook Styles
- Curved nymph, Standard nymph
- Imitates
- Rhyacophila caddis larvae, green rock worms
- Water Types
- freestone
Target Species
rainbow troutbrown troutbrook troutcutthroat trout