Clouded Angelshark

• Maximum length1.63 m (5.3 ft)
• WeightNo reliable published figure
• LifespanUnknown; never aged
• Depth rangeShelf and upper slope, to about 330 m (1,080 ft)
• DietBottom fish, squid, octopus and crustaceans
• IUCN statusEndangered

What a clouded angelshark looks like

An angel shark is built like a compromise between a shark and a ray, and the first job in identifying one is proving it is not a ray at all. Run a finger along the front edge of the broad pectoral fin: in every angel shark, including this one, the fin is free of the head, with a deep notch separating the two, and the five gill slits lie in that notch on the side of the body rather than flat on the underside. Rays have fused fins and strictly ventral gills. The mouth is at the very front of the head, not slung underneath, and two large spiracles sit behind the eyes to draw in clean water while the animal lies buried.

The colour is what names the species. The back is brown, sometimes washed with blue-black, and scattered across it are pale flecks and small dark dots that break the outline into cloud-like patches; the tips of the pectoral fins carry rounded black spots, and both small dorsal fins, set far back near the tail, have pale margins. The underside is off-white.

Details of the head separate it from its neighbours. The eyes are large, the nostrils carry a pair of smooth-edged flaps with tapering barbels, and a band of enlarged thorn-like denticles runs down the midline of the back. Inside the mouth the teeth are slim and needle-sharp in both jaws — nothing here is designed to cut, only to hold.

How big is a clouded angelshark?

The longest specimen ever measured was 1.63 m (5.3 ft), and that figure has stood unchallenged for decades. Most animals brought up by trawlers are well under that, in the 70 cm to 1.2 m range, and a metre-long clouded angelshark already looks broad and heavy because of the width of its pectoral fins.

Weight has never been published in any usable form. That is not an oversight on this page: angel sharks are landed mixed with rays and rarely weighed as individuals, and no study has produced a length–weight relationship for Squatina nebulosa. Rather than borrow a figure from a different species, the honest answer is that nobody knows.

The same gap runs through the rest of the size data. No reliable length at sexual maturity has been recorded for either sex, no size at birth has been measured, and no newborn has been described in the literature. In better-studied angel sharks females grow larger than males and pups are born at roughly a quarter of the adult length, which would put a newborn clouded angelshark somewhere around 25 to 30 cm, but that is an inference rather than a measurement. The size bar below uses the one solid number the species has: 1.63 m, against a 1.8 m diver.

Where clouded angelsharks live

The whole species fits into one corner of one ocean. Records run from the south-eastern Sea of Japan and the Pacific coast of Japan, across to the Korean Peninsula and South Korea, then down through the Yellow Sea and East China Sea along the coast of China to Taiwan, between roughly 47°N and 22°N. Reports from the South China Sea have never been confirmed and may involve other angel sharks; treat them as unverified.

Within that strip it is a shelf animal. It lives on sand, mud and shell gravel, the kind of featureless bottom that suits an ambush predator, and it has been recorded down to about 330 m (1,080 ft) on the upper slope. It is not a deep-sea shark and not a reef shark: it belongs to the soft ground in between, which happens to be precisely where the region's trawl fleets work.

No country or state guide on SharkSider lists the clouded angelshark, because it is not an animal recreational divers or swimmers encounter. It spends the daylight hours buried with only its eyes and the top of its head above the sediment, and the people who see it are almost always sorting a trawl catch on deck. That invisibility is also why its distribution map is drawn from fishery landings rather than from surveys.

How a clouded angelshark hunts

Angel sharks do not chase anything. The animal settles onto soft ground, shuffles its pectoral fins to throw sediment over its back, and waits — sometimes for days in the same spot — with its eyes clear of the mud and its body temperature and oxygen demand as low as a shark's can go. Water for the gills comes in through the spiracles on top of the head rather than through the mouth, so the ambush is not given away by breathing.

When a fish, a squid or a crab drifts within about a head's length, the strike is one of the fastest movements in the sea. The head lifts, the jaws shoot forward on long protrusible cartilage, and the needle teeth close on the prey in roughly a tenth of a second — too quick for the eye to separate the stages. Prey is swallowed whole; there is no cutting and no shaking.

Stomach contents from angel sharks in the region point to bottom-living fish as the mainstay, with squid, octopus and crustaceans making up the remainder. Detailed diet work specific to Squatina nebulosa has not been done, so the list is drawn from what the genus takes on the same grounds. Feeding is mostly nocturnal or crepuscular, when small fish move over open sediment and the shark's disadvantage — an almost total inability to pursue anything — stops mattering.

Behaviour and the senses of a buried shark

Almost everything a clouded angelshark does is a variation on lying still. It is sedentary, solitary and slow, and when it does swim it moves in a stiff, undulating glide a few centimetres above the bottom before dropping and burying again. Angel sharks tagged in other parts of the world shift ground seasonally, moving shallower in summer and deeper in winter, and the northern end of this species' range, where the Sea of Japan cools sharply, almost certainly forces the same pattern.

Camouflage does the work that speed does in other sharks. The mottled back matches sand and shell gravel closely enough that a buried angel shark is invisible from a metre away, and the flattened body leaves no shadow. Enlarged thorns along the midline of the back give some protection against anything that tries to take a bite from above.

The sensory kit is arranged for the job. The eyes sit on top of the head and look upward, which is the only direction prey can come from. Electroreceptive pores concentrated around the snout and jaws pick up the muscle activity of a fish passing overhead, and the lateral line registers its wake. Hearing and smell matter less than in a roaming shark. What this animal lacks is stamina: its muscle is built for one explosive strike and very little else, which is why a hooked or netted angel shark tires within minutes.

Birth and lifespan: what is actually known

Every angel shark studied so far is ovoviviparous, also called aplacental viviparous: the eggs hatch inside the mother, the embryos live on their yolk sacs with no placental connection, and the pups are born free-swimming and fully formed. The clouded angelshark is assumed to do the same, and there is no reason to doubt it, but the assumption rests on family membership rather than on a dissected pregnant female.

What has not been recorded is everything a fisheries manager would want. No litter from this species has been counted. Gestation length is unknown. The breeding season, the pupping grounds and the interval between litters are all blank. In related angel sharks litters run from about eight to twenty pups after a gestation of roughly ten months to a year, with females resting a year between pregnancies, and the clouded angelshark is likely to sit in that range — but the page will not present a guess as a measurement.

Age is the same story. No vertebral ageing study has been published, so the maximum lifespan is unknown. Angel sharks elsewhere reach twenty-five to thirty-five years and mature late, a life history that recovers slowly from fishing (see how long sharks live). For a species already listed as Endangered, this blank page of reproductive data is itself part of the problem: you cannot set a catch limit for an animal whose breeding rate nobody has measured.

Are clouded angelsharks dangerous to people?

The SharkSider database has no incident attributed to this species, and that is unsurprising. The clouded angelshark lives on trawl grounds rather than on beaches, it is rare, and it takes flight the moment anything large approaches. Swimmers and snorkellers in Japanese or Korean water are not at risk from it in any realistic sense.

The one genuine caution concerns handling. Angel sharks worldwide have a well-earned reputation among fishermen and divers for whipping the head round and biting when grabbed, stepped on or pinned, and those needle teeth and fast jaws make a deep puncture wound on a hand or a calf. Every such case is provoked, and the fix is simple: do not touch a buried angel shark, and give one on a trawl deck the same respect you would give a moray. That distinction, between an animal that bites in defence and one that hunts people, is the whole point of our list of the least dangerous sharks. Japan's actual bite record, involving entirely different species, is set out on the shark attacks in Japan page.

The SharkSider database has no incident attributed to this species. The database draws on the International Shark Attack File, the Global Shark Attack File and verified local reports, and is updated weekly.

Why the clouded angelshark is Endangered

The IUCN Red List assesses Squatina nebulosa as Endangered. The reasoning is straightforward and grim: a small range, a preference for exactly the soft-bottom grounds that bottom trawlers work hardest, no refuge in deep water, and a reproductive rate too slow to absorb the losses. The East China Sea, the Yellow Sea and the coastal waters of Japan and Korea carry some of the heaviest demersal fishing effort anywhere, and it has been sustained for a century.

The species is not targeted. It is bycatch, taken in bottom trawls, set nets and traps, and because a flat shark is swept up rather than avoided, a trawl that catches the bottom catches angel sharks. Landings are sold for meat locally. The species is not listed on CITES, has no international protection and holds no specific national protection across most of its range, so there is no legal mechanism currently slowing the decline.

Angel sharks as a family are among the most threatened groups of sharks on earth, with more than half of the roughly twenty-five species assessed as threatened — the Atlantic angel shark, the African angelshark and the Japanese angelshark among them. The pattern is identical everywhere: shallow shelf, bottom trawls, no escape. Our page on why sharks are endangered sets out the mechanism in full.

Telling it from the other angel sharks

Angel sharks are a single family, Squatinidae, and a single genus, Squatina, making up one of the eight orders of sharks on their own. Because they all share the same flattened body plan, species are separated on pattern and on the fine structure of the nasal flaps and barbels rather than on shape.

The one that matters here is the Japanese angelshark, which lives on the same grounds and is caught in the same nets. It is plainer, a fairly even reddish or greyish brown with small dark dots, and it lacks the broken, cloud-like mix of pale flecks and rounded black pectoral blotches that marks this species. The Taiwan angelshark, a smaller and far more obscure animal of the same seas, is the other regular source of confusion, and the clouded angelshark's more varied markings are the practical way to separate them.

Elsewhere in the world the family repeats itself with local variations: the sawback angelshark of the Indo-West Pacific, with a prominent row of spines down the back; the Pacific angelshark off California and Mexico; the African angelshark; the angular angelshark and Argentine angelshark of South America; and the Atlantic angel shark of the eastern United States.

• Japanese Angelsharkspecies profile
• Sawback Angelsharkspecies profile
• Pacific Angelsharkspecies profile
• African Angelsharkspecies profile
• Angular Angelsharkspecies profile
• Atlantic Angel Shark (Sand Devil)species profile

Written and reviewed by

SharkSider Editorial Team

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 November 9, 2022 · Last updated September 22, 2026 · No incident attributed to this species in the SharkSider attack database, which is updated weekly.