Sow Bug
Aquatic sowbugs (isopods) are present in enormous numbers in many limestone spring creeks and tailwaters, and trout vacuum them up constantly. Unlike scuds which swim, sowbugs crawl — so fish your imitation with a very slow, deliberate dead-drift right on the bottom. The flat profile and mottled gray-brown dubbing precisely match the natural's appearance. A critical pattern on spring creeks like those in Pennsylvania's limestone valleys.
- Type
- nymph (Caddis)
- Hook sizes
- #14–18
- Target species
- trout
- Difficulty
- beginner
- Best seasons
- spring, summer, fall, winter
Materials
- hook: Scud hook #14–18
- thread: Gray 8/0
- shellback: Gray Antron yarn or Scud Back
- body: Gray or gray-brown Sowbug dubbing, flat
- ribbing: Fine silver wire
Tying steps
- Mount a size 14–18 scud hook; start gray thread.
- Tie in fine silver wire ribbing and gray Antron for shellback at the bend.
- Dub a flat, wide body of gray or gray-brown dubbing — use the scud hook to flatten the profile.
- Pull the shellback over the body and tie off; wind the rib in 6–7 spirals.
- Pick out the side fibers to suggest legs.
- Build a small head; whip finish and cement.
- Apply head cement to the thread wraps holding the shellback in place at both ends of the hook.
- Inspect the fly from above — the shellback should cover the full width of the body, mimicking the isopod's flat shell.
- Check the shellback Antron is flush against the full width of the body with no gaps or wrinkles — if gaps appear, apply light thread pressure at the tie-down point.