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Rainbow Trout

Rainbow Trout ©Alex Mustard/2020VISION

Rainbow trout

With a silvery body, and purple, pink and bluish streaks down its flanks, the rainbow trout lives up to its name. Popular with anglers, it is actually an introduced species in the UK.

Scientific name

Oncorhynchus mykiss

When to see

January to December

Species information

Statistics

Length: 50-70cm
Weight: up to 14kg
Average Lifespan: 4-6 years
Introduced species.

About

A large fish, the rainbow trout was introduced into UK fish farms from North America in the early 20th century; it has now become established in rivers and lakes throughout the country. It can live in poorer quality water than our native brown trout or Atlantic salmon. A predatory fish, it feeds on insect larvae, small fish and flying insects, such as mayflies and damselflies.

How to identify

A silvery-brown, dark-spotted fish, the rainbow trout can be distinguished from the similar brown trout by the broad, purple stripe that runs along its flanks.

Distribution

Widespread.

Did you know?

The rainbow trout has been introduced to every continent except Antarctica. As well as a freshwater race, there is also a migratory race - the Steelhead - which lives at sea and moves up-river to spawn.