Species Finder Species Posted Mar 13, 2000 Brook Trout Appearance Their backs range from green to dark brown or nearly black in color. The sides are of a lighter color with pale spots and small red spots surrounded by bluish circles. The belly color often depends on the sex of the fish, as females can be white to yellow while males tend to have a deep orange or reddish tinge. Colors change dramatically as spawning time approaches. Ocean-going brook trout become silvery and actually lose some of their distinctive colors, although the red spots remain. Brook trout revert to their original colors when coming back into freshwater. Maximum Size Brook trout do not grow as large as other forms of trout, rarely exceeding 7 pounds (3 kg). The largest ever caught remains the oldest angling record in the world: a 14 pound 8 oz (6.57 kg) specimen caught back in 1916. 30-35 inches (76-89 cm) is the max length a brook trout could grow to. Geographic Range Brook trout are native to eastern North America, ranging as far north as Hudson Bay, south through higher elevations along the Appalachian Mountains to Georgia, and in the Mississippi River.It is Atlantic Canada's most common trout. Habitat Brook trouts are mainly a freshwater species that live in small streams, ponds, creeks, and lakes. There are also sea-running trout, spending upwards of three months in the ocean, but never straying too far from shore. Life Span 5-8 years. Food Plankton, insects, snails, clams, and fish. Sea run brook trout eat fish almost exclusively while in salt water. Spawning Brook trout spawn in the fall from September to November, usually in streams on gravel. Hatchlings emerge from the gravel the following spring, barely longer than an inch (3 cm). Predators Larger fish (northern pike), birds (ospreys, kingfisher, herons, and loons) and mammals (otters, raccoons, and mink). Information credit: Fisheries and Oceans Canada.