CADN3. Cream Peeping Cased Caddis (Sedge) Nymph

Cased Caddis Nymphs
Research has shown that on many river systems caddis (Trichoptera) are a more important food source than mayflies. This is contrary to the fly fishermen’s common held belief that the mayfly is top of the aquatic menu for most trout. There are three main types of Caddis Larve, case builders, spinners, and roamers. The last two produce a silken strand like a spider. To prevent themselves being washed away when moving down fast flowing streams they will attach their line to a rock and then winch themselves down stream. This is when they are exposed to hungry trout. In times of very strong currents after rainfall all three types of caddis can be swept away and eaten by lurking predatory fish. The third type of Caddis Larva build a sticky tube around their body and then cover it in small stones, sand, silt, small sticks and other vegetable matter that is on the river bed. It is a clever way of camouflaging themselves so they blend in with their surroundings. The case around their lower body is also believed to function as body armour as it protects them from small stones and other material hitting them in fast flowing water. It also means that no two cased caddis are identical. One end of the tube is open to allow the larva to poke its head and legs out. It uses its legs to hook onto rocks and vegetation to help it navigate around the river bed and feed. When it wants to move to a new area to find more food it lets go and floats with the current. Legs out ready to latch onto another rock, stick or leaf. Trout look out for the head and lighter body of the Caddis Larva sticking out from their protective casing. From experience they know that this is food floating past in a crunchy outer shell.

Caddis Nymph Fly Fishing Tip
If you are going to a new fishing location carry a pot of superglue and some black green and cream waterproof marker pens in your fishing bag. I know this sounds strange but if you trawl the riverbed with a small net before you fish and find cased caddis that look different to the ones in your fly box coat your fly with some super glue and role it in the same coloured sand, dirt and gravel that covers the river bottom. This is a variation on ‘Matching the Hatch’. Make sure this material is dry before you stick it to your fly. Take it from the river bank or path. You can use the marker pens to alter the colour of the larva on your fly if necessary to match local insects.

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