Brook Trout are spectacular with their distinct coloring. With olive, blue-gray or black on the back to white on the belly. Their upper body and dorsal fin have dark mottled or worm-like markings called vermiculations and red spots, with or without bluish rings or halos around them throughout their sides. The most distinguishing marks are the white and thin black stripe along the fore edge of the lower fins. The belly and lower fins are brilliant orange in spawning males.