The blind shark (Brachaelurus waddi) is a small carpet shark found only along the east coast of Australia, from southern Queensland to Jervis Bay, growing to about 1.2 m (4 ft) but usually well under a metre. It is brown with white flecks, with a blunt head, tiny high-set eyes, nasal barbels and two equal dorsal fins pushed far back towards the tail.
It feeds at night by suction on crabs, shrimp, squid, anemones and small fish. Females bear 7–8 live pups each summer. Its IUCN category is Least Concern. It is harmless unless handled, when its jaws clamp and do not let go; the SharkSider database holds one minor bite, in 2004.
- Maximum length1.22 m (4 ft); most under 1 m
- WeightNo reliable maximum; a few kilograms at full size
- LifespanUnknown; no validated age study
- Depth rangeTide pools to 140 m (460 ft)
- DietSmall fish, crabs, shrimp, squid, sea anemones
- IUCN statusLeast Concern (assessed 2025)
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Chondrichthyes
- Order
- Orectolobiformes
- Family
- Brachaeluridae
- Genus
- Brachaelurus
- Species
- Brachaelurus waddi
- Family (common)
- Blind sharks
- Also known as
- Brown catshark (Australian fishermen's name)
On this page
How to recognise a blind shark
A blind shark is a stubby, cylindrical fish with a broad flat head and a snout so blunt it looks squared off. The eyes are the giveaway: tiny ovals perched on top of the head, each ringed by a raised ridge, with a large spiracle behind. Under the snout sit two short nasal barbels and a pair of grooves that run from the nostrils into the mouth, the arrangement shared by all carpet sharks. The mouth is small and set well forward, with 32–34 rows of tiny teeth in the upper jaw and 21–29 in the lower, each with a central point and small side cusplets.
The fin plan is unusual and useful. Both dorsal fins are the same size and both sit far back, the first beginning above the pelvic fins; the anal fin is about half their size and tucked just ahead of the tail; the tail itself is low, with almost no lower lobe, and makes up roughly a quarter of the body. The pectoral fins are large and rounded, and the shark uses them to shuffle along the bottom.
Colour runs from golden brown to nearly black on the back, paler below, with scattered white flecks. Juveniles carry dark saddles across the back that fade with age. The only species it can honestly be mistaken for is its sole relative, the bluegray carpetshark of southern Queensland, which is greyer, more strongly banded when young and far rarer; the local wobbegongs are much flatter and fringed.
How big do blind sharks get?
Small. The largest blind shark on record measured about 1.22 m (4 ft), and animals over a metre are exceptional; most adults a diver meets on a Sydney reef are 60–90 cm (2–3 ft) long. Nobody has published a reliable maximum weight, and there is no reason to expect anything beyond a few kilograms for the biggest females. The old claim that the species "reaches 3–4 ft" is true only at the very top of the range.
Newborns are 15–18 cm (6–7 in), already fully formed and banded. Males mature at about 62 cm (24 in) and females at about 66 cm (26 in), so a shark that looks half-grown is often already breeding. Females grow slightly larger than males, which is the usual pattern in carpet sharks. How old a blind shark is at maturity, or at 1.2 m, is not known: no study has validated the growth rings in its vertebrae, and the aquarium animals that have lived for many years give a floor, not a ceiling. There is no size photograph for this species; the bar below scales the maximum length against a 1.8 m diver, which shows just how small a full-grown blind shark is.
Where blind sharks live
Every verified blind shark has come from one stretch of coast: the subtropical and warm-temperate east coast of Australia, from Mooloolaba on Queensland's Sunshine Coast south through Moreton Bay, the northern New South Wales rivers and Sydney to Jervis Bay. Records further south, towards Ulladulla, are unconfirmed. Within that range it is common, and around Sydney it is one of the sharks a snorkeler is most likely to see.
It is a shallow-water animal. Blind sharks live in tide pools and the surge zone on rocky reefs, among kelp and seagrass, and around the mouths of estuaries, in water that is often less than 10 m deep; the deepest records are from about 140 m (460 ft) on the outer shelf. By day they lie under ledges and in caves, sometimes several together, and use the same refuge for weeks. Water temperature runs from about 15 °C in a southern winter to the mid-20s in a Queensland summer.
Two physiological tricks explain how it lives where it does. It tolerates the low-oxygen water of a tide pool at low tide, and it survives out of water for hours, up to 18 in the published accounts, if a pool drains or a wave strands it. Neither is unique among carpet sharks (the epaulette shark is the champion), but the blind shark is the only one doing it on cold-water reefs south of Sydney.
What blind sharks eat
The blind shark is a night feeder. After dark it leaves its crevice and works slowly across the reef and adjacent sand, pushing its snout into holes and under weed, and it takes whatever small animal it can draw into its mouth: crabs and shrimp above all, then squid and octopus, sea anemones pulled off the rock, worms, and small reef fish such as gobies, blennies and juvenile wrasse. The barbels and the nasal grooves sample the water and the substrate for scent, and the electroreceptors on the snout pick up a crab buried in sand.
The feeding mechanism is suction. The mouth is small but the throat and the muscles around it are powerful; the shark expands its mouth cavity in a fraction of a second and the prey, with a gulp of water, is pulled in and swallowed. The tiny multi-pointed teeth are for gripping, not cutting, which is why a blind shark cannot bite a piece out of anything larger than its own mouth, and also why one that clamps onto a wetsuit holds on so stubbornly: the same jaw muscles that make the suction lock the grip.
The tawny nurse shark and the Atlantic nurse shark feed the same way on a larger scale; anyone who has watched a nurse shark inhale an octopus from a hole has seen a blind shark's dinner in miniature.
Behaviour and the eyes that close
The name deserves a paragraph, because it is wrong. A blind shark's eyes are small but they work, and it uses them to pick a refuge and to avoid a diver's light. What it does, and what no other shark on the coast does so visibly, is retract the eyeballs into the head and draw thick, fleshy eyelids down over them when it is lifted from the water. To a fisherman hauling one over the gunwale the fish appears to have no eyes at all, and the name stuck.
Everything else about its behaviour follows from being small, slow and nocturnal. Blind sharks are sedentary; tagged individuals return to the same ledge night after night and appear to hold small home ranges on a single reef. They are not territorial, several will share a cave, and they do not migrate. Swimming is an eel-like wriggle of the tail with the pectoral fins used as props on the bottom, and a disturbed shark moves off only a few metres before wedging itself under the nearest rock.
Like all carpet sharks it can pump water over its gills while lying still, so it does not need to swim to breathe (see how sharks breathe). Add tolerance of low oxygen and of hours in air, and you have an animal built for the one habitat most sharks cannot use: the rock pool between tides.
Reproduction and lifespan
Blind sharks give birth to live young. The mode is yolk-sac viviparity (often called ovoviviparity or aplacental viviparity): the eggs hatch inside the mother's uterus and each embryo lives on its own yolk until birth, with no placenta and no feeding on other eggs. Breeding follows a yearly cycle, with pups born in summer, and litters are small, typically 7–8. The pups measure 15–18 cm at birth and carry the dark saddles that fade as they grow. Nobody has measured gestation directly, and the figures sometimes quoted are guesses.
Maturity comes at about 62 cm in males and 66 cm in females. Because no validated age-and-growth study exists, we cannot say how many years that takes, only that a shark this size and this slow probably needs several. Lifespan is likewise unknown in the wild; blind sharks are hardy in captivity and public aquaria in Australia have kept them for well over a decade, but a captive floor is not a wild maximum (how long sharks live explains why the two differ).
There is no known nursery. Newborns appear on the same shallow reefs as the adults, and because adults cannot eat anything approaching their own size, the young have little to fear from their parents; their main predators are larger reef fish, wobbegongs and the occasional Port Jackson shark, which crunches through anything it can hold.
Are blind sharks dangerous to people?
Not in any meaningful sense. A blind shark's mouth is smaller than a coffee cup, its teeth cannot cut, and its response to a diver is to back into a crevice. The SharkSider database holds exactly one record: a snorkeler at Caves Beach, New South Wales, in February 2004, bitten on the leg by a 60 cm shark logged as a blind or brown shark, with minor injury and no fatality. The species is not implicated in anything else, anywhere, in more than a century of records.
The one real hazard is handling. Fishermen who unhook a blind shark carelessly, and divers who grab one to pose for a photograph, discover that the suction jaws that inhale crabs clamp onto a hand or a wetsuit and stay clamped; there are well-attested cases of a blind shark having to be prised off with a knife or a dive tool because it would not let go. The bite itself is a ring of pinpricks, not a wound, but the grip is alarming. The fix is obvious: do not pick them up. For the sharks on the same coast that do bite unprovoked, see the Australian attack record, and for general advice our page on surviving a shark encounter.
Blind Shark incidents in the SharkSider database
- Records attributed1
- Fatal0 (0%)
- Years covered2004–2004
- Since 20001 incidents, 0 fatal
- Most common activitySwimming & wading
- Most recordsAustralia (1)
The six most recent records attributed to the blind shark
- 11 February 2004 · Caves Beach, New South Wales, AustraliaSnorkeling — Leg bittenRecorded as: 60 cm [23.6"] blind or brown shark · not fatal
Records are matched on the shark named in each report (“blind”), so they include incidents where the species was reported rather than confirmed. Full records by country on the shark attacks pages.
Conservation status
The IUCN Red List assesses the blind shark as Least Concern. The reasoning is straightforward: the species is common throughout a range that lies entirely in Australian waters, most of its habitat is shallow rocky reef that trawlers cannot work, and there is no fishery for it. The flesh smells and tastes strongly of ammonia and is not sold. Blind sharks are caught incidentally in lobster pots, fish traps and occasionally in prawn trawls, and because they survive hours out of water they are almost always alive when released. A small number are collected for the aquarium trade, where they do well.
The species has no listing under CITES or the Convention on Migratory Species, and no specific national protection; it is covered only by the general fisheries rules of New South Wales and Queensland, which set bag limits for sharks taken by recreational fishers. Australia's Environment Protection and Biodiversity Conservation Act lists none of the blind shark family.
The threats that exist are local and slow: coastal development, stormwater and sediment on the reefs of Sydney and the Gold Coast, and loss of kelp and seagrass. None is thought to have reduced the population. The one caveat the assessors raise is the small range; a species confined to 1,500 km of coast has nowhere else to go if that coast changes, which is why even Least Concern endemics are worth watching (see why sharks are endangered).
Similar species and close relatives
The blind shark has one living relative: the bluegray carpetshark (Brachaelurus colcloughi), a rarer and more northerly species of southern Queensland and northern New South Wales, greyer in colour, more strongly banded as a juvenile and listed as Vulnerable. Together they make up the family Brachaeluridae, the smallest family of carpet sharks. Their nearest cousins are the wobbegongs (the spotted and ornate wobbegongs share the same Sydney reefs), the bamboo and epaulette sharks of the tropics, such as the brownbanded bamboo shark, and, more distantly, the nurse sharks and the zebra shark.
In the water the sharks most likely to be confused with a blind shark are not close relatives. The draughtsboard shark, a swellshark of southern Australia, is also brown, blotched and sluggish but has a catshark's cat-like eyes on the side of the head and a longer tail; juvenile Port Jackson sharks have a dorsal spine and harness-like markings. Any small brown shark with its eyes on top of its head, barbels under the snout and two matching dorsal fins at the back is a blind shark, and on the New South Wales coast there is nothing else it can be.
- The Bluegray Carpetsharkspecies profile
Epaulette Sharkspecies profile
Brownbanded Bamboo Sharkspecies profile
Spotted Wobbegongspecies profile
Tawny Nurse Sharkspecies profile- Draughtsboard Sharkspecies profile
Frequently asked questions
Why is it called a blind shark if it can see?
Because of what it does out of water. When a blind shark is lifted from the sea it retracts its eyeballs into its head and draws thick eyelids over them, so fishermen hauling one aboard saw a shark with apparently no eyes. Underwater the small eyes are open and fully functional; the shark is not blind at all.
How big do blind sharks get?
The largest recorded was about 1.22 m (4 ft), but most adults are 60 to 90 cm long and sharks over a metre are unusual. Pups are 15 to 18 cm at birth, males mature at about 62 cm and females at about 66 cm. No reliable maximum weight has been published; a full-grown female weighs only a few kilograms.
Where do blind sharks live?
Only along the east coast of Australia, from Mooloolaba in southern Queensland to Jervis Bay in New South Wales. They live on shallow rocky reefs, in tide pools, kelp and seagrass and around estuary mouths, usually in less than 10 m of water, though they have been recorded to 140 m. By day they hide in caves and crevices.
What do blind sharks eat?
Small bottom animals taken at night by suction: crabs, shrimp, squid and octopus, sea anemones, worms and small reef fish such as gobies and blennies. The tiny teeth grip rather than cut, so a blind shark can only eat what fits in its small mouth and has no way of feeding on anything larger.
Are blind sharks dangerous?
No. The SharkSider database holds a single minor incident, a snorkeler bitten on the leg by a 60 cm shark at Caves Beach, New South Wales, in 2004. Blind sharks only bite when handled, but then their suction jaws clamp on and are hard to release, so the rule is simply not to pick one up or grab it for a photograph.
How do blind sharks reproduce?
They bear live young by yolk-sac viviparity: the eggs hatch inside the mother and each pup lives on its yolk until birth, without a placenta. Breeding is annual, with litters of about 7 to 8 pups born in summer at 15 to 18 cm. Gestation has not been measured directly, and there is no known nursery ground separate from the adult reefs.
How long do blind sharks live?
Nobody knows. No validated study has counted and checked the growth rings in blind shark vertebrae, so there is no wild lifespan or age at maturity for the species. Public aquaria in Australia have kept individuals for well over ten years, which shows the shark is hardy but sets only a minimum, not a maximum.
Can a blind shark survive out of water?
For a surprisingly long time. Published accounts describe blind sharks surviving up to 18 hours out of the sea, and they routinely cope with the warm, oxygen-poor water of a rock pool at low tide. Along with pumping water over their gills while lying still, this lets them live in the intertidal zone that most sharks cannot use.
Are blind sharks endangered?
No. The IUCN lists the species as Least Concern: it is common across its range, most of its rocky-reef habitat is beyond the reach of trawlers, and there is no fishery because the flesh tastes of ammonia. It has no CITES or CMS listing and no specific legal protection. The only concern is its small range, confined to one Australian coast.
Can you keep a blind shark in an aquarium?
Blind sharks are among the hardiest sharks in captivity and are kept by Australian public aquaria and some private keepers, where they accept prepared food and tolerate handling of water quality that would kill other species. They still need a large tank with rock shelters and cool, well-filtered water, and in Australia collection is subject to state fisheries rules.
References
A small team focused on researching sharks and making marine biology easy to understand. Every page is reviewed against current species records and the SharkSider attack database, and updated when new incidents or research appear.
Published August 19, 2022 · Last updated September 22, 2026 · 1 incident attributed to the blind shark in the SharkSider attack database (0 fatal), updated weekly.
