Interactive River

River

Brown trout

Salmo trutta

A golden-brown fish covered in black and red spots, holding its place against the current.

Size
Usually 20 to 40cm long
Look for it
All year round
Where
Clean, cool rivers, streams and lakes

My spotter's list

Swims after you with a steady beat of its tail. Move your pointer and see.

When to look

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Brown trout

Good to know

Six things about the brown trout

Spots

Its own pattern

Every brown trout has a different pattern of spots, like a fingerprint.

Sea

Sea trout

Some brown trout swim out to sea and come back much bigger and silvery. They are called sea trout, but are the same species.

Current

Facing upstream

A trout faces into the current and waits for the river to bring food to it.

Eggs

A nest in the gravel

In winter the female digs a hollow in clean gravel with her tail and lays her eggs in it. The nest is called a redd.

Food

Rising for flies

Trout eat insects, shrimps and small fish. A ring on the surface often means a trout has just taken a fly.

Water

A sign of clean water

Trout need cool water with plenty of oxygen, so finding them is a good sign for a river.

The real thing

Photos of the brown trout

Brown trout, photo 1
Photo: Karelj, CC0, Wikimedia Commons
Brown trout, photo 2
Photo: böhringer friedrich, CC BY-SA 2.5, Wikimedia Commons
Brown trout, photo 3
Photo: Pe-Jo, CC BY-SA 3.0, Wikimedia Commons
Out and about

How to spot one

Stand on a bridge on a bright day, wearing sunglasses if you have them, and look for a shape holding steady behind a stone, facing upstream.

Lend a hand

How to help

Never pour anything down outside drains, and keep out of gravel shallows in winter, where the eggs are buried.

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