Long, exposed teeth
The narrow, dagger-like teeth project forward and remain visible when the mouth is closed. They are designed to grip slippery prey rather than cut large pieces from it.
Sydney species guide
Grey Nurse Shark: Sydney’s Critically Endangered Shark
Identification, habitat, diet, conservation, Magic Point and the right way to share the water with one of Australia’s most misunderstood sharks.
Updated 6 August 2026 · Prepared by Abyss Scuba Diving · Science checked against Australian Museum, CSIRO and NSW DPIRD sources.
Calm, powerful and unmistakable
Meet the grey nurse shark
The grey nurse shark, Carcharias taurus, is a large coastal shark recognised by its pointed snout and rows of narrow teeth that remain visible even when its mouth is closed. In North America the same species is called the sand tiger shark; in southern Africa it is known as the spotted ragged-tooth shark.
Its appearance helped create a false reputation as a dangerous “man-eater”. In reality, grey nurse sharks usually cruise slowly around reefs, caves and sandy gutters and are not considered aggressive toward people when left undisturbed. They are wild predators, however, and calm behaviour should never be mistaken for permission to approach, touch or crowd them.[1]
- Scientific name
- Carcharias taurus
- Maximum length
- About 3.2 metres
- Newborn length
- About 1 metre
- Typical habitat
- Rocky reefs, caves and gutters
- Diet
- Fish, smaller sharks, rays and squid
- Young per litter
- Usually just two
Want to see one in Sydney? Learn what each experience requires before choosing a date.
Compare current shark-dive optionsGrey nurse shark facts
How to identify a grey nurse shark
At first glance the teeth dominate. Look beyond them and the species has a distinctive combination of features that separates it from Sydney’s whaler sharks, wobbegongs and Port Jackson sharks.
Two similar dorsal fins
The first and second dorsal fins are much closer in size than they are on most whaler sharks. The first dorsal fin also sits relatively far back on the body.
Grey-brown with spots
The back is grey-brown to bronze and the underside is pale. Rusty brown spots can appear along the rear body and tail, especially on younger sharks.
Large but slow cruising
Females can reach about 3.2 metres, while males are generally smaller. Their steady, open-mouthed swimming makes them look more threatening than their usual behaviour suggests.[2]
Why can they hover almost motionless?
A grey nurse shark can swallow air at the surface and hold it in its stomach. That extra buoyancy helps it hang above the seabed with remarkably little effort—an unusual ability among sharks.[1]
Where do grey nurse sharks live?
Habitat, distribution and movement
Grey nurse sharks occur in patchy populations across tropical to warm-temperate parts of the Atlantic, Indian and western Pacific oceans. Australia has separate east- and west-coast populations; the eastern population is the one encountered around Sydney.
Along eastern Australia, current NSW research documents movement from southern Queensland to the far south coast of New South Wales. These are not permanent residents of one cave. Tagged sharks have travelled more than 1,700 kilometres in a single north–south movement, using a chain of important aggregation sites along the coast.[3]
They favour rocky inshore reefs and islands where caves, overhangs and sandy or cobble-filled gutters provide shelter from current. By day, divers often see them hovering near the seabed or slowly patrolling a gutter. They may range farther from an aggregation site after dark to feed.
Sydney’s best-known aggregation site
Grey nurse sharks at Magic Point
Magic Point lies off Maroubra and is one of six grey nurse shark sites currently declared as critical habitat in NSW. Its caves, gutters and surrounding reef provide the kind of resting and aggregation habitat the species repeatedly uses.[3][6]
The most recent large NSW movement study found Magic Point was the main Sydney site used by tagged grey nurse sharks. Across the study, males and females were collectively detected in every month of the year, although an individual visit generally lasted only one to five days. About 95% of recorded shark depths at the site were between 14 and 22 metres, mostly close to the seabed and cave.[3]
That research does not make sightings predictable. Grey nurse sharks migrate, their numbers vary and ocean conditions can change the dive plan. Magic Point is important because it is genuine wild habitat—not because every visit produces the same encounter.
A life history built for a stable ocean
Reproduction is why recovery takes decades
Grey nurse sharks mature late and produce exceptionally few young. That strategy can work when adult survival is high, but it leaves the population poorly equipped to replace sharks lost to fishing gear, shark-control equipment or illegal killing.
01
Late maturity
Current east-coast research estimates that half of females are mature at about 2.59 metres and 11 years. First birth may often occur around age 14.
02
Only two pups
The largest embryo in each of the female’s two uteri consumes other embryos and unfertilised eggs. Usually only one pup survives in each uterus.
03
Long intervals
Females were traditionally described as breeding every second year, but recent tracking inferred three-year reproductive cycles in at least some mature east-coast females.
The 2025 NSW study notes that the newer three-year finding is based on six tracked females inferred to have produced at least two litters, so it should inform—not overstate—what is known.[3]
Encouraging progress, not mission accomplished
Why is the grey nurse shark critically endangered?
Australia’s eastern grey nurse sharks were heavily depleted during the twentieth century through targeted fishing, spearfishing and shark-control programs. The species has been protected in NSW since 1984, but accidental capture, retained fishing gear, shark-control interactions and very low genetic diversity continue to make recovery vulnerable.
1,096 estimated adults in 2017
1,423 estimated adults in 2023
Latest evidence: a slow increase
The 2025 close-kin estimate indicates that adult abundance increased from 1,096 in 2017 to 1,423 in 2023 (95% confidence interval: 921–1,925), with an estimated annual increase of 5% (95% confidence interval: 2.3–7.1%). This is encouraging, but the breeding population remains extremely small and genetic diversity remains low.[4]
Why you may still see “fewer than 500” online
That figure comes from much older visual surveys and listing evidence. It should not be repeated as the current population estimate. The newer result uses genetics and statistical modelling and refers specifically to estimated adult sharks, not a simple head count of every animal. The official critically endangered listing remains in force.[5]
Protect aggregation sites
Sites such as Magic Point concentrate sharks into small areas. As reviewed in August 2026, its critical-habitat declaration is complemented by a separate fishing closure restricting recreational line fishing with animal-derived bait; it is not a blanket ban on every form of fishing.[8]
Prevent fishing mortality
Even a small rise in adult or juvenile mortality can undo years of slow population growth. Correct identification, gear rules and reporting remain important.
Make tourism low impact
Shark encounters should build understanding without changing natural swimming, resting or feeding behaviour. The animal and its habitat come first.
Responsible shark encounters
Let the shark control the encounter
The NSW Code of Conduct for Diving with Greynurse Sharks applies across NSW waters, including critical-habitat and aggregation sites. Divers should follow the code, the operator’s briefing and all current site-specific laws; legal requirements always prevail.
- Do not touch, feed, chase or harass a grey nurse shark.
- Never block a cave entrance, gutter or the shark’s swimming path.
- Do not interrupt the shark’s natural patrol pattern for a closer look or photograph.
- Maintain neutral buoyancy, stay off the reef and keep movements slow and deliberate.
- Do not use scooters, horns or electronic shark-protection devices near an aggregation.
- Follow the code’s limit of no more than ten divers in a group and do not night dive at critical-habitat sites.
The code is voluntary. However, harming or interfering with a threatened species can be an offence and serious penalties may apply.[7]
Divers who want to turn good intentions into practical action can continue with the PADI AWARE Shark Conservation Course.
Teeth are not temperament
Are grey nurse sharks dangerous to humans?
Grey nurse sharks are large wild predators, so respectful distance and normal dive safety are essential. However, their exposed teeth exaggerate the threat they present. Australian species references describe them as slow-moving and not generally dangerous to people unless provoked.[1]
Responsible divers do not test that reputation. They avoid feeding, touching, cornering or making sudden approaches and follow the guide’s instructions throughout the encounter.
Common questions
Grey nurse shark FAQs
What is a grey nurse shark?
A grey nurse shark is the Australian common name for Carcharias taurus, a large coastal shark also called the sand tiger shark in North America and the spotted ragged-tooth shark in southern Africa. “Gray nurse shark” is a spelling variant sometimes seen online.
How large do grey nurse sharks grow?
They grow to about 3.2 metres. Females are generally larger than males, and pups are already about one metre long when born.
What do grey nurse sharks eat?
Eastern Australian research has recorded bony fish, smaller sharks, rays and squid in their diet. They swallow prey whole and may range farther from daytime aggregation areas while foraging.
Why are their teeth always visible?
The long, narrow teeth project forward and remain visible even when the mouth is closed. They help grip slippery fish and squid; visible teeth do not mean the shark is displaying aggression.
Why is the east-coast population critically endangered?
Historical targeted killing and shark-control activities caused a severe decline. Today, accidental fishing capture, fishing-gear injuries, shark-control interactions, low genetic diversity and an extremely slow reproductive rate continue to limit recovery.
How many grey nurse sharks are left in eastern Australia?
The 2025 close-kin model estimated 1,423 adults in 2023 (95% confidence interval: 921–1,925), up from 1,096 adults in 2017. This is an adult estimate, not a head count of every shark and not the total population.
Can grey nurse sharks be seen at Magic Point all year?
Tagged males and females were collectively detected at Magic Point across every month in the latest NSW study, but individual sharks moved in and out and each visit was usually short. Sightings and shark numbers can never be guaranteed.
Can I dive with grey nurse sharks in Sydney?
Yes. Magic Point is Sydney’s signature boat dive for suitably certified divers, while other experiences may suit different qualification levels. Compare the current requirements and live options on the Sydney shark diving guide.
What guidance and laws apply when diving with grey nurse sharks?
Follow the voluntary NSW code: do not touch, feed, chase, harass, entrap or block a shark; keep caves, gutters and swimming paths clear; avoid mechanical devices; keep groups to no more than ten divers; and do not night dive at critical-habitat sites. Harming or interfering with a threatened species can be an offence, and all current legal restrictions and operator directions must be followed.
Keep learning, then dive responsibly
Explore Sydney’s shark encounters
This species guide explains the animal. Use the pages below to choose a dive that matches your certification, recent experience and conservation interests.
Evidence and further reading
Authoritative sources and further reading
Biology, status and Magic Point claims were checked against Australian museum, government and research sources. Population figures are identified by year so older estimates are not presented as current.
- Australian Museum: Greynurse Shark species profile
- Fishes of Australia: Carcharias taurus
- NSW DPIRD (2025): Occupation of aggregation sites and migratory movements of the Grey Nurse Shark
- NESP Marine and Coastal Hub / CSIRO (2025): Eastern grey nurse shark population abundance and trend
- Australian Government DCCEEW (updated 2026): EPBC Act listed sharks and rays
- NSW DPI (2013): Greynurse Shark critical-habitat declaration
- NSW DPI (2014): Protecting the Greynurse Shark—used here for the voluntary diving code; current legislation should be checked separately
- NSW DPI (2022): Greynurse Shark Protection Fishing Closure Notification
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