Atlantic Salmon

By Alex Clayton · Updated 23 October 2026

In 2025, anglers in England and Wales declared a rod catch of just 4,053 salmon, the lowest since 1988, and 98% of those fish went back. The Atlantic salmon (Salmo salar) is a migratory game fish that hatches in UK rivers, feeds at sea and returns to its home river to spawn. In Great Britain it is now classed as Endangered on the IUCN Red List.

That changes what salmon fishing in the UK means. On most rivers it is now catch and release for at least part of the season, and the rules differ between England, Wales, Scotland and Northern Ireland.

This guide covers how to tell a salmon from a sea trout, the life cycle terms anglers use (parr, smolt, grilse), where and when salmon run, their conservation status, the rules nation by nation, fishing methods, careful handling and the heaviest salmon recognised in Britain.

How to Identify an Atlantic Salmon

A fresh sea trout and a small salmon can look almost identical on the bank. Mix them up and your catch return is wrong, and catch returns feed the stock assessments for every river.

Adult Atlantic salmon grow to 1.2 to 1.5 metres and can reach around 88 lb (40 kg). A fresh-run fish has a dark back, bright silver flanks and spots mostly above the lateral line. Near spawning, mature cock fish grow a hooked lower jaw called a kype, and fish that have been in the river for weeks colour up and darken.

Four checks separate the lookalikes:

Feature	Salmon	Sea trout	Brown trout
Tail	Slim wrist you can grip; tail slightly forked	Thicker wrist; tail square or nearly so	Thick wrist; square tail
Jaw	Upper jaw ends around the back of the eye	Upper jaw extends behind the eye	Upper jaw extends behind the eye
Spotting	Few spots, mostly above the lateral line	More spots, often below the lateral line too	Heavy spotting, often red spots
Where found	Migrates to sea	Migrates to sea	Stays in fresh water

Salmon parr carry dark parr marks and have a smaller mouth than brown trout of the same size. Treat any small fish you are unsure of as protected and return it at once.

If in doubt, photograph the fish in the water and check it against our guide to telling sea trout from salmon before you record it. The sea trout, brown trout and fish identification guides cover the wider picture.

The Salmon Life Cycle: Parr, Smolt, Grilse and Multi-Sea-Winter Fish

A salmon spends years in a river, years at sea, and then finds its way back to the stream where it hatched. Each stage of that journey has a name, and those names turn up in every river report and rod catch summary.

Spawning. Adults move up to gravel headwaters, roughly from November to February. The hen fish cuts a nest in the gravel, called a redd, and lays her eggs.
Alevin and fry. Eggs hatch into alevins, which live off their yolk sac before emerging as fry.
Parr. Young salmon stay in the river as parr for one to four or five years, depending on water temperature and food.
Smolt. The parr turns silver and migrates to sea.
Sea phase and return. Some fish come back after a single winter at sea. Others stay for two winters or more and return much heavier.

Those sea-age classes matter to anglers, because they shape both the size and the timing of the fish you meet.

Term	Meaning
Parr	Juvenile salmon living in the river
Smolt	Silvered juvenile migrating to sea
Grilse	Adult returning after one winter at sea
MSW (multi-sea-winter)	Adult returning after two or more winters at sea; generally the bigger fish
Kelt	Spawned-out adult; return it to the water

The sea-age of an Atlantic salmon largely decides when it runs, which is where the next section picks up.

Where Atlantic Salmon Live in the UK, and When They Run

A line saying “the season runs February to October” is no use when your river closes on a different date and your fish arrive in a different month.

UK salmon rivers are found throughout Scotland, Wales and Northern Ireland, and across northern and south-western England. A few examples show the spread:

Scotland: the Tay, where the heaviest recognised British rod-caught salmon was landed.
Wales and the borders: the Wye, Usk and Severn, each covered by Natural Resources Wales byelaws in Wales.
England: the Eden in Cumbria, plus the Cumbrian Calder, Dorset Stour and Yealm, which the Environment Agency lists as At Risk rivers.

Spring salmon, known as springers, enter rivers early in the year and are often multi-sea-winter fish. Grilse tend to arrive through the summer, and autumn brings another push of fish on many rivers. Treat this as a rough pattern only, because timing varies from river to river and year to year.

Access is the other half of the picture. Most salmon fishing in the UK is controlled by estates, angling associations and hotels that let beats, so your permission comes from the beat owner or association, not from a licence alone. For related species, see our guide to other UK game fish.

Before you book a trip, read the river’s own catch reports and speak to the beat or association.

Is the Atlantic Salmon Endangered in the UK?

In 2024, 84% of England’s principal salmon rivers were assessed as at risk. Add the rivers rated probably at risk and the figure rises to 90%, according to the assessment the Environment Agency and Cefas published in October 2024.

In Great Britain, yes. In December 2023 the IUCN Red List assessment for Great Britain moved the Atlantic salmon from Least Concern to Endangered. Globally, the species is listed as Near Threatened.

Rod catches point the same way:

The 2025 declared rod catch for England and Wales was 4,053 salmon, the lowest since 1988.
That was down 33% on 2024. The 2023 catch was 4,911.
3,977 of the 2025 fish, or 98%, were released.

The IUCN assessment names several pressures acting together:

Climate change
Poor water quality
Dams and other barriers to migration
Salmon farming
Exploitation at sea
Invasive species

The Atlantic salmon is also a priority species under the UK post-2010 Biodiversity Framework.

Anglers have a direct part to play. The catch returns you submit feed these assessments, so an accurate return is one of the most useful things you can do for the species.

This decline is behind the catch and release rules now in force across much of the UK, and those rules differ from nation to nation.

Salmon Fishing Rules in England, Wales, Scotland and Northern Ireland

This table answers the three questions that matter before you fish for salmon anywhere in the UK: do you need a licence, can you keep a fish, and when can you fish.

Nation	Licence	Catch and release	Season and who to check
England	Environment Agency salmon and sea trout rod licence (GOV.UK, 23 October 2026: 1 day £13.50, 8 days £30.50, 12 months £93.10, or £62.00 if 66 or over or disabled; free for ages 13 to 16)	National byelaw since 1 January 2019: all salmon released, fly or lure only, before 16 June. Mandatory release all season on At Risk rivers (Cumbrian Calder, Dorset Stour, Yealm) and listed Recovering Rivers. Sale of rod-caught salmon is prohibited	Close seasons set by EA area; check the local byelaw
Wales	The same salmon and sea trout rod licence covers England and Wales	Wye: all salmon and sea trout released. Usk: all salmon released. Both from 1 March 2022 to 31 December 2029. Severn in Wales: all salmon and sea trout released, no bait, barbless hooks, from 1 March 2022 for 10 years	Set by river byelaw; check Natural Resources Wales
Scotland	England and Wales licence does not cover most of Scotland; get permission from the fishery owner	Rivers graded annually 1, 2 or 3 (Good, Moderate, Poor). Grade 3 Poor means mandatory catch and release under the Conservation of Salmon (Scotland) Regulations 2016, as amended	Set by district; check gov.scot gradings and the district salmon fishery board
Northern Ireland	England and Wales licence does not cover most of Northern Ireland; separate permissions apply	Catch and release of salmon and sea trout is required by law in DAERA waters, apart from listed exceptions. The Loughs Agency area has its own rules	Check DAERA, or the Loughs Agency in the Foyle and Carlingford areas

Seasons and catch returns

England’s close seasons vary by Environment Agency area. The EA’s 2023 notice gave Yorkshire’s salmon close season as 1 November to 5 April and the Southern area’s as 3 October to 16 January, so check the current local byelaw before you fish. Byelaw offences can carry fines of up to £50,000. See close seasons explained.

Scottish, Welsh and Northern Irish season dates are left out on purpose: each district or river sets its own. The proposed 2026 Scottish gradings placed 115 of 173 stocks in the Poor category; check the final river gradings on gov.scot for your river.

The EA asks salmon anglers to submit catch returns. Licence prices change, so confirm them on GOV.UK before you buy; our rod licence guide explains what each licence covers.

Across all four nations, the safe working rule is to plan on releasing every salmon you catch.

How Salmon Are Fished: Fly, Spinning and Bait

Your choice of method is often made for you. Before 16 June in England it is fly or lure only, and on the Severn in Wales bait fishing for salmon is banned outright.

Fly fishing is the traditional method on most beats. Double-handed rods are common on bigger rivers, with single-handed rods on smaller water. Our fly fishing guide covers the basics.
Spinning with lures such as spoons and spinners is allowed under England’s early-season rule, which permits fly or lure.
Bait fishing with worm, prawn or shrimp is the most restricted method. It is banned for salmon on the Welsh Severn and excluded in England before 16 June.

Beats often add their own method rules on top of the byelaws, so ask before you set up.

Barbless or debarbed hooks are mandatory on the Welsh Severn and good practice anywhere you expect to release fish.

If you are new to salmon, start with fly or a lure where the beat allows both. Skip bait unless both the beat and the byelaw clearly permit it.

Handling and Releasing a Salmon

Four habits make most of the difference to a released salmon’s survival, and none of them needs special tackle. They come from Environment Agency and Angling Trust guidance:

Use barbless or debarbed hooks. They are mandatory on some rivers, including the Welsh Severn.
Keep the fish in the water. If you want a photo, keep it out for no more than a few seconds.
Wet your hands before you touch the fish.
Unhook and release quickly, with as little handling as possible.

The EA and Angling Trust are aiming for a release rate above 90%, and 100% on the most threatened rivers. See our guide to catch and release for handling advice on all species.

If you only change one thing, keep the fish wet and in the water.

How Big Do Salmon Get? The Biggest Salmon in the UK

The heaviest rod-caught salmon recognised in Britain was landed more than a century ago, by a woman fishing the Tay.

That fish weighed 64 lb (29 kg). Georgina Ballantine landed it on the River Tay on 7 October 1922, and it is generally recognised as the largest rod-caught British salmon. Across its range, the species can reach around 88 lb (40 kg).

Most fish anglers meet are much smaller. As covered in the life cycle section above, grilse are lighter than multi-sea-winter fish, so the biggest salmon in the UK are usually fish that spent two or more winters at sea.

Today, a big salmon is a photograph in the water rather than a weight on the scales, because nearly all are released.

Frequently asked questions

Is Atlantic salmon endangered in the UK?

Yes, in Great Britain. The IUCN Red List assessment for Great Britain moved the Atlantic salmon to Endangered in December 2023, while its global status is Near Threatened. In England, 90% of principal salmon rivers were assessed as at risk or probably at risk in 2024.

Do you need a licence to fish for salmon?

In England and Wales you need a salmon and sea trout rod licence, plus permission from whoever controls the water. That licence does not cover most of Scotland or Northern Ireland, where different permissions apply. Prices change, so confirm on GOV.UK before buying. Our rod licence guide explains the options.

Can you keep a salmon you catch in the UK?

Often not. Release is required in England before 16 June and all season on At Risk rivers, on the Wye, Usk and Welsh Severn, on Scottish rivers graded Poor, and in most DAERA waters in Northern Ireland. Selling rod-caught salmon is prohibited in England. Always check the river's own rules.

When is the salmon fishing season?

It depends on the river. England's close seasons vary by Environment Agency area, while Scottish, Welsh and Northern Irish seasons are set by district or river byelaw. Check with the EA, Natural Resources Wales, gov.scot or your district salmon fishery board, or DAERA. See close seasons explained.