Mottled Sculpin (Cottus bairdii)

Description: 

The Mottled Sculpin is a species complex with unrecognized diversity distributed patchily in both Western and Eastern North America in Arctic, Atlantic, Gulf, and Pacific drainages. They are found in a variety of habitats but need cool water and swift currents. Like all sculpins, they are ambush predators that use their cryptic coloration to hide on stream bottoms and eat anything that fits into their extremely large mouth.