The Rhyacophila Caddis is found in almost all rivers around the UK. It’s a free-living caddis, meaning it doesn’t build a ‘house’. The Larvae like caddis favours shallow riffles and often gets caught in the current and drifts freely downstream, this making them ideal food for trout and grayling. The ‘Rhyacs’ hatch later in the afternoon and the adults can provide some great dry fly action when they return to the water. Tying a Rhyac caddis can be complicated, but here’s a simple little pattern we’ve been using for the grayling this winter.
Attach your favoured hook into the vice, here I’ve used a Fulling Mill Czech Nymph hook. Run your thread along the body to the extreme bend in the hook. Wind a layer of lead into the shank of the hook to add some weight. A tungsten bead can be used but I like these on dropper so a lead underbody is usually enough weight. With your thread, make sure you taper the body to give a slim, streamline effect and ensure you cover the lead with the thread, once the dubbing gets wet, you will get a green glow from the underbody, if you forget to do this, the lead will dampen the colour of the body.
For the rib I’ve used the tag end of thread where I first tied onto the hook. Attach two sides to the fly, FlyBox bleach dyed peacock herl is a great material to imitate the legs. Dub a TIGHT rope of dubbing onto your thread ensuring you get a thin from and back end with a slightly thicker abdomen. In touching turns wind the dubbing towards the eye and pull the side legs along the length of the hook. Secure the body and legs in place with the rib with evenly spaced turns. Tie off and add some black pen to the head of the fly to imitate the Rhyacophila’s wing bud cover.
Fly Tying Materials
Hook: Fulling Mill Czech Nymph 12
Thread: Glo Bright No12
Underbody: Medium Lead Wire
Rib: Glo Bright No12
Body: Rhyac Green Dubbing
Sides: Bleach Dyed Peacock – Chart
Colour: Black Pen