Weever Fish

By Alex Clayton · Updated 23 October 2026

The weever fish is a small venomous fish, usually the lesser weever (Echiichthys vipera), that grows to about 15 cm and buries itself in clean sand in shallow water. Its venom sits in spines on the first dorsal fin and the gill covers, according to MarLIN.

Stings are seasonal. A University of Plymouth study of lifeguarded beaches in south-west England found 89% of recorded stings happened in June, July and August.

The treatment is heat, not ice. This guide to one of the least welcome sea fish species covers identification, where and when to expect weevers, NHS first aid for a weever fish sting, and safe unhooking.

Lesser Weever vs Greater Weever

Two weevers turn up in British waters, and the bigger one is rarely the fish that stings paddlers. The lesser weever (Echiichthys vipera) is the beach species. The greater weever (Trachinus draco) is larger and lives deeper, so boat anglers meet it far more often than bathers do.

Feature	Lesser weever	Greater weever
Typical size	Up to about 15 cm	Noticeably larger
Depth	Low water mark to about 50 m	1 to 150 m, usually 1 to 30 m
Seabed	Clean sand	Sand, mud and gravel
Who meets it	Paddlers, bathers, beach anglers	Mostly boat anglers, occasionally shore
Venom	Spines on first dorsal fin and gill covers	Spines on first dorsal fin and gill covers

Sources: MarLIN and FishBase.

On the British Record (rod-caught) Fish Committee list of June 2026, the greater weever boat record is 2lb 2oz 7dr (0.976 kg) from Porthcurno, Cornwall, in 1999, and the shore record is 1lb 9oz 6dr (0.722 kg) from Porthtowan, Cornwall, in 2014. The lesser weever sits on the mini-species list at 95.67 g (2001, Shambles Bank off Weymouth). Records change, so check the current list on the Angling Trust site.

On a sandy beach in summer, assume any weever you meet is a lesser weever.

How to Identify a Weever Fish

Check the dorsal fin before your hand goes anywhere near a small sandy fish. The Wildlife Trusts and MarLIN give these features:

A black first dorsal fin
An upturned mouth
Eyes set high on top of the head
Spines on the gill covers
A sandy, mottled body built for burying

Weevers lie buried in sand with only the head, back and dark dorsal fin showing, and MarLIN says they are probably most active at night. Stings are defensive. People get stung by treading on one or picking one up.

Our fish identification guide covers other small beach fish. The working rule: if a small fish from a sandy beach has a black first dorsal fin, treat it as a weever and do not handle it.

Where and When Weevers Are Found in the UK

Weever stings follow a pattern you can plan around. MarLIN records the lesser weever on clean sandy shores from the low water mark down, all round Britain but most often in the south and west. The Wildlife Trusts say they are best seen from June to October.

The most detailed sting data comes from a University of Plymouth study, published on 10 October 2024 in Estuarine, Coastal and Shelf Science. It used sting records from 77 RNLI-lifeguarded beaches between Burnham-on-Sea and Exmouth, April to November 2018, and reported two separate findings:

89% of stings happened in June, July and August.
Stings happened most often around low tide.

The study covers south-west England only, so treat it as a strong guide rather than a UK-wide figure.

Warm weather, sand, shallow water and low tide together are the highest-risk combination.

Weever Fish Sting Treatment: NHS First Aid Steps

A weever sting hurts badly, and online advice disagrees on soak times and hospital visits. The NHS lists the main symptoms as intense pain where you are stung and an itchy rash. Its first aid advice for sea creature stings (last reviewed 19 June 2024) sets out these steps:

Get help from a lifeguard or someone with first aid training if you can, and get local medical advice as soon as possible.
Rinse the area with seawater, not fresh water.
Remove any spines with tweezers or the edge of a bank card. Never use bare hands.
Soak the area in very warm water, as hot as can be tolerated, for at least 30 minutes. If you cannot soak it, use hot flannels or towels.
Take painkillers such as paracetamol or ibuprofen.

The NHS does not give a water temperature, so neither do we. Test the water on your own skin first, and take extra care with children or anyone who cannot judge heat well.

The Wildlife Trusts say the pain should ease after about 15 minutes, and some lifeguard advice reported in the press uses a shorter soak. On a lifeguarded beach, follow the lifeguard. Everywhere else, follow the NHS minimum of 30 minutes.

Keep the weever sting in hot water for the full 30 minutes, even if the pain fades sooner.

What Not to Do and When to Get Medical Help

Two popular remedies, urine and ice, are on the NHS list of don’ts:

Do not pee on the sting
Do not apply ice or a cold pack
Do not touch spines with bare hands
Do not cover or close the wound

Go to a minor injuries unit if severe pain is not going away, or if the sting is on the mouth or throat or near the eyes.

Call 999 or go to A&E for difficulty breathing, chest pain, fits or seizures, severe swelling around the sting, severe bleeding, vomiting, lightheadedness or loss of consciousness. The NHS says do not drive yourself to A&E.

Any of those symptoms means professional help, not more hot water.

How to Avoid Weever Stings on the Beach

Most of the NHS prevention advice is about your feet:

Look out for beach warning signs
Wear waterproof shoes or sandals in shallow water
Scuff or stamp your feet as you walk in the shallows
Leave sea creatures that sting alone

Thin soles may not stop a spine, so firm-soled wetsuit boots suit wading anglers better than flimsy beach shoes. On lifeguarded beaches, RNLI lifeguards are trained to treat weever stings, Countryfile reports. Take most care around low tide in summer, as the Plymouth findings above show.

In summer shallows, wear firm-soled boots and shuffle your feet.

Catching Weevers: Safe Unhooking for Anglers

Once a weever is on the end of your line, the risk moves from your feet to your hands. Lesser weevers are reported to take mackerel feathers, daylights and small baits such as ragworm, prawn and mackerel strip from sandy beaches in summer, often while you are after bass, cod or pollack. A safe routine:

Do not swing the fish to hand. Lower it onto the sand or an unhooking mat.
Confirm the black dorsal fin before you touch anything.
Use long-nosed pliers or a disgorger, ideally with heavy-duty gloves. Thin gloves may not stop a spine.
If the hook is deep, cut the line close to the mouth rather than handling the fish.
Return it to the water.

Treat a dead weever with the same care as a live one. Pliers keep the spines at arm’s length; fingers risk a 30-minute soak and a ruined session.

Frequently asked questions

Can a weever fish sting kill you?

A weever sting is very painful, but serious harm is rare. The NHS says call 999 or go to A&E for difficulty breathing, chest pain, fits, severe swelling or bleeding, vomiting, lightheadedness or loss of consciousness.

Should you pee on a weever sting?

No. The NHS says do not pee on a sting. Rinse it with seawater, remove any spines with tweezers or a bank card, then soak it in very warm water for at least 30 minutes.

How hot should the water be for a weever sting?

The NHS gives no number. It says as hot as can be tolerated, for at least 30 minutes. Test the water on your own skin first and take extra care with children.

How long does weever sting pain last?

Pain is reported to ease over a few hours and often goes within 12 to 24 hours. Some people report irritation for longer, and spines left in the wound prolong the pain. If severe pain does not go away, the NHS says go to a minor injuries unit.

What time of year are weevers most common?

Summer. In the University of Plymouth study of south-west England beaches, 89% of stings happened in June, July and August. The Wildlife Trusts say lesser weevers are best seen from June to October.