Brown trout are brown to gold on their back with a cream to slate-colored belly. Most fish have black, gray, yellow, and occasionally red spots all surrounded by a white halo. These are the only trout with both red and black spotting. The tail fin is usually unspotted or vaguely spotted. Young browns have a orange or reddish adipose fin. This species has a prominent spotted adipose fin between the dorsal and caudal fin. Adult size: 6 to 30 inches.