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Czech Nymph
Pattern Image:
General Description:
The gray sedge in the adult stage is perhaps better known as the green rock worm in the larval stage. The larvae live in riffles and pocket water, wherever the current is fast and there are many spaces between stones. They're predaceous, hunting mayfly nymphs and midge larvae and anything else that doesn't hunt them. Green rock worms are free-living; they build neither case nor retreat until ready for pupation. Because there are 40 to 50 species of them, they're out there in riffles at all times, getting into the drift, being eaten by trout. Emergence can be anytime from spring through early fall. They are most important in summer, when you can see adults flying over riffles at mid-day. Emergence and egg-laying flights are both during daylight, often in sunshine, unlike most caddis, which emerge at dusk or after dark. Dressings for all three stages, larva, pupa, and adult, should find places in your fly boxes.
Stage Description:
Green rock worm larvae, like all aquatic predators, are loners, their populations scattered. You'll collect one or two in almost any riffle sample you take, but they do not colonize, and you'll never find them as dominant as you will their look-a-likes, the net-spinning larvae of the spotted sedges. But trout are always on the lookout for them, and their imitations make excellent searching dressings. Fish them at any time of day. Rig to get them on the bottom, and tumble them there with dead-drift presentations. They range in size from 8 to 14. They're well-known as models for the famous Czech Nymph.
Hook:
Curved scud, size 8-14.
Thread:
Black 3/0 or 6/0.
Body:
Olive dubbing.
Category:
Trout Flies: Imitators
Insect Family:
Caddisflies (order Trichoptera)
Insect:
Gray sedge; green rock worm (Rhyacophila sp)
Stage:
Larva
Pattern Name:
Czech Nymph
Weight:
15-25 turns non-lead wire.
Rib:
3X or 4X monofilament
Back:
Black Thin Skin.
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