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It is a very hardy trout that competes well with other fish and endures marginal water qualities better than most trouts. It generally has golden brown hues with yellow under parts. The males during spawning are often brilliantly splashed with crimson spots circled with blue halos. Its upper body is usually profusely dappled with large, irregular, dark chocolate spots. It is carnivorous and sports a stronger, sharper set of teeth than most trout. Brown trout often grow to considerable size.
Brown trout may live for several years although, as with the Atlantic salmon, there is a high proportion of death of males after spawning and probably fewer than 20% of female kelts recover from spawning. The migratory forms grow to significantly larger sizes and may live longer.
Habitat and Range
Brown Trout migrate from lakes into rivers or streams to spawn, although there is some evidence of stocks that spawn on wind-swept shorelines of lakes. S. trutta morpha fario form stream-resident populations, typically in alpine streams but sometimes in larger rivers.