Czech nymphs are an ideal fly pattern to imitate a wide array of tubular shaped larva such as caddis, riffle beetle, water snipe. Early Czech nymphs were mainly designed to imitate gammarus and caddis larva. Noted British angler Oliver Edwards coined the term Czech Nymphing. You can read more about the history and techniques of fishing Czech Nymphs here.
The following collection are my most productive Czech Nymph patterns that fish well solo or in a multiple fly rig. On sizes 14 and larger, I apply weight to the underbody of the fly to aid in fishing as a single fly with proper buoyancy or fishing in shallow riffles.
My favorite color combination of Czech nymph. One of that I frequently run out of in my fly box as I am always giving them away.
I originally devised this color combination to cover the yellow/green stones of summer. I use this fly when the Yellow Sallies are hatching. Even when the Sallies are not hatching, this color attracts a lot of attention.
A dark version of the Green Papaya. Subtle pearlescence emminate when viewed from various angles giving the fly a unique quality. Flashy but not garish. Great attractor/imitative pattern.
Cover the lighter spectrum of free living caddis or other larva of similar shape and color. Hot Orange spot for added allure.
I love crossover patterns that imitate several possibilities at once. I have had success over the years with variations of a czech nymph tied with stonefly colors. The Green Papaya is one such example of a Czech Nymph in stonefly regalia.
This large pattern is weighted and designed to be fished in the riffles anywhere that golden stones reside. Anglers bound for the Deschutes or Madison should definitely have these in thier box. I recently used them on the Yampa river in downtown Steamboat Springs to pick up some difficult fish hiding in the pockets behind boulders.
I spent years developing this color combination to be "just right" to the many natural free-living caddises I have sampled throughout the American West. This fly requires an exact blend of furs to get the color right and the right amount of glint to get the fish's attention but not too flashy to turn them off. I spent hundreds of hours experimenting every day on the river to get everything right in the pattern. The best time to fish this pattern in the spring.