Skip to content
FishingHQSearch

Before you spearfish — this comes first

  • Get proper instruction before you spearfish. A recognised freediving or spearfishing course teaches the things that actually kill people in this sport, and reading about them is not the same as being taught them.
  • Dive with a buddy, and dive one up, one down — one diver in the water, one on the surface watching them, every dive. A breath-hold blackout is silent and gives no warning; a watching buddy is the difference between an incident and a fatality.
  • Stay inside your own training and experience. Depth and breath-hold times are personal, they change day to day, and nobody else's numbers apply to you.
  • Understand the conditions before you enter the water: visibility, current, swell, tide, boat traffic and your exit. Conditions decide whether a dive is reasonable far more often than skill does.
  • Use equipment you have been shown how to use, check it before every session, and be visible — a marked float and line are how boat traffic knows you are there.
  • Never extend a dive for a fish. No catch is worth pushing a breath-hold, and the urge to take one more second is exactly what a blackout feels like from the inside — which is to say, like nothing at all.

Octopus and cuttlefish on breath-hold

Explainer · Last reviewed 2026-08-13

Hunting an animal that can see you thinking. Cephalopods are found rather than chased, and the practice raises a welfare question the rest of this catalogue does not have to answer.

Safety

Entanglement — Can cause serious injury or death

Extracting an animal from a den means a hand and arm in a hole, and the same trapping mechanism applies as for crustaceans — surge moves the diver while the arm stays put. An octopus itself grips rock with considerable force and will not be pulled out easily.

What reduces it: Do not reach into anything you could not withdraw from instantly, work with the surge rather than against it, and abandon any hole that grips. Surface on your own plan rather than on the animal's.

Shallow water blackout and breath-hold loss of consciousness — Can cause serious injury or death

Working an octopus out of a den takes longer than intended, and the impulse to finish rather than surface is precisely the pressure that produces a silent hypoxic blackout.

What reduces it: Leave the animal and return on the next dive. Dive one up and one down with a competent buddy watching every dive, and never extend a dive for a catch.

Fish welfare — Can cause injury needing treatment

Cephalopods have complex nervous systems and are included in animal welfare legislation in several jurisdictions. An animal handled at length, carried alive, or dispatched poorly is a specific welfare failure rather than a general one.

What reduces it: Dispatch immediately and properly rather than carrying the animal alive, take only what will be used, and do not handle the animal for entertainment.

Taking octopus and cuttlefish on a breath-hold is an old and geographically widespread practice — Mediterranean, Atlantic Iberia, Japan, the Pacific islands, and the temperate southern hemisphere — and Sprint 29's audit found the catalogue silent on it despite holding records for both animals.

IT IS A DIFFERENT HUNT FROM SPEARING FISH, IN KIND. A fish is spotted, approached and shot at a distance. An octopus is FOUND. The animal is in a den — a crevice, under a rock, in a discarded shell or pot — and its camouflage is so effective that it is essentially invisible until something gives it away. What experienced divers look for is not the octopus but the evidence of one: a midden of empty crab and shell debris outside a hole, a suspiciously tidy arrangement of stones, a den entrance that is too neat.

SO THE SKILL IS OBSERVATIONAL RATHER THAN BALLISTIC, and that is the most interesting thing about it. Cuttlefish differ again — they are found in open water over sand and weed, hover, and will approach a diver with obvious curiosity, changing colour and pattern continuously.

AND THE ANIMAL IS UNUSUALLY CAPABLE. Cephalopods have the most complex nervous systems of any invertebrate, demonstrate problem-solving and individual recognition in laboratory conditions, and change colour, pattern and skin texture within a second under direct neural control. An octopus that has been approached once behaves differently the second time. This is not an animal that behaves like a fish and pretending otherwise produces a poor description of the hunt.

WHICH IS WHY THE WELFARE QUESTION HAS TO BE STATED RATHER THAN AVOIDED. Cephalopod cognition and capacity for suffering are taken seriously enough that several jurisdictions include them in animal welfare legislation covering scientific procedures, which is a status no fish in this catalogue has. That does not settle whether they may be taken — they are a traditional and important food across much of their range, and this record takes no position on that — but it does mean the practical obligation is clear: dispatch immediately and properly, do not play with the animal, and do not take more than will be used.

THE REGULATORY PICTURE IS SPECIFIC AND VARIABLE. Some jurisdictions prohibit taking octopus while spearfishing, some set minimum weights, some close seasons around spawning, and some prohibit particular methods of extraction. Octopus stocks in several regions are under substantial commercial pressure. None of it is stated here.

Reading a den, and why the midden is the tell

The transferable skill in this activity is not a technique but a way of looking, and it works because of something specific about how an octopus lives.

AN OCTOPUS IS A CENTRAL-PLACE FORAGER. It occupies a den — a crevice, a hollow under a boulder, an empty shell, a discarded bottle or pot — and makes feeding excursions from it, returning with prey to eat in safety. Crabs, bivalves and gastropods are consumed at the den and the empty shells are pushed out.

THAT PRODUCES A MIDDEN. Over time a used den accumulates a scatter of clean, broken crab carapaces and drilled or gaped shells immediately outside its entrance, and that debris field is far more visible than the animal. A diver who has learned to read middens finds octopus in water where a diver looking for octopus finds none.

THE SECOND TELL IS ARRANGEMENT. Octopus frequently pile stones, shells or debris at the den mouth to narrow or block it, and the result looks deliberate because it is. A hole with a tidy stone doorstep in an otherwise disordered reef is worth a second look.

THE THIRD IS THE EYE. When nothing else gives it away, the animal is sometimes betrayed by a single horizontal pupil in a mass of texture that otherwise matches the rock perfectly — camouflage that resolves the instant you know what you are looking at and not before.

CUTTLEFISH ARE FOUND DIFFERENTLY. They hover over sand, eelgrass and weed edges rather than denning, they are often in open water, and they are actively curious about a diver — approaching, hovering, and flickering through colour changes. They are also, in the warmer months, gathered inshore to spawn, attaching ink-stained egg clusters to weed and structure, and taking spawning animals over their own egg masses is a decision worth making consciously rather than by default.

AND THE SAME OBSERVATIONAL SKILL HAS A NON-EXTRACTIVE USE. A diver who can find octopus can watch them, and a great deal of what is known about the animal's behaviour in the wild has come from exactly that.

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.

  • FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Life history, growth rate, longevity, sex-change pattern and habitat association recorded for the species concerned.States this directlyPassage read and verified
  • The IUCN Red List of Threatened Species — International Union for Conservation of Nature (Conservation authority)Relied on for: Assessment and population trend, and the life-history traits that determine sensitivity to size-selective removal.States this directlyCitation checked — the work exists and is described correctly
  • Words of the Lagoon: Fishing and Marine Lore in the Palau District of Micronesia — University of California Press, Berkeley, 1981 (Reference work)Relied on for: That traditional fishing practice encodes detailed observational knowledge of quarry behaviour, and that the practice is frequently the record of the biology.Background and mechanism onlyCitation checked — the work exists and is described correctly

Where to go next

Fish this applies to

What these connections rest on (1)

Practitioner consensus — 1 connection

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.

  • Common octopus

    A record pointing at the practice or mechanism that explains it, so the explanation lives once rather than being restated on every quarry page.

    • BlueWater Hunting and Freediving — BlueWater Freedivers, Ventura, California, 1995 (Practitioner report)Relied on for: Reef and blue-water breath-hold hunting practice, including quarry behaviour, approach, catch handling and the judgement involved in taking a shot.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 quarry behaviour and regional fishing practice, recorded as consensus rather than as scholarship.Background and mechanism onlyCitation checked — the work exists and is described correctly

Where it matters

What these connections rest on (1)

Authoritative guidance — 1 connection

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

  • Spearfishing

    A membership assertion rather than a topical one: this record teaches the discipline or its equipment, so the discipline's mandatory safety posture applies to it.

    • CMAS technical and sporting standards for underwater activities — Confédération Mondiale des Activités Subaquatiques (Standards body)Relied on for: Breath-hold spearfishing as a defined discipline with its own technical, equipment and safety standards, set out by the international underwater federation.States this directlyCitation checked — the work exists and is described correctly
    • DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: That the safety requirements of breath-hold diving apply across the discipline rather than to particular equipment or techniques within it.States this directlyPassage read and verified

    The explanation behind a practice, joined to the surface a reader arrives at so that the reasoning is reachable rather than orphaned.

    • DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Freediving safety, the mechanism of hypoxic blackout, and the requirement for direct supervision by a competent buddy on every dive.States this directlyPassage read and verified
    • AIDA International freediving education and safety standards — AIDA International (Water-safety or diver-training authority)Relied on for: Recognised freediving education and safety standards, including buddy procedure and the one-up-one-down principle.States this directlyCitation checked — the work exists and is described correctly

Related reading

What these connections rest on (1)

Practitioner consensus — 1 connection

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.

  • Taking crustaceans on breath-hold

    A mechanism edge between a record and the explanation beneath it. The link rests on established practitioner knowledge rather than on experiment, and the support level says so rather than borrowing an authority it does not have.

    • BSAC diving safety guidance and annual incident report — British Sub-Aqua Club (Water-safety or diver-training authority)Relied on for: Recreational diving safety practice including buddy procedure, surface marking, planning and the decision to abort.States this directlyCitation checked — the work exists and is described correctly
    • DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Freediving safety guidance including the buddy system, one-up one-down procedure and recovery from breath-hold incidents.States this directlyPassage read and verified

Safety reading

What these connections rest on (1)

Authoritative guidance — 1 connection

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

  • Breath-hold blackout

    A hazard carried by this subject, joined to the safety topic that explains the underlying mechanism.

    • DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Freediving safety, the mechanism of hypoxic blackout, and the requirement for direct supervision by a competent buddy on every dive.States this directlyPassage read and verified
    • AIDA International freediving education and safety standards — AIDA International (Water-safety or diver-training authority)Relied on for: Recognised freediving education and safety standards, including buddy procedure and the one-up-one-down principle.States this directlyCitation checked — the work exists and is described correctly

Check the rules before you fish

Fishing laws, bylaws, access rules, seasons, bait restrictions and permitted methods vary by location and can change. Check the current rules from the relevant authority and the water you intend to fish before fishing.

Check with:

  • Current national or regional law for where you are fishing
  • Current local bylaws
  • The relevant fisheries authority
  • The landowner, club or fishery whose water it is
  • Any restrictions specific to the species or the method you intend to use

Sources for this page

  • DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Freediving safety, the mechanism of hypoxic blackout and shallow-water blackout, and the requirement for direct supervision by a competent buddy on every dive.States this directlyPassage read and verified
  • AIDA International freediving education and safety standards — AIDA International (Water-safety or diver-training authority)Relied on for: Recognised freediving education and safety standards, including buddy procedure and the one-up-one-down principle.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: Life history, growth rate, longevity, sex-change pattern and habitat association recorded for the species concerned.States this directlyPassage read and verified
  • The IUCN Red List of Threatened Species — International Union for Conservation of Nature (Conservation authority)Relied on for: Assessment and population trend, and the life-history traits that determine sensitivity to size-selective removal.States this directlyCitation checked — the work exists and is described correctly

How FishingHQ labels evidence is explained in the evidence policy.

Share this page