a wonderful Hydropsyche nymph step by step by Barry Ord Clarke via Mustad.
” In recent years, mostly through the success of the Czech national fly fishing team, this style of nymph has become extremely popular especially for short line river fishing. When tying this pattern there are a couple of points to note. Regarding weighting the Hydropsyche nymphe, you can apply as much weight as you require as an under body or in the form of tungsten beads under the thorax. Just try to retain the natural body shape. The plastic strip that we use as the shell back shouldn´t be made from a strip from a regular plastic bag, but of a much heavier gauge plastic. If you examine some of the plastic bags that contain your fly tying materials you will see that some are much thicker than others, especially at the top of the back where it locks, this is perfect for this pattern. If you have problems finding this heavy gauge plastic you can buy shell back or another similar material. When applying the dubbing, step 5, you should try and fade one colour of dubbing into the next so it appears to be a natural transition, this you can do when spinning the dubbing onto the tying thread. It also helps to brush the dubbing and open the fibres when on the hook. ”
tying instructions step by step here
the Hydropsyche (Netspinning Caddis flies) larvae can generally be found in the faster moving parts of streams and rivers. they’re filter-feeders, eating algae, detritus, and particles of organic material captured in their nets. trout eat them like candy !
seen from below
bug info and pics via BugGuide. bon appétit !