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Legendary Species · Trøndelag

Sea trout in Trøndelag

Salmo trutta trutta[1]

8 Trøndelag waters whose agency species list names sea trout. Each links to its water page (gauge, regulations, access map, guides and shops) and to the agency list it comes from.

  • 8waters list it
  • 1destination hub
A nineteenth-century colour plate of two silvery sea trout with scattered dark spots, hills behind them
Sea trout (Salmo trutta trutta), 1879 colour plate credited to Houghton and Lydon. Artwork: Houghton / Lyndon, public domain, via Wikimedia Commons

Trøndelag waters

Most fished first. A species missing from an agency list does not mean it is absent; this page lists only waters whose list names it (at least 5 are needed for a page).

All Trøndelag watersSea trout: every state

Identification

  • Sea trout are the same species as brown trout. As young fish in rivers they cannot be told apart from brown trout, and the two interbreed where both occur.[1]
    What the source says
    “As juvenile trout in rivers where they grow as parr, sea trout are indistinguishable from brown trout, and these two ecotypes of trout interbreed in rivers where both are present.”
  • To tell a sea trout from a salmon, look at the upper jaw: in a sea trout it extends past the rear of the eye; in a salmon it does not.[2]
    What the source says
    “Salmon (left): Upper jaw does not extend further than the rear of the eye. Sea trout (right): Upper jaw extends further than the rear of the eye.”
  • Sea trout often have many black spots extending below the lateral line.[2]
    What the source says
    “Often has a lot of black spots extending below the lateral line”

More on identifying sea trout

Status, protections and rules

As each agency stated them on the date read; a rule applies only where its agency says so. Check the current regulations for the water before you fish.

  • Inland Fisheries Ireland says sea trout stocks have collapsed in recent years, with concern about sea-lice infestations, and encourages anglers to practise catch-and-release.[1]
    What the source says
    “Stocks of sea trout have collapsed in recent years, however, and there are concerns about the impacts of sea-lice infestations. Anglers are encouraged to practice catch-and-release to help conserve sea trout.”
  • NatureScot notes that both brown trout and sea trout are UK Biodiversity Action Plan priority fish species.[3]
    What the source says
    “But both brown trout and sea trout are UK Biodiversity Action Plan priority fish species.”
  • Natural Resources Wales rule: on all Welsh rivers, every sea trout over 60 cm must be released with minimum injury and delay.[4]
    What the source says
    “On all rivers, all sea trout greater than 60cm must be released with minimum injury and delay.”
  • GOV.UK: you can be fined for selling rod-caught salmon or sea trout in England and Wales.[5]
    What the source says
    “You can be fined for selling rod-caught salmon or sea trout in England and Wales.”

Destination hubs

Hubs that list one of these waters, or that a water page is near: each has guides, shops, licences and trip planning for the area.

Sources

Every fact on this page is our paraphrase of the page cited beside it, read on the date shown. Rules and seasons change: check the agency's current regulations before you fish.

  1. Sea trout (Salmo trutta trutta) | Inland Fisheries Ireland Inland Fisheries Ireland, read Oct 24, 2026.
  2. DiadSea Booklet: An identification guide to migratory diadromous fish at sea (PDF) Inland Fisheries Ireland, read Oct 24, 2026.
  3. Brown trout | NatureScot NatureScot, read Oct 24, 2026.
  4. Natural Resources Wales / Sea trout open seasons and method restrictions Natural Resources Wales, read Oct 24, 2026.
  5. Freshwater rod fishing rules (printable guide) - GOV.UK GOV.UK (Environment Agency guidance), read Oct 24, 2026.