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Lesser weever

Fish · Last reviewed 2026-08-17

A fish the length of a finger that buries itself in warm shallow sand with a venomous black dorsal fin showing, and puts more people into British emergency departments each summer than every other marine animal here combined.

Safety

Venomous and spined species — Can cause serious injury or death

Five to seven grooved venom spines in a jet-black first dorsal fin, plus a spine on each gill cover. The fish lies buried in shallow sand and is stood on, or is picked up out of a net or bait tray. The result is immediate severe burning pain, frequently lasting many hours, with marked swelling of the foot or hand. Serious systemic reactions are rare and do occur, and spines can break off in the wound.

What reduces it: Shuffle rather than stride in shallow sandy water; wear beach shoes or boots, accepting that thin ones can be penetrated. Never pick up a small sandy fish with a black dorsal fin, alive or dead. Unhook with long forceps with the fish on the ground, or cut the trace. If stung, immerse in water as hot as can be tolerated without scalding for thirty to ninety minutes, and seek medical help for anything beyond local pain, for children, or if a spine may be retained.

Worse when:

  • Warm summer days around low water on gently shelving sandy beaches
  • Bare feet, and thin wetsuit boots which spines can penetrate
  • Bait trays, shrimp nets and landing nets, where a dead weever is as dangerous as a live one

FishingHQ already held the greater weever and described weever envenomation on it. That was the wrong fish for the job. The greater weever lives in deeper water and reaches people on a hook; the stings that ruin British beach holidays come almost entirely from this species, which lies buried in a few inches of warm sand where children are standing.

IT IS SMALL, AND THAT IS THE PROBLEM. A lesser weever is usually under twelve centimetres. It has upward-facing eyes, an oblique upturned mouth, and it wriggles backwards into clean sand until only the eyes and the first dorsal fin are exposed. That first dorsal fin is jet black — a warning colour — and carries five to seven grooved spines with venom glands at their base. There is a further spine on each gill cover.

THE STING IS DISPROPORTIONATE TO THE ANIMAL. Severe, immediate, burning pain that builds over the first hour or two and can persist for many hours, often with swelling of the whole foot or hand. It is very rarely dangerous in itself; it is memorably horrible, and the standard first aid is hot water, because the venom is heat-labile.

AND ANGLERS GET IT FROM A DIFFERENT DIRECTION. Bathers are stung by standing on a buried fish. Anglers and bait diggers are stung by handling one that has come up in a net, on a hook or in a bait tray — often without recognising what they have picked up.

Identification

FishingHQ holds no photograph of this species whose identity and licensing it can vouch for, so it is not showing one. Misidentified fish photographs teach identification wrongly, and a picture with an unchecked caption would be worse than none. The identification points below are what to look at instead.

Scientific name
Echiichthys vipera
Family
Trachinidae
Water
Saltwater
Conservation status
Least Concern
Regions
Britain & Ireland, Western Europe, Northern Europe, Mediterranean, North Africa, West Africa
  • A JET-BLACK FIRST DORSAL FIN, short and triangular, carrying five to seven spines. On a small sandy-coloured fish this is unmistakable and it is a warning: those spines are the venom apparatus.
  • SMALL — usually under 12 cm and rarely over 15. The greater weever reaches 40 cm and lives deeper.
  • EYES ON TOP OF THE HEAD and a strongly oblique, upturned mouth: the anatomy of a fish that lies buried looking upwards.
  • A SPINE ON EACH GILL COVER, pointing backwards, which is the one people forget when they pick a fish up carefully by the head.
  • SANDY BROWN ABOVE AND PALE BELOW, with no obvious markings other than the black fin. It is designed to be invisible against clean sand and it succeeds.
  • THE GREATER WEEVER is longer, more elongate, has oblique dark bars on the flanks and yellow markings, and is a deeper-water fish. Both are venomous; only one of them is under your foot.

Size

Typical
8–12 cm.
Large
Over 14 cm is a large lesser weever.

Exceptional: Around 15 cm is the widely reported maximum for the species.

Lifecycle and reproduction

A short-lived small fish, maturing within two to three years and living perhaps five. Spawning occurs in summer with pelagic eggs and larvae; juveniles settle to clean sand at small size and live the rest of their lives associated with it. Numbers inshore are strongly seasonal, and the species is abundant on sandy ground around southern and western Britain and Ireland through summer. It is a fish nobody manages, nobody assesses and almost nobody sees alive, which is unusual for an animal with this much public impact.

Summer spawning over sandy ground, with eggs and larvae in the plankton. There is no nest, no care, and no migration. The relevant seasonal fact for a reader is not the spawning but the consequence: weevers are inshore in numbers exactly when people are in warm shallow water, and the coincidence of the two is the whole of the public-health story.

Feeding and senses

An ambush predator. Buried in sand with only the eyes and the black fin exposed, it waits for small shrimps, mysids, small fish and other invertebrates to pass overhead and takes them with a very fast upward strike. It does not hunt and it does not chase. This is why standing on one is the commonest way to meet it: the fish's entire strategy is to remain where it is and be invisible, and it will not move out of the way of a foot.

Vision, directed upward, is the hunting sense — eyes set on top of the head watching the water above a buried body. The lateral line detects the movement of prey close by. Neither is any use for detecting a person, and the fish does not treat a human as a predator to flee from; the sting is a defence used at contact rather than an attack.

Through the year

Inshore on shallow sand from late spring through to early autumn, and in deeper water over winter. The stings are therefore a summer phenomenon almost exclusively, concentrated on warm days around low water on gently shelving sandy beaches.

Distribution

Eastern Atlantic from the North Sea and southern Scandinavia to West Africa, and into the Mediterranean, on clean sand from the shallow subtidal down to around fifty metres. Abundant on sandy beaches around southern and western Britain and Ireland in summer.

This is a biological range — where the species occurs, not a prediction that you will catch one. To browse the fishing geography FishingHQ holds, start at fishing places.

Why anglers care

Not quarry in any sense. It appears in this catalogue for three reasons: it is caught constantly by accident on small baits over clean sand, it turns up alive in shrimp nets and bait trays, and it is the single most likely cause of an envenomation on a British beach. An angler who can recognise the black dorsal fin will not pick one up bare-handed, and a bait digger or shrimper who knows they are there will shuffle rather than stride.

Handling and returning

Do not handle a live lesser weever. If one comes up on a hook, cut the trace or unhook it with long forceps while it is on the ground, and never hold it — including by the head, because there is a spine on each gill cover. Spines can penetrate a wetsuit boot and a thin glove. A dead weever is still dangerous; the venom apparatus does not stop working because the fish has, and stings from fish in bait trays and landing nets are common. If a fish must be moved, move it with a tool.

What a weever sting does, and the first aid that is actually agreed

THE SYMPTOMS. Immediate, intense, burning pain out of all proportion to a puncture from a fish that could sit in your palm. Pain typically peaks within the first half-hour to two hours and can persist for many hours; the foot or hand commonly swells, sometimes considerably, and numbness, redness and itching may follow and can last for days. Spines occasionally break off in the wound.

THE FIRST AID IS HOT WATER, AND IT IS UNUSUALLY WELL AGREED. The venom is heat-labile, and immersing the affected part in water as hot as can be tolerated without scalding — commonly given as around 40–45°C — for thirty to ninety minutes, topping it up as it cools, gives substantial relief in most cases. This is the same principle used for other fish envenomations and it is one of the few first-aid measures in this catalogue with genuine consensus behind it.

CHECK FOR A RETAINED SPINE, and get the wound looked at if the pain does not settle, if swelling spreads, if there are signs of infection, or if the person is a child, elderly, or has any reaction beyond the local one. Marine puncture wounds become infected readily.

FISHINGHQ IS NOT YOUR DOCTOR. Serious reactions are rare and they exist, and anything beyond straightforward local pain — difficulty breathing, faintness, spreading swelling — is a reason to seek medical help immediately rather than to sit with a bowl of water. Local emergency medical services and poisons information services are the authority here, and this page is not a substitute for them.

WHAT PREVENTS IT. Beach shoes or wetsuit boots — though spines can penetrate thin ones. Shuffling rather than striding in shallow sandy water, which pushes a buried fish away instead of standing on it. And for anglers, the recognition that a small sandy fish with a black dorsal fin in the bottom of a net is not to be picked up.

Authoritative guidance

Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.

  • The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution, habitat, identification characters and biology of the fishes of the British Isles and north-west Europe.States this directlyCitation checked — the work exists and is described correctly
  • General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated descriptions of species behaviour and regional angling practice, recorded as consensus rather than as scholarship.Background and mechanism onlyCitation checked — the work exists and is described correctly
  • FAO Species Identification Guides for Fishery Purposes and the FAO Species Catalogues — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Diagnostic identification characters, family placement, depth range and distribution as set out in the FAO species identification sheets for the eastern Atlantic and Mediterranean.States this directlyCitation checked — the work exists and is described correctly

Why the catalogue had this on the wrong fish

FishingHQ described weever envenomation on the greater weever record, and the greater weever is not the fish doing it.

GREATER WEEVER — up to about 40 cm, elongate, barred and yellow-marked, and living from around ten metres down to over a hundred on sand and mud. Anglers and trawlers meet it. Bathers do not.

LESSER WEEVER — under 15 cm, unmarked except for the black fin, and buried in clean sand from the low water mark down to a few tens of metres. This is the animal that people stand on.

BOTH ARE VENOMOUS and the venom and first aid are effectively the same. The distinction is entirely about who encounters which, and it decides who the page is for: a boat angler unhooking a fish, or a parent at a beach in August.

HOW THIS WAS FOUND, AND WHY IT IS WORTH RECORDING. Not by anybody reading the greater weever page, which is accurate about the greater weever. It came out of a species-level checklist of British quarry written from outside the catalogue, which asked what a British-complete platform needs and answered 'the weever that stings people'. Documenting a hazard on the wrong member of a family is a failure no internal audit can see, because nothing internal knows the family has another member.

WHAT MAY BE DONE WITH THIS FISH IS NOT ON THIS PAGE. Size limits, retention, closed periods and protected status differ between administrations and are revised. Check the current position with the fisheries authority for the water you are fishing.

Practitioner consensus

Widely and independently recommended by experienced anglers and specialist sources. This is real angling knowledge, not proof: controlled evidence for it is limited, and FishingHQ records it as convention rather than as a demonstrated effect.

  • The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution, habitat, identification characters and biology of the fishes of the British Isles and north-west Europe.States this directlyCitation checked — the work exists and is described correctly
  • FAO Species Identification Guides for Fishery Purposes and the FAO Species Catalogues — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Diagnostic identification characters, family placement, depth range and distribution as set out in the FAO species identification sheets for the eastern Atlantic and Mediterranean.States this directlyCitation checked — the work exists and is described correctly
  • Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK sea angling practice as reported by practitioners: ground, seasonal timing, bait and method convention.States this directlyCitation checked — the work exists and is described correctly

Where to go next

Where it lives

What these connections rest on (2)

Scientific evidence — 2 connections

Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.

  • Mudflats and intertidal sandflats

    A distributional claim about where a species is found, resting on the standard regional reference works rather than on angling report.

    • The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution, habitat association, identification and biology of the fishes and inshore fauna of the British Isles and north-west Europe.States this directlyCitation checked — the work exists and is described correctly
    • FAO Species Identification Guides for Fishery Purposes and the FAO Species Catalogues — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Diagnostic characters, family placement, habitat and depth range as set out in the FAO species identification sheets for the eastern Atlantic and Mediterranean.States this directlyCitation checked — the work exists and is described correctly

  • Surf beaches

    A distributional claim about where a species is found, resting on the standard regional reference works rather than on angling report.

    • The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution, habitat association, identification and biology of the fishes and inshore fauna of the British Isles and north-west Europe.States this directlyCitation checked — the work exists and is described correctly
    • FAO Species Identification Guides for Fishery Purposes and the FAO Species Catalogues — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Diagnostic characters, family placement, habitat and depth range as set out in the FAO species identification sheets for the eastern Atlantic and Mediterranean.States this directlyCitation checked — the work exists and is described correctly

Where you will find it

What these connections rest on (1)

Scientific evidence — 1 connection

Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.

  • Cyprus

    A distribution edge resting on published regional identification and distribution references, written where the species is genuinely characteristic of the destination's fishing rather than merely recorded from its waters.

    • FAO Species Identification Guides for Fishery Purposes and the FAO Species Catalogues — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Distribution, habitat association and biology of the fishes of the eastern central Atlantic and the Mediterranean, from the regional identification guides prepared for fishery purposes.States this directlyCitation checked — the work exists and is described correctly
    • FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Recorded environment, depth range, distribution and biology of the species named.States this directlyPassage read and verified

Understanding this fish

What these connections rest on (1)

Scientific evidence — 1 connection

Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.

  • Amphipods and mysids as prey

    A diet claim recorded at group level, pointed at a modelled prey CATEGORY, because the reference works describe the diet as a group rather than by species. Naming a particular species the catalogue happens to hold would invent a precision the evidence never had.

    • The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution, habitat association, identification and biology of the fishes and inshore fauna of the British Isles and north-west Europe.States this directlyCitation checked — the work exists and is described correctly
    • FAO Species Identification Guides for Fishery Purposes and the FAO Species Catalogues — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Diagnostic characters, family placement, habitat and depth range as set out in the FAO species identification sheets for the eastern Atlantic and Mediterranean.States this directlyCitation checked — the work exists and is described correctly

Told apart from

What these connections rest on (3)

Scientific evidence — 1 connection

Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.

  • Greater weever

    Taxonomic and practical relatedness recorded because confusable species matter more to a reader than a shared family does, with the evidence naming the species the edge is about.

    • The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Identification characters, family placement and biology of Trachinus draco and of the species it is confused with, as set out for the fauna of the British Isles and north-west Europe.States this directlyCitation checked — the work exists and is described correctly
    • FAO Species Identification Guides for Fishery Purposes and the FAO Species Catalogues — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Diagnostic characters and family placement of Trachinus draco as set out in the FAO species identification sheets for the region concerned.States this directlyCitation checked — the work exists and is described correctly

Practitioner consensus — 3 connections

Widely and independently recommended by experienced anglers and specialist sources. This is real angling knowledge, not proof: controlled evidence for it is limited, and FishingHQ records it as convention rather than as a demonstrated effect.

  • Greater weever

    A comparison a reader with the animal or the decision in front of them actually needs, joining two records that resolve one another.

    • The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution, habitat association, identification and biology of the fishes and inshore fauna of the British Isles and north-west Europe.States this directlyCitation checked — the work exists and is described correctly
    • FAO Species Identification Guides for Fishery Purposes and the FAO Species Catalogues — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Diagnostic characters, family placement, habitat and depth range as set out in the FAO species identification sheets for the eastern Atlantic and Mediterranean.States this directlyCitation checked — the work exists and is described correctly

  • Long-spined sea scorpion

    A comparison a reader with the animal or the decision in front of them genuinely needs.

    • UK Diving Medical Committee guidance on medical standards for divers — UK Diving Medical Committee (Water-safety or diver-training authority)Relied on for: Medical guidance relevant to divers and water users, including the recognition and management of marine envenomation.States this directlyCitation checked — the work exists and is described correctly
    • FAO Species Identification Guides for Fishery Purposes and the FAO Species Catalogues — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Diagnostic characters and distribution of the venomous species concerned.States this directlyCitation checked — the work exists and is described correctly

  • Reef stonefish

    A comparison a reader with the animal or the decision in front of them genuinely needs.

    • UK Diving Medical Committee guidance on medical standards for divers — UK Diving Medical Committee (Water-safety or diver-training authority)Relied on for: Medical guidance relevant to divers and water users, including the recognition and management of marine envenomation.States this directlyCitation checked — the work exists and is described correctly
    • FAO Species Identification Guides for Fishery Purposes and the FAO Species Catalogues — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Diagnostic characters and distribution of the venomous species concerned.States this directlyCitation checked — the work exists and is described correctly

Safety reading

What these connections rest on (2)

Authoritative guidance — 2 connections

Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.

  • Handling fish safely

    A link to a safety topic substantial enough to be read in full.

    • RNLI water safety guidance: cold water shock and Float to Live — Royal National Lifeboat Institution (Water-safety or diver-training authority)Relied on for: Water safety guidance for coastal and inland users.States this directlyPassage read and verified

  • Venomous and spined fish

    A link to a safety topic substantial enough to be read in full.

    • RNLI water safety guidance: cold water shock and Float to Live — Royal National Lifeboat Institution (Water-safety or diver-training authority)Relied on for: Water safety guidance for coastal and inland users.States this directlyPassage read and verified

Sources for this page

  • The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution, habitat, identification characters and biology of the fishes of the British Isles and north-west Europe.States this directlyCitation checked — the work exists and is described correctly
  • FAO Species Identification Guides for Fishery Purposes and the FAO Species Catalogues — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Diagnostic identification characters, family placement, depth range and distribution as set out in the FAO species identification sheets for the eastern Atlantic and Mediterranean.States this directlyCitation checked — the work exists and is described correctly
  • The IUCN Red List of Threatened Species — International Union for Conservation of Nature (Conservation authority)Relied on for: The global Red List category and the assessment behind it, assessed 11 January 2014. A statement about the species across its range and not about any managed stock.States this directlyCitation checked — the work exists and is described correctly
  • General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated descriptions of species behaviour and regional angling practice, recorded as consensus rather than as scholarship.Background and mechanism onlyCitation checked — the work exists and is described correctly

How FishingHQ labels evidence is explained in the evidence policy.

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