Ryan Brennecke / The BulletinBH Caddis Larva, courtesy The Patient Angler.

In Czech nymphing, there is no indicator, no lead attached to the line. Small, heavy patterns are essential. The technique capitalizes on the trout’s tendency to feed opportunistically on food borne on the current. Caddis pupae, larvae and scuds are the main food sources in play.

This caddis larva pattern is a good choice to run with one or two other imitations. When using a triplet of flies, knot the heaviest one in the middle to keep the other two down near the bottom.

Tie this Beadhead Caddis Larva pattern on a No. 12 curved nymph hook. Slide the bead up to the eye then tie in a length of copper wire. For added weight, wrap 10 to 15 turns of lead behind the bead. Build the body with insect green or blue-green dubbing then rib with the copper wire. For the thorax, use dark copper or brown dubbing. Add pheasant tail fiber “legs” and finish with two more turns of dubbing behind the bead.

— Gary Lewis, for The Bulletin