Mottled Sculpin
Cottus bairdii
Mottled Sculpin is a small, bottom-dwelling freshwater fish of cold, clear streams and rivers in North America. It hides under rocks by day and forages on aquatic insects, crayfish, and other benthic prey at night or in low light.
Identification points
- Large, flattened head with a broad mouth and eyes set high on the head
- Mottled brown and tan camouflage pattern that breaks up the body outline
- Two distinct dorsal fins, with a short spiny first dorsal and longer soft-rayed second dorsal
Habitat
Cold, clear, well-oxygenated streams and rivers with gravel, cobble, and rocky riffles; commonly under stones, in crevices, and along stream margins in fast to moderate current.
Bait notes
Rarely targeted as a game fish. Small bits of worm, insect larvae, freshwater shrimp, or tiny soft plastics drifted low can tempt one when fishing trout streams; tiny jigs fished near bottom also work.
Behavior
A cryptic benthic ambush forager that stays near cover and darts short distances to seize insect larvae, small crustaceans, and fish eggs; most active at dusk, night, and during higher flows.
Caution
No major consumption concern is typical, but it is a small bycatch species and not usually kept. Check local regulations before retaining any fish from trout streams; avoid excessive handling because it is delicate.
Fishing notes
Fish tight to bottom in riffles, runs, and undercut edges with a very light presentation; use split shot or small jigs and let the offering rest near rocks. Handle gently and release quickly if caught incidentally.