Rock Worm
16 Jun 2025
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Rock Worm
A subsurface pattern that mimics caddis larvae, a prevalent food source for trout and other bottom feeding fish species.
How it's tied
The Rock Worm is tied on a curved or straight nymph hook, with materials selected to replicate the characteristics of natural caddis larvae. The body is typically formed using a fine dubbing, often in colors that match local caddis populations, such as green, tan, or brown.
A rib of fine wire or contrasting thread is wound up the body, giving the impression of the segmented structure of a caddis larva. The thorax area can be built up slightly with extra dubbing, and some tiers may include a bead at the head for additional weight and flash.
One of the defining features of the Rock Worm is the soft hackle collar, typically made from a partridge or hen feather. This provides lifelike movement underwater and simulates the tiny legs of a caddis larva. Some of the patterns don't have this, but instead use other materials to simulate the legs, like the one you see in the picture above.
What it mimics
The Rock Worm is specifically designed to mimic caddis larvae, a crucial part of the diet for trout and other freshwater fish. The segmented body, soft hackle collar, and realistic colors help the fly mimic the size, shape, and behavior of natural caddis larvae.
Where it's used
The Rock Worm can be effectively fished any freshwater, particularly in areas where caddis populations are high. It can be fished alone or as part of a multi-fly setup, under an indicator or euro nymphing rig.
Fly tying video for the Rock Worm
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