The brown trout is a sleek, muscular freshwater fish with a classic torpedo-shaped body built for fast currents and long swims. Its coloration is beautifully variable but typically olive-brown to golden on the back, fading to a creamy yellow belly. Along its flanks are distinctive dark spots, often mixed with vivid red or orange spots surrounded by pale halos — a key visual hallmark of the species.

The head is slightly flattened with a wide mouth that extends past the eye, lined with small sharp teeth suited for a predatory diet. The fins are generally amber to light brown, sometimes with a faint orange tint, and the tail is broad and powerful.

Brown trout are masters of camouflage. Their mottled pattern blends perfectly with gravel beds, weed, and dappled river light, making them difficult to spot in the wild.

They inhabit clear, well-oxygenated rivers, streams, and lakes across Europe and have been introduced worldwide. In rivers, they tend to be slimmer and more brightly marked; in lakes, they grow larger, deeper-bodied, and more silvered.

An adaptable predator, they feed on insects, crustaceans, and smaller fish, and larger specimens become formidable hunters.

Typical size: 20–60 cm, though lake and migratory (sea trout) forms can grow much larger.
Lifespan: Up to 20 years in ideal conditions.

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