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FISH GUIDE · Freshwater

Rainbow trout: identification, habitat and fishing guide

Oncorhynchus mykiss

A salmonid native to the North American Pacific coast.

Catalogue names : Rainbow trout. Forms and names may vary between habitats.

Editorial review : · This species guide is not permission to fish. Read the precautions below and check the current rules for your location before targeting a species. Some species or populations are protected.

Geographical distribution

Native to North Pacific drainages, notably western North America and Kamchatka. Widely introduced elsewhere, including France. Presence resulting from stocking does not establish a self-sustaining breeding population.

  • Native range : Western North America
  • Native range : Kamchatka
  • Introduction : France

Documented areas, not an exhaustive list. Presence in a region does not imply presence in every water body or permission to fish.

Distribution sources

Identification

Oncorhynchus mykiss has an adipose fin and usually a pinkish band along its sides, with dark spots extending onto the tail. Its colour varies with habitat and maturity. Compare several features to avoid confusing it with brown trout; no single pattern is absolute proof.

Habitat

Habitats similar to those of brown trout.

Diet

Insects, crustaceans, molluscs and fish.

Behaviour

The species’ biology is well documented in aquaculture, but a rearing tank does not reproduce river conditions. Individuals and their experience vary. A recently stocked fish is not automatically easy to catch; observe its movements and its response to presentations.

Indicative biological size

20–50 cm in the federation guide; varies with habitat.

Fishing context and precautions

  1. In a river, choose an accessible drift. Check that bait fishing is permitted on the stretch, then prepare a line with a single hook and adjustable shotting.
  2. Present the bait upstream of the chosen area and follow the line to keep it moving low in the water without constant snagging.
  3. Check tension, path and bait condition after each difficult pass. Adjust the shotting gradually rather than immediately changing bait.
  4. In still water, prefer a float with the depth plumbed and compare several depths. This other method needs its own adjustments; river drift fishing is not a universal recipe.

A distinctive feature

Its gills help regulate its salt balance, allowing it to adapt to salt water.

Sources and review

Each reference includes its access date. Overall editorial review: . Local conditions and regulations may change.

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