My friend, Vince Ordonez, brought the Czech Nymph to my attention. The Czech Nymph gets its name from the Czechoslovakian National Fly-Fishing Team who used this fly in the world championships. Apparently, the fly worked very well.
This pattern really reminds me a lot of the Barr Net Builder Caddis.
I have used the Net Builder with great success on the Colorado River, near Parshall, Colorado, where it imitates the numerous free-living, net building caddis larvae. These bugs can get quite large. A pattern tied on a size six hook is not too big, but I more commonly fish it in size ten through fourteen.
Fish the Czech nymph with split shot on the bottom of the river with a dead drift. The Net Builders are present year round and the fish will really key in on them in the early spring and summer. I really like the look of this fly and look forward to adding it to my arsenal. Spring is here and it wont be long before a few trout get cross-Czeched!