This weeks Fly Friday is from a new PRO-Team member Jack Kos, it's The Bomb Squad...

The Bomb Squad There are moments in fly fishing when all you need is a dainty dry fly, when the fish are sitting high in the column and their rhythm tells you immediately that they'll come to the surface to feed. And then there are the days when the fish are glued to the bottom, stiff and unreceptive to any lightly weighted offerings.

This fly is for those days. I first became aware of this pattern through my friend Stephen Beville, but I have subsequently seen similar patterns from a few different sources. The be all and end all of this fly is weight. Sure, it has the basic profile of a caddis pupa, but so do a lot of excellent patterns that are much more pleasant to cast. What this fly offers is the ability to sink itself and any trailing nymphs down into the zone.

And considering they weigh 1.3 grams each, they get into that zone quickly. The construction, and it does at times feel more like construction than tying, of the fly is fairly basic. One important note is to use strong thread to lash the tungsten body on to the hook shank. A little glue doesn't go astray either. Once the body is affixed it's as simple as covering it in some sort of body stretch coating and adding a collar. Oh, and remember to duck when you cast it.

Hook: Partridge Czech Nymph #10

Body: Green and Brown Body Stretch

Collar: Black Possum

Tungsten: Large Tungsten Body and 4mm Tungsten Bead

Jack Kos

I'm a 26 year old fly-fishing obsessive currently completing a PhD in history on the introduction of brown trout to New Zealand. When I'm not researching trout in archives or old newspapers I'm either found miles up a backcountry river with a pack on my back or huddled over my vise with a strong black coffee.

My focus is on trout flies designed for New Zealand's demanding backcountry trout; subtle and natural flies tied on good strong hooks. I particularly enjoy taking classic worldwide patterns and adapting them to New Zealand conditions. To my surprise, in the past couple of years the act of tying the fly has become almost as enjoyable to me as fishing the fly. Almost.