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The trout (Salmo fario) is a freshwater fish of the family Samonidae, native to the rivers that flow into the north-east Atlantic, the Mediterranean, Caspian and Black seas.
The trout has a rather short and compressed body, a small well-shaped head with a blunt conical snout, and is clothed with rounded scales marked with concentric lines of growth. The colour of the upper parts varies, but is often greenish brown, paling below to a dirty white. The dorsal fin is nearly central, and as in the salmon there is a small appendage (adipose fin) of fatty tissue between the dorsal and tail fins.
On the lower side there is a pair of pectoral or breast fins just behind the gill covers, a ventral fin below the hinder edge of the dorsal and the anal fin is below the adipose. The head and sides, as well as the back and tail fins are dotted with round or X-shaped black spots.
Trout live in running, clear streams or in the lakes from which such streams originate. Like salmon they seek the shallow upper waters for spawning and travel to these spawning grounds in autumn leaping out of the water to pass weirs and small waterfalls. During spawning the trout becomes a black colour and shiny, returning to its normal colour in late spring.
Trout feed on crustaceans, insects, snails, worms, the eggs of salmon and other fishes; and small fish.
 Research Trout
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