Solano Fly Fishers
Czech Nymph
 
Materials
Hook:

Underbody:
Thread:
Shellback:
Ribbing:
Abdomen:
Thorax:
Hot Spot:
Marking Pen:
Czech nymph or scud hook sizes 6-14 (I prefer Knapek brand Czech Nymph hooks or a Partridge K4A)
Adhesive backed lead tape
Uni 6/0, White
Tan or olive scud back, trimmed to 1/8"
Flat gold holographic tinsel and 5x mono tippet
Synthetic dubbing, olive
Squirrel dubbing, dark brown
(optional) Synthetic dubbing, bright colors (pink, orange, red, yellow, etc)
Dark brown or black
 

The variations of this pattern are endless and this example is only a guide. Experiment with colors and sizes to best match local insects or develop attractor patterns. A little research on the topic will reveal many different styles of patterns in addition to the one shown that imitate mayflies nymphs, caddis larvae as well as aquatic worms.

Czech style nymphs come in many styles but they have two things in common. They have thin profiles and they are heavy. They are designed to sink quickly and are fished on multiple fly rigs. The use of adhesive backed lead tape opposed to lead wire gives the fly weight without bulk, allowing it to cut through the water and sink quickly.