The trout is a fish of medium size, with a length of about 70 cm and a weight of one kilogram. The maximum recorded length is 140 cm and the maximum weight of 50 kilos. They can live up to 38 years. They have a thin body, sometimes with oval profile, depending on the environment in which they live. Their scales are small. They have two dorsal fins, a fatty relatively small situated far behind. The caudal fin is bilobed, with the rear edge sometimes straight and sometimes the lobes are almost symmetrical and stressed. Their color varies depending on environmental conditions. Generally have blue-gray or brown back and open shiny silver side, sometimes tend to golden or reddish. They have black spots on the back and red-orange on the side, which are surrounded by a faint halo. The spots are more pronounced in trout that live in deep waters. The mouth is large and extends behind the eyes.
