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This is more of a class of fly rather than just one fly. A very generic representation of a caddis nymph tied on a Czech nymph type hook. A good buggy looking fly that also has a hot spot emerging wing of UV material.

Caddis fly (or Sedge) are of the order Trichoptera and are common throughout the year but with the greater concentrations occurring from September through to March. They inhabit both running and still water and are a dominant food source for most trout often reputed to represent up to 70% of a trout's diet.

Their life cycle is similar to the Mayfly and all cased caddis emerge as part of their life cycle and its during this process or when they are accidentally dislodged from their nest or where their nest is dislodged that they become vulnerable to trout.

This fly whilst not being representational of any particular caddis is a good buggy looking fly that when tied with sufficient weight will stay in the fish catching zone and incorporates a hot spot in the form of a coloured ultra violet (UV) emerging wing.

Tied in a number of colour and material combinations a selection of bead head Caddis nymph is a must fly for any river fly box.

Pearl wing buds work so well because they have enough of a form and function of a bubble of air and of course trout associate bubbles attached to the top of buggy looking things as an air sack on an emerging nymph.	Red probably is used as a trigger colour in more flies than any other colour. It is of course associated with injury and blood and both are real triggers for predatory fish.	Orange is a classic trigger colour for trout. I don't know if its similarity to the colour of trout eggs or for some other reason. All I know is that it works. For other great flies that incorporate the colour orange have a look at dunkeld and orange spider.
Lime, Chartreuse or Shades of yellow are colours that are classically associated with a wide range of caddis particularly with stick caddis and sand caddis grubs. Its therefore not surprising that a lime, chartreuse or yellow hot spot on a fly that ostensibly has the other colours and form of say a stick caddis works.	Is it just that trout like pink or do they in fact associate it with blood or the colour of trout eggs. I don't know but I do know that it's a great trigger colour on trout flies.	This generic representation of a caddis nymph tied on a Czech nymph type hook is one of my favourites. A good buggy looking fly that also has a subtle hot spot emerging wing of UV material.

Materials for brown caddis

Process

A	Most beads have a large opening at one end and a smaller opening at the other. Slide a tungsten bead over the point of the hook small opening first and position it behind the eye of the hook. Wind the thread in touching turns to the bend of the hook. Understanding hooks If your going to add extra weight do that now. On this size #10 fly I have added 12 wraps of .15 mm lead to the front half of the hook shank. Adding weight to a fly Tie in a tail equal 1/2 to 2/3 the length of the hook shank. Resist the temptation to make the tail too bulky and too long. Tie in a length of copper wire.

B	Dub on a slim tapered body along the length of the fly.

C	Wind the wire ribbing along the body of the fly forming 5 or 6 segments. Segments on flies Take several touching turns of the copper wire behind the bead head before worrying off the excess wire.

D	Take a small bunch of UV dubbing and tie it in just a little behind the bead. This is only a subtle hot spot so resist the temptation to tie in too much. Pinch the excess dubbing off leaving just a small amount to represent an emerging wing bud.

E	Roll a small amount of the dubbing onto the thread and dub on a collar between where the wing bud is tied in and the back of the bead. Take several tight wraps of thread directly behind the bead. Whip finish behind the bead, trim the thread and varnish the thread behind the bead and the bead itself. If you don't varnish the bead it will tarnish quite quickly.

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