Color ranges from olive, blue-gray or black on the back to white on the belly. Belly and lower fins brilliant orange in spawning males. Upper body and dorsal fin have mottled or worm-like markings. Red spots, with or without bluish rings around them. The most distinguishing marks are the white and then black strip along the fore edge of the lower fins. Tail square or slightly forked. Occurs in about 278 mountain streams in Nevada where it frequents cooler water. Found in Ruby Mountain alpine lakes and other coldwater lakes.