Great white shark

The great white shark (Carcharodon carcharias), also known as the white shark, white pointer, or simply great white, is a species of large mackerel shark which can be found in the coastal surface waters of all the major oceans. It is the only known surviving species of its genus Carcharodon. The great white shark is notable for its size, with the largest preserved female specimen measuring 5.83 m (19.1 ft) in length and around 2,000 kg (4,410 lb) in weight at maturity.[3] However, most are smaller; males measure 3.4 to 4.0 m (11 to 13 ft), and females measure 4.6 to 4.9 m (15 to 16 ft) on average.[4][5] According to a 2014 study, the lifespan of great white sharks is estimated to be as long as 70 years or more, well above previous estimates,[6] making it one of the longest lived cartilaginous fishes currently known.[7] According to the same study, male great white sharks take 26 years to reach sexual maturity, while the females take 33 years to be ready to produce offspring.[8] Great white sharks can swim at speeds of 25 km/h (16 mph)[9] for short bursts and to depths of 1,200 m (3,900 ft).[10]

Great white shark
Temporal range:
Male off Isla Guadalupe, Mexico
Illustration showing a shark and a human diver. The shark is about three times longer than the human.
Size comparison with human

Vulnerable  (IUCN 3.1)[1] (Global)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Order: Lamniformes
Family: Lamnidae
Genus: Carcharodon
A. Smith, 1838
Species:
C. carcharias
Binomial name
Carcharodon carcharias
  Global range as of 2010
Synonyms
  • Squalus carcharias Linnaeus, 1758
  • Carharodon carcharias (Linnaeus, 1758)
  • Squalus caninus Osbeck, 1765
  • Carcharias lamia Rafinesque, 1810
  • Carcharias verus Cloquet, 1817
  • Squalus vulgaris Richardson, 1836
  • Carcharias vulgaris (Richardson, 1836)
  • Carcharodon smithii Agassiz, 1838
  • Carcharodon smithi Bonaparte, 1838
  • Carcharodon rondeletii Müller & Henle, 1839
  • Carcharodon capensis Smith, 1839
  • Carcharias atwoodi Storer, 1848
  • Carcharias maso Morris, 1898
  • Carcharodon albimors Whitley, 1939

The great white shark is arguably the world's largest-known extant macropredatory fish, and is one of the primary predators of marine mammals, such as pinnipeds and dolphins. The great white shark is also known to prey upon a variety of other animals, including fish, other sharks, and seabirds. It has only one recorded natural predator, the orca.[11]

The species faces numerous ecological challenges which has resulted in international protection. The International Union for Conservation of Nature lists the great white shark as a vulnerable species,[1] and it is included in Appendix II of CITES.[12] It is also protected by several national governments, such as Australia (as of 2018).[13] Due to their need to travel long distances for seasonal migration and extremely demanding diet, it is not logistically feasible to keep great white sharks in captivity; because of this, while attempts have been made to do so in the past, there are no known aquariums in the world believed to house a live specimen.[14]

The great white shark is depicted in popular culture as a ferocious man-eater, largely as a result of the novel Jaws by Peter Benchley and its subsequent film adaptation by Steven Spielberg. Humans are not a preferred prey,[15] but nevertheless it is responsible for the largest number of reported and identified fatal unprovoked shark attacks on humans.[16] However, attacks are rare, typically occurring fewer than 10 times per year globally.[17][18]

Taxonomy

The great white is the sole recognized extant species in the genus Carcharodon, and is one of five extant species belonging to the family Lamnidae.[19] Other members of this family include the mako sharks, porbeagle, and salmon shark. The family belongs to the Lamniformes, the order of mackerel sharks.[20]

Etymology and naming history

The name 'great white shark' likely comes from the shark's size, as well as the white underside exposed on beached sharks.

The English name 'white shark' and its Australian variant 'white pointer'[21] is thought to have come from the shark's stark white underside, a characteristic feature most noticeable in beached sharks lying upside down with their bellies exposed.[22] Colloquial use favours the name 'great white shark', with 'great' perhaps stressing the size and prowess of the species,[23] and "white shark" having historically been used to describe the much smaller oceanic white-tipped shark, later referred to for a time as the "lesser white shark". Most scientists prefer 'white shark', as the name "lesser white shark" is no longer used,[23] while some use 'white shark' to refer to all members of the Lamnidae.[20]

The scientific genus name Carcharodon literally means "jagged tooth", a reference to the large serrations that appear in the shark's teeth. It is a portmanteau of two Ancient Greek words: the prefix carchar- is derived from κάρχαρος (kárkharos), which means "jagged" or "sharp". The suffix -odon is a romanization of ὀδών (odṓn), a which translates to "tooth". The specific name carcharias is a Latinization of καρχαρίας (karkharías), the Ancient Greek word for shark.[19] The great white shark was one of the species originally described by Carl Linnaeus in his 1758 10th edition of Systema Naturae, in which it was identified as an amphibian and assigned the scientific name Squalus carcharias, Squalus being the genus that he placed all sharks in.[24] By the 1810s, it was recognized that the shark should be placed in a new genus, but it was not until 1838 when Sir Andrew Smith coined the name Carcharodon as the new genus.[25]

There have been a few attempts to describe and classify the great white before Linnaeus. One of its earliest mentions in literature as a distinct type of animal appears in Pierre Belon's 1553 book De aquatilibus duo, cum eiconibus ad vivam ipsorum effigiem quoad ejus fieri potuit, ad amplissimum cardinalem Castilioneum. In it, he illustrated and described the shark under the name Canis carcharias based on the jagged nature of its teeth and its alleged similarities with dogs.[lower-alpha 1] Another name used for the great white around this time was Lamia, first coined by Guillaume Rondelet in his 1554 book Libri de Piscibus Marinis, who also identified it as the fish that swallowed the prophet Jonah in biblical texts.[26] Linnaeus recognized both names as previous classifications.[24]

Fossil ancestry

Carcharias taurus

Cetorhinus maximus

Lamna nasus

Lamna ditropis

Carcharodon carcharias

Isurus oxyrinchus

Isurus paucus

Phylogenetic relationship between the Great white shark and other sharks based on molecular data conducted by Human et al. (2006)[27]

Molecular clock studies published between 1988 and 2002 determined the closest living relative of the great white to be the mako sharks of the genus Isurus, which diverged some time between 60 and 43 million years ago.[28][29] Tracing this evolutionary relationship through fossil evidence, however, remains subject to further paleontological study.[29]

The original hypothesis of the great white shark's origin held that it is a descendant of a lineage of mega-toothed sharks, and is closely related to the prehistoric megalodon.[29][30] These sharks were considerably larger in size, with megalodon attaining an estimated length of up to 14.2–20.3 m (47–67 ft).[31][32][33] Similarities between the teeth of great white and mega-toothed sharks, such as large triangular shapes, serrated blades, and the presence of dental bands, led the primary evidence of a close evolutionary relationship. As a result, scientists classified the ancient forms under the genus Carcharodon. Although weaknesses in the hypothesis existed, such as uncertainty over exactly which species evolved into the modern great white and multiple gaps in the fossil record, paleontologists were able to chart the hypothetical lineage back to a 60-million-year-old shark known as Cretalamna as the common ancestor of all sharks within the Lamnidae.[28][30]

Illustrated evolution from C. hastalis to C. carcharias

However, it is now understood that the great white shark holds closer ties to the mako sharks and is descended from a separate lineage as a chronospecies unrelated to the mega-toothed sharks.[29] This was proven with the discovery of a transitional species that connected the great white to an unserrated shark known as Carcharodon hastalis.[34][35] This transitional species, which was named Carcharodon hubbelli in 2012, demonstrated a mosaic of evolutionary transitions between the great white and C. hastalis, namely the gradual appearance of serrations,[34] in a span of between 8 and 5 million years ago.[36] The progression of C. hubbelli characterized shifting diets and niches; by 6.5 million years ago, the serrations were developed enough for C. hubbelli to handle marine mammals.[34] Although both the great white and C. hastalis were known worldwide,[29] C. hubbelli is primarily found in California, Peru, Chile, and surrounding coastal deposits,[37] indicating that the great white had Pacific origins.[34] C. hastalis continued to thrive alongside the great white until its last appearance around one million years ago[38] and is believed to have possibly sired a number of additional species, including Carcharodon subserratus[29][34] and Carcharodon plicatilis.[29]

However, Yun argued that the tooth fossil remains of C. hastalis and Great White Shark "have been documented from the same deposits, hence the former cannot be a chronospecific ancestor of the latter." He also criticized that the C. hastalis "morphotype has never been tested through phylogenetic analyses," and denoted that as of 2021, the argument that the modern Carcharodon lineage with narrow, serrated teeth evolved from C. hastalis with a broad, unserrated teeth is uncertain.[39]

Tracing beyond C. hastalis, another prevailing hypothesis proposes that the great white and mako lineages shared a common ancestor in a primitive mako-like species.[40] The identity of this ancestor is still debated, but a potential species includes Isurolamna inflata, which lived between 65 and 55 million years ago. It is hypothesized that the great white and mako lineages split with the rise of two separate descendants, the one representing the great white shark lineage being Macrorhizodus praecursor.[40][41]

Distribution and habitat

Great white sharks live in almost all coastal and offshore waters which have water temperature between 12 and 24 °C (54 and 75 °F), with greater concentrations in the United States (Northeast and California), South Africa, Japan, Oceania, Chile, and the Mediterranean including the Sea of Marmara and Bosphorus.[42][43] One of the densest-known populations is found around Dyer Island, South Africa.[44] Juvenile great white sharks inhabit a more narrow band of temperatures, between 14 and 24 °C (57 and 75 °F), in shallow coastal nurseries.[45] Increased observation of young sharks in areas they were not previously common, such as Monterey Bay on the Central California coast, suggest climate change may be reducing the range of juvenile great white sharks and shifting it toward the poles.[46]

The great white is an epipelagic fish, observed mostly in the presence of rich game, such as fur seals (Arctocephalus ssp.), sea lions, cetaceans, other sharks, and large bony fish species. In the open ocean, it has been recorded at depths as great as 1,200 m (3,900 ft).[10] These findings challenge the traditional notion that the great white is a coastal species.[10]

According to a recent study, California great whites have migrated to an area between Baja California Peninsula and Hawaii known as the White Shark Café to spend at least 100 days before migrating back to Baja. On the journey out, they swim slowly and dive down to around 900 m (3,000 ft). After they arrive, they change behaviour and do short dives to about 300 m (980 ft) for up to ten minutes. Another white shark that was tagged off the South African coast swam to the southern coast of Australia and back within the year. A similar study tracked a different great white shark from South Africa swimming to Australia's northwestern coast and back, a journey of 20,000 km (12,000 mi; 11,000 nmi) in under nine months.[47] These observations argue against traditional theories that white sharks are coastal territorial predators, and open up the possibility of interaction between shark populations that were previously thought to have been discrete. The reasons for their migration and what they do at their destination is still unknown. Possibilities include seasonal feeding or mating.[48]

In the Northwest Atlantic, the white shark populations off the New England coast were nearly eradicated due to over-fishing.[49] In recent years, the populations have grown greatly,[50] largely due to the increase in seal populations on Cape Cod, Massachusetts since the enactment of the Marine Mammal Protection Act in 1972.[51] Currently very little is known about the hunting and movement patterns of great whites off Cape Cod, but ongoing studies hope to offer insight into this growing shark population.[52] The Massachusetts Division of Marine Fisheries (part of the Department of Fish and Game) began a population study in 2014; since 2019, this research has focused on how humans can avoid conflict with sharks.[53]

A 2018 study indicated that white sharks prefer to congregate deep in anticyclonic eddies in the North Atlantic Ocean. The sharks studied tended to favour the warm-water eddies, spending the daytime hours at 450 meters and coming to the surface at night.[54]

Anatomy and appearance

Upper teeth
Lower teeth
Great white shark's skeleton

The great white shark has a robust, large, conical snout. The upper and lower lobes on the tail fin are approximately the same size which is similar to some mackerel sharks. A great white displays countershading, by having a white underside and a grey dorsal area (sometimes in a brown or blue shade) that gives an overall mottled appearance. The coloration makes it difficult for prey to spot the shark because it breaks up the shark's outline when seen from the side. From above, the darker shade blends with the sea and from below it exposes a minimal silhouette against the sunlight. Leucism is extremely rare in this species, but has been documented in one great white shark (a pup that washed ashore in Australia and died).[55] Great white sharks, like many other sharks, have rows of serrated teeth behind the main ones, ready to replace any that break off. When the shark bites, it shakes its head side-to-side, helping the teeth saw off large chunks of flesh.[56] Great white sharks, like other mackerel sharks, have larger eyes than other shark species in proportion to their body size. The iris of the eye is a deep blue instead of black.[57]

Size

Specimen caught off Cuba in 1945 which was allegedly 6.4 m (21 ft) long and weighed an estimated 3,175–3,324 kg (7,000–7,328 lb).[58][59] Later studies proved this specimen to be in the normal size range, at around 4.9 m (16 ft) in length.[4]

In great white sharks, sexual dimorphism is present, and females are generally larger than males. Male great whites on average measure 3.4 to 4.0 m (11 to 13 ft) in length, while females measure 4.6 to 4.9 m (15 to 16 ft).[5] Adults of this species weigh 522–771 kg (1,151–1,700 lb) on average;[60] however, mature females can have an average mass of 680–1,110 kg (1,500–2,450 lb).[4] The largest females have been verified up to 6.1 m (20 ft) in length and an estimated 1,905 kg (4,200 lb) in weight,[4] perhaps up to 2,268 kg (5,000 lb).[61] The maximum size is subject to debate because some reports are rough estimations or speculations performed under questionable circumstances.[62] Among living cartilaginous fish, only the whale shark (Rhincodon typus), the basking shark (Cetorhinus maximus) and the giant manta ray (Manta birostris), in that order, are on average larger and heavier. These three species are generally quite docile in disposition and given to passively filter-feeding on very small organisms.[60] This makes the great white shark the largest extant macropredatory fish. Great white sharks measure approximately 1.2 m (3.9 ft) when born, and grow about 25 cm (9.8 in) every year.[63]

A complete female great white shark specimen in the Museum of Zoology in Lausanne, and claimed by De Maddalena et al. (2003) as the largest preserved specimen, measured 5.83 m (19.1 ft) in total body length with the caudal fin in its depressed position, and is estimated to have weighed 2,000 kg (4,410 lb).[3] According to J. E. Randall, the largest white shark reliably measured was a 5.94 m (19.5 ft) specimen reported from Ledge Point, Western Australia in 1987,[64] but it is unclear whether that length was measured with the caudal fin in its depressed or natural position.[3] Another great white specimen of similar size was a female caught in August 1988 in the Gulf of St. Lawrence, off Prince Edward Island, by David McKendrick of Alberton, Prince Edward Island. This female great white was 6.1 m (20 ft) long, as verified by the Canadian Shark Research Center.[4]

A report of a specimen reportedly measuring 6.4 m (21 ft) in length and with a body mass estimated at 3,175–3,324 kg (7,000–7,328 lb)[58][59][65] caught in 1945 off the coast of Cuba was at the time considered reliable by some experts.[59][66][65][67] However, later studies revealed this particular specimen to be around 4.9 m (16 ft) in length, i.e. a specimen within the typical maximum size range.[4]

The largest great white recognized by the International Game Fish Association (IGFA) is one caught by Alf Dean in southern Australian waters in 1959, weighing 1,208 kg (2,663 lb).[62]

Examples of large unconfirmed great whites

A number of very large unconfirmed great white shark specimens have been recorded.[68] For decades, many ichthyological works, as well as the Guinness Book of World Records, listed two great white sharks as the largest individuals: In the 1870s, a 10.9 m (36 ft) great white captured in southern Australian waters, near Port Fairy, and an 11.3 m (37 ft) shark trapped in a herring weir in New Brunswick, Canada, in the 1930s. However, these measurements were not obtained in a rigorous, scientifically valid manner, and researchers have questioned the reliability of these measurements for a long time, noting they were much larger than any other accurately reported sighting. Later studies proved these doubts to be well-founded. This New Brunswick shark may have been a misidentified basking shark, as the two have similar body shapes. The question of the Port Fairy shark was settled in the 1970s when J. E. Randall examined the shark's jaws and "found that the Port Fairy shark was of the order of 5 m (16 ft) in length and suggested that a mistake had been made in the original record, in 1870, of the shark's length".[64]

Photo of large shark on shore surrounded by people
Great white shark caught off Hualien County, Taiwan, on 14 May 1997: It was reportedly (unconfirmed) almost 7 m (23 ft) in length with a mass of 2,500 kg (5,500 lb).[68]

While these measurements have not been confirmed, some great white sharks caught in modern times have been estimated to be more than 7 m (23 ft) long,[69] but these claims have received some criticism.[62][69] However, J. E. Randall believed that great white shark may have exceeded 6.1 m (20 ft) in length.[64] A great white shark was captured near Kangaroo Island in Australia on 1 April 1987. This shark was estimated to be more than 6.9 m (23 ft) long by Peter Resiley,[64][70] and has been designated as KANGA.[69] Another great white shark was caught in Malta by Alfredo Cutajar on 16 April 1987. This shark was also estimated to be around 7.13 m (23.4 ft) long by John Abela and has been designated as MALTA.[69][71] However, Cappo drew criticism because he used shark size estimation methods proposed by J. E. Randall to suggest that the KANGA specimen was 5.8–6.4 m (19–21 ft) long.[69] In a similar fashion, I. K. Fergusson also used shark size estimation methods proposed by J. E. Randall to suggest that the MALTA specimen was 5.3–5.7 m (17–19 ft) long.[69] However, photographic evidence suggested that these specimens were larger than the size estimations yielded through Randall's methods.[69] Thus, a team of scientists—H. F. Mollet, G. M. Cailliet, A. P. Klimley, D. A. Ebert, A. D. Testi, and L. J. V. Compagno—reviewed the cases of the KANGA and MALTA specimens in 1996 to resolve the dispute by conducting a comprehensive morphometric analysis of the remains of these sharks and re-examination of photographic evidence in an attempt to validate the original size estimations and their findings were consistent with them. The findings indicated that estimations by P. Resiley and J. Abela are reasonable and could not be ruled out.[69] A particularly large female great white nicknamed "Deep Blue", estimated measuring at 6.1 m (20 ft) was filmed off Guadalupe during shooting for the 2014 episode of Shark Week "Jaws Strikes Back". Deep Blue would also later gain significant attention when she was filmed interacting with researcher Mauricio Hoyas Pallida in a viral video that Mauricio posted on Facebook on 11 June 2015.[72] Deep Blue was later seen off Oahu in January 2019 while scavenging a sperm whale carcass, whereupon she was filmed swimming beside divers including dive tourism operator and model Ocean Ramsey in open water.[73][74][75] A particularly infamous great white shark, supposedly of record proportions, once patrolled the area that comprises False Bay, South Africa, was said to be well over 7 m (23 ft) during the early 1980s. This shark, known locally as the "Submarine", had a legendary reputation that was supposedly well-founded. Though rumours have stated this shark was exaggerated in size or non-existent altogether, witness accounts by the then young Craig Anthony Ferreira, a notable shark expert in South Africa, and his father indicate an unusually large animal of considerable size and power (though it remains uncertain just how massive the shark was as it escaped capture each time it was hooked). Ferreira describes the four encounters with the giant shark he participated in with great detail in his book "Great White Sharks On Their Best Behavior".[76]

One contender in maximum size among the predatory sharks is the tiger shark (Galeocerdo cuvier). While tiger sharks, which are typically both a few feet smaller and have a leaner, less heavy body structure than white sharks, have been confirmed to reach at least 5.5 m (18 ft) in the length, an unverified specimen was reported to have measured 7.4 m (24 ft) in length and weighed 3,110 kg (6,860 lb), more than two times heavier than the largest confirmed specimen at 1,524 kg (3,360 lb).[60][77][78] Some other macropredatory sharks such as the Greenland shark (Somniosus microcephalus) and the Pacific sleeper shark (S. pacificus) are also reported to rival these sharks in length (but probably weigh a bit less since they are more slender in build than a great white) in exceptional cases.[79][80]

Reported sizes

Adaptations

Photo of shark swimming at water surface
A great white shark swimming

Great white sharks, like all other sharks, have an extra sense given by the ampullae of Lorenzini which enables them to detect the electromagnetic field emitted by the movement of living animals. Great whites are so sensitive they can detect variations of half a billionth of a volt. At close range, this allows the shark to locate even immobile animals by detecting their heartbeat.[98] Most fish have a less-developed but similar sense using their body's lateral line.[99]

Shark biting into the fish head teaser bait next to a cage in False Bay, South Africa

To more successfully hunt fast and agile prey such as sea lions, the great white has adapted to maintain a body temperature warmer than the surrounding water. One of these adaptations is a "rete mirabile" (Latin for "wonderful net"). This close web-like structure of veins and arteries, located along each lateral side of the shark, conserves heat by warming the cooler arterial blood with the venous blood that has been warmed by the working muscles. This keeps certain parts of the body (particularly the stomach) at temperatures up to 14 °C (25 °F) [100] above that of the surrounding water, while the heart and gills remain at sea temperature. When conserving energy, the core body temperature can drop to match the surroundings. A great white shark's success in raising its core temperature is an example of gigantothermy. Therefore, the great white shark can be considered an endothermic poikilotherm or mesotherm because its body temperature is not constant but is internally regulated.[56][101] Great whites also rely on the fat and oils stored within their livers for long-distance migrations across nutrient-poor areas of the oceans.[102] Studies by Stanford University and the Monterey Bay Aquarium published on 17 July 2013 revealed that in addition to controlling the sharks' buoyancy, the liver of great whites is essential in migration patterns. Sharks that sink faster during drift dives were revealed to use up their internal stores of energy quicker than those which sink in a dive at more leisurely rates.[103]

Toxicity from heavy metals seems to have little negative effects on great white sharks. Blood samples taken from forty-three individuals of varying size, age and sex off the South African coast led by biologists from the University of Miami in 2012 indicates that despite high levels of mercury, lead, and arsenic, there was no sign of raised white blood cell count and granulate to lymphocyte ratios, indicating the sharks had healthy immune systems. This discovery suggests a previously unknown physiological defence against heavy metal poisoning. Great whites are known to have a propensity for "self-healing and avoiding age-related ailments".[104]

Bite force

A 2007 study from the University of New South Wales in Sydney, Australia, used CT scans of a shark's skull and computer models to measure the shark's maximum bite force. The study reveals the forces and behaviours its skull is adapted to handle and resolves competing theories about its feeding behaviour.[105] In 2008, a team of scientists led by Stephen Wroe conducted an experiment to determine the great white shark's jaw power and findings indicated that a specimen massing 3,324 kg (7,328 lb) could exert a bite force of 18,216 newtons (4,095 lbf).[65]

Ecology and behaviour

Photo of inverted shark at surface
A shark turns onto its back while hunting tuna bait

This shark's behaviour and social structure are complex.[106] In South Africa, white sharks have a dominance hierarchy depending on the size, sex and squatter's rights: Females dominate males, larger sharks dominate smaller sharks, and residents dominate newcomers. When hunting, great whites tend to separate and resolve conflicts with rituals and displays. White sharks rarely resort to combat although some individuals have been found with bite marks that match those of other white sharks. This suggests that when a great white approaches too closely to another, they react with a warning bite. Another possibility is that white sharks bite to show their dominance. Data acquired from animal-borne telemetry receivers and published in 2022 via the journal Royal Society Publishing suggests that individual great whites may associate so that they can inadvertently share information on the whereabouts of prey or the location of the remains of animals that can be scavenged. As biologging can help to reveal social habits, it allows a better understanding to be made in future studies regarding the full extent of social interactions in large marine animals, including the great white shark.[107]

The great white shark is one of only a few sharks known to regularly lift its head above the sea surface to gaze at other objects such as prey. This is known as spy-hopping. This behaviour has also been seen in at least one group of blacktip reef sharks, but this might be learned from interaction with humans (it is theorized that the shark may also be able to smell better this way because smell travels through air faster than through water). White sharks are generally very curious animals, display intelligence and may also turn to socializing if the situation demands it. At Seal Island, white sharks have been observed arriving and departing in stable "clans" of two to six individuals on a yearly basis. Whether clan members are related is unknown, but they get along peacefully enough. In fact, the social structure of a clan is probably most aptly compared to that of a wolf pack, in that each member has a clearly established rank and each clan has an alpha leader. When members of different clans meet, they establish social rank nonviolently through any of a variety of interactions.[108] In 2022, research in South Africa suggested that the great white shark has the ability to change colours to camouflage itself depending on the hormones it gives off. Different hormones would change the colour of the skin from white to grey. Skin dosed with adrenaline would turn lighter, with melanocyte-stimulating hormone causing melanocyte cells to dissipate thus making the shark's skin a darker colour, although hormone mediated color change is not fully validated due to the limited number of test subjects (i.e. great whites).[109] The camo shark hypothesis is supported by the fact that zebra sharks can change their colour as they age, and rainbow sharks can lose colour due to stress and aging.[110]

Diet

A beachcomber looking at bite marks from a great white shark on a beached whale carcass

Great white sharks are carnivorous and prey upon fish (e.g. tuna, rays, other sharks),[108] cetaceans (i.e., dolphins, porpoises, whales), pinnipeds (e.g. seals, fur seals,[108] and sea lions), sea turtles,[108] sea otters (Enhydra lutris) and seabirds.[111] Great whites have also been known to eat objects that they are unable to digest. Juvenile white sharks predominantly prey on fish, including other elasmobranchs, as their jaws are not strong enough to withstand the forces required to attack larger prey such as pinnipeds and cetaceans until they reach a length of 3 m (9.8 ft) or more, at which point their jaw cartilage mineralizes enough to withstand the impact of biting into larger prey species.[112] Upon approaching a length of nearly 4 m (13 ft), great white sharks begin to target predominantly marine mammals for food, though individual sharks seem to specialize in different types of prey depending on their preferences.[113][114] They seem to be highly opportunistic.[115][116] These sharks prefer prey with a high content of energy-rich fat. Shark expert Peter Klimley used a rod-and-reel rig and trolled carcasses of a seal, a pig, and a sheep from his boat in the South Farallons. The sharks attacked all three baits but rejected the sheep carcass.[117]

Off Seal Island, False Bay in South Africa, the sharks ambush brown fur seals (Arctocephalus pusillus) from below at high speeds, hitting the seal mid-body. They achieve high speeds that allow them to completely breach the surface of the water. The peak burst speed is estimated to be above 40 km/h (25 mph).[118] They have also been observed chasing prey after a missed attack. Prey is usually attacked at the surface.[119] Shark attacks occur most often in the morning, within two hours of sunrise, when visibility is poor. Their success rate is 55% in the first two hours, falling to 40% in late morning after which hunting stops.[108]

Off California, sharks immobilize northern elephant seals (Mirounga angustirostris) with a large bite to the hindquarters (which is the main source of the seal's mobility) and wait for the seal to bleed to death. This technique is especially used on adult male elephant seals, which are typically larger than the shark, ranging between 1,500 and 2,000 kg (3,300 and 4,400 lb), and are potentially dangerous adversaries.[120][121] Most commonly though, juvenile elephant seals are the most frequently eaten at elephant seal colonies.[122] Prey is normally attacked sub-surface. Harbor seals (Phoca vitulina) are taken from the surface and dragged down until they stop struggling. They are then eaten near the bottom. California sea lions (Zalophus californianus) are ambushed from below and struck mid-body before being dragged and eaten.[123]

Great white shark near Gansbaai, showing upper and lower teeth

In the Northwest Atlantic mature great whites are known to feed on both harbor and grey seals.[51] Unlike adults, juvenile white sharks in the area feed on smaller fish species until they are large enough to prey on marine mammals such as seals.[124]

White sharks also attack dolphins and porpoises from above, behind or below to avoid being detected by their echolocation. Targeted species include dusky dolphins (Sagmatias obscurus),[69] Risso's dolphins (Grampus griseus),[69] bottlenose dolphins (Tursiops ssp.),[69][125] humpback dolphins (Sousa ssp.),[125] harbour porpoises (Phocoena phocoena),[69] and Dall's porpoises (Phocoenoides dalli).[69] Groups of dolphins have occasionally been observed defending themselves from sharks with mobbing behaviour.[125] White shark predation on other species of small cetacean has also been observed. In August 1989, a 1.8 m (5.9 ft) juvenile male pygmy sperm whale (Kogia breviceps) was found stranded in central California with a bite mark on its caudal peduncle from a great white shark.[126] In addition, white sharks attack and prey upon beaked whales.[69][125] Cases where an adult Stejneger's beaked whale (Mesoplodon stejnegeri), with a mean mass of around 1,100 kg (2,400 lb),[127] and a juvenile Cuvier's beaked whale (Ziphius cavirostris), an individual estimated at 3 m (9.8 ft), were hunted and killed by great white sharks have also been observed.[128] When hunting sea turtles, they appear to simply bite through the carapace around a flipper, immobilizing the turtle. The heaviest species of bony fish, the oceanic sunfish (Mola mola), has been found in great white shark stomachs.[115]

Whale carcasses comprise an important part of the diet of white sharks. However, this has rarely been observed due to whales dying in remote areas. It has been estimated that 30 kg (66 lb) of whale blubber could feed a 4.5 m (15 ft) white shark for 1.5 months. Detailed observations were made of four whale carcasses in False Bay between 2000 and 2010. Sharks were drawn to the carcass by chemical and odour detection, spread by strong winds. After initially feeding on the whale caudal peduncle and fluke, the sharks would investigate the carcass by slowly swimming around it and mouthing several parts before selecting a blubber-rich area. During feeding bouts of 15–20 seconds the sharks removed flesh with lateral headshakes, without the protective ocular rotation they employ when attacking live prey. The sharks were frequently observed regurgitating chunks of blubber and immediately returning to feed, possibly in order to replace low energy yield pieces with high energy yield pieces, using their teeth as mechanoreceptors to distinguish them. After feeding for several hours, the sharks appeared to become lethargic, no longer swimming to the surface; they were observed mouthing the carcass but apparently unable to bite hard enough to remove flesh, they would instead bounce off and slowly sink. Up to eight sharks were observed feeding simultaneously, bumping into each other without showing any signs of aggression; on one occasion a shark accidentally bit the head of a neighbouring shark, leaving two teeth embedded, but both continued to feed unperturbed. Smaller individuals hovered around the carcass eating chunks that drifted away. Unusually for the area, large numbers of sharks over five metres long were observed, suggesting that the largest sharks change their behaviour to search for whales as they lose the manoeuvrability required to hunt seals. The investigating team concluded that the importance of whale carcasses, particularly for the largest white sharks, has been underestimated.[129]

A shark scavenging on a whale carcass in False Bay, South Africa

In another documented incident, white sharks were observed scavenging on a whale carcass alongside tiger sharks.[130] In 2020, marine biologists Sasha Dines and Enrico Gennari published a documented incident in the journal Marine and Freshwater Research of a group of great white sharks exhibiting pack-like behaviour, successfully attacking and killing a live juvenile 7 m (23 ft) humpback whale. The sharks utilized the classic attack strategy used on pinnipeds when attacking the whale, even utilizing the bite-and-spit tactic they employ on smaller prey items. The whale was an entangled individual, heavily emaciated and thus more vulnerable to the sharks' attacks. The incident is the first known documentation of great whites actively killing a large baleen whale.[131][132] A second incident regarding great white sharks killing humpback whales involving a single large female great white nicknamed Helen was documented off the coast of South Africa. Working alone, the shark attacked a 33 ft (10 m) emaciated and entangled humpback whale by attacking the whale's tail to cripple it before she managed to drown the whale by biting onto its head and pulling it underwater. The attack was witnessed via aerial drone by marine biologist Ryan Johnson, who said the attack went on for roughly 50 minutes before the shark successfully killed the whale. Johnson suggested that the shark may have strategized its attack in order to kill such a large animal.[133][134]

Stomach contents of great whites also indicates that whale sharks both juvenile and adult may also be included on the animal's menu, though whether this is active hunting or scavenging is not known at present.[135][136]

Reproduction

Great white sharks were previously thought to reach sexual maturity at around 15 years of age, but are now believed to take far longer; male great white sharks reach sexual maturity at age 26, while females take 33 years to reach sexual maturity.[8][137][138] Maximum life span was originally believed to be more than 30 years, but a study by the Woods Hole Oceanographic Institution placed it at upwards of 70 years. Examinations of vertebral growth ring count gave a maximum male age of 73 years and a maximum female age of 40 years for the specimens studied. The shark's late sexual maturity, low reproductive rate, long gestation period of 11 months and slow growth make it vulnerable to pressures such as overfishing and environmental change.[7]

Little is known about the great white shark's mating habits, and mating behaviour had not been observed in this species until 1997 and properly documented in 2020. It was assumed previously to be possible that whale carcasses are an important location for sexually mature sharks to meet for mating.[129] According to the testimony of fisherman Dick Ledgerwood, who observed two great white sharks mating in the area near Port Chalmers and Otago Harbor, in New Zealand, it is theorized that great white sharks mate in shallow water away from feeding areas and continually roll belly to belly during copulation.[139] Birth has never been observed, but pregnant females have been examined. Great white sharks are ovoviviparous, which means eggs develop and hatch in the uterus and continue to develop until birth.[140] The great white has an 11-month gestation period. The shark pup's powerful jaws begin to develop in the first month. The unborn sharks participate in oophagy, in which they feed on ova produced by the mother. Delivery is in spring and summer.[141] The largest number of pups recorded for this species is 14 pups from a single mother measuring 4.5 m (15 ft) that was killed incidentally off Taiwan in 2019.[142]

Breaching behaviour

Great white shark breaching near Gansbaai in South Africa

A breach is the result of a high-speed approach to the surface with the resulting momentum taking the shark partially or completely clear of the water. This is a hunting technique employed by great white sharks whilst hunting seals. This technique is often used on cape fur seals at Seal Island in False Bay, South Africa. Because the behaviour is unpredictable, it is very hard to document. It was first photographed by Chris Fallows and Rob Lawrence who developed the technique of towing a slow-moving seal decoy to trick the sharks to breach.[143] Between April and September, scientists may observe around 600 breaches. The seals swim on the surface and the great white sharks launch their predatory attack from the deeper water below. They can reach speeds of up to 40 km/h (25 mph) and can at times launch themselves more than 3 m (10 ft) into the air. Just under half of observed breach attacks are successful.[144] In 2011, a 3-m-long shark jumped onto a seven-person research vessel off Seal Island in Mossel Bay. The crew were undertaking a population study using sardines as bait, and the incident was judged not to be an attack on the boat but an accident.[145]

Natural threats

Comparison of the size of an average orca and an average great white shark

Interspecific competition between the great white shark and the orca is probable in regions where dietary preferences of both species may overlap.[125] An incident was documented on 4 October 1997, in the Farallon Islands off California in the United States. An estimated 4.7–5.3 m (15–17 ft) female orca immobilized an estimated 3–4 m (9.8–13.1 ft) great white shark.[146] The orca held the shark upside down to induce tonic immobility and kept the shark still for fifteen minutes, causing it to suffocate. The orca then proceeded to eat the dead shark's liver.[125][146][147] It is believed that the scent of the slain shark's carcass caused all the great whites in the region to flee, forfeiting an opportunity for a great seasonal feed. Another similar attack apparently occurred there in 2000, but its outcome is not clear.[148] After both attacks, the local population of about 100 great whites vanished.[147][148] Following the 2000 incident, a great white with a satellite tag was found to have immediately submerged to a depth of 500 m (1,600 ft) and swum to Hawaii.[148]

In 2015, a pod of orcas was recorded to have killed a great white shark off South Australia.[149] In 2017, three great whites were found washed ashore near Gansbaai, South Africa, with their body cavities torn open and the livers removed by what is likely to have been orcas.[150] Orcas also generally impact great white distribution. Studies published in 2019 of orca and great white shark distribution and interactions around the Farallon Islands indicate that the cetaceans impact the sharks negatively, with brief appearances by orcas causing the sharks to seek out new feeding areas until the next season.[151] It is unclear whether this is an example of competitive exclusion or ecology of fear. Occasionally, however, some great whites have been seen to swim near orcas without fear.[152]

Relationship with humans

Shark bite incidents

Of all shark species, the great white shark is responsible for by far the largest number of recorded shark bite incidents on humans, with 272 documented unprovoked bite incidents on humans as of 2012.[17]

More than any documented bite incident, Peter Benchley's best-selling novel Jaws and the subsequent 1975 film adaptation directed by Steven Spielberg provided the great white shark with the image of being a "man-eater" in the public mind.[153] While great white sharks have killed humans in at least 74 documented unprovoked bite incidents, they typically do not target them: for example, in the Mediterranean Sea there have been 31 confirmed bite incidents against humans in the last two centuries, most of which were non-fatal. Many of the incidents seemed to be "test-bites". Great white sharks also test-bite buoys, flotsam, and other unfamiliar objects, and they might grab a human or a surfboard to identify what it is.

Photo of open-mouthed shark at surface.
The great white shark is one of only four kinds of shark that have been involved in a significant number of fatal unprovoked attacks on humans.

Many bite incidents occur in waters with low visibility or other situations which impair the shark's senses. The species appears to not like the taste of humans, or at least finds the taste unfamiliar. Further research shows that they can tell in one bite whether or not the object is worth predating upon. Humans, for the most part, are too bony for their liking. They much prefer seals, which are fat and rich in protein.[154]

Studies published in 2021 by Ryan et al. in the Journal of the Royal Society Interface suggest that mistaken identity is in fact a case for many shark bite incidents perpetrated by great white sharks. Using cameras and footage of seals in aquariums as models and mounted cameras moving at the same speed and angle as a cruising great white shark looking up at the surface from below, the experiment suggests that the sharks are likely colorblind and cannot see in fine enough detail to determine whether the silhouette above them is a pinniped or a swimming human, potentially vindicating the hypothesis.[155]

Humans are not appropriate prey because the shark's digestion is too slow to cope with a human's high ratio of bone to muscle and fat. Accordingly, in most recorded shark bite incidents, great whites broke off contact after the first bite. Fatalities are usually caused by blood loss from the initial bite rather than from critical organ loss or from whole consumption. From 1990 to 2011 there have been a total of 139 unprovoked great white shark bite incidents, 29 of which were fatal.[156]

However, some researchers have hypothesized that the reason the proportion of fatalities is low is not that sharks do not like human flesh, but because humans are often able to escape after the first bite. In the 1980s, John McCosker, chair of aquatic biology at the California Academy of Sciences, noted that divers who dived solo and were bitten by great whites were generally at least partially consumed, while divers who followed the buddy system were generally rescued by their companion. McCosker and Timothy C. Tricas, an author and professor at the University of Hawaii, suggest that a standard pattern for great whites is to make an initial devastating attack and then wait for the prey to weaken before consuming the wounded animal. Humans' ability to move out of reach with the help of others, thus foiling the attack, is unusual for a great white's prey.[157]

Shark culling

A beached baby white shark

Shark culling is the deliberate killing of sharks by a government in an attempt to reduce shark attacks; shark culling is often called "shark control".[158] These programs have been criticized by environmentalists and scientists—they say these programs harm the marine ecosystem; they also say such programs are "outdated, cruel, and ineffective".[159] Many different species (dolphins, turtles, etc.) are also killed in these programs (because of their use of shark nets and drum lines)—15,135 marine animals were killed in New South Wales' nets between 1950 and 2008,[158] and 84,000 marine animals were killed by Queensland authorities from 1962 to 2015.[160]

Great white sharks are currently killed in both Queensland and New South Wales in "shark control" (shark culling) programs.[158] Queensland uses shark nets and drum lines with baited hooks, while New South Wales only uses nets. From 1962 to 2018, Queensland authorities killed about 50,000 sharks, many of which were great whites.[161] From 2013 to 2014 alone, 667 sharks were killed by Queensland authorities, including great white sharks.[158] In Queensland, great white sharks found alive on the drum lines are shot.[162] In New South Wales, between 1950 and 2008, a total of 577 great white sharks were killed in nets.[158] Between September 2017 and April 2018, fourteen great white sharks were killed in New South Wales.[163]

KwaZulu-Natal (an area of South Africa) also has a "shark control" program that kills great white sharks and other marine life. In a 30-year period, more than 33,000 sharks were killed in KwaZulu-Natal's shark-killing program, including great whites.[164]

In 2014 the state government of Western Australia led by Premier Colin Barnett implemented a policy of killing large sharks. The policy, colloquially referred to as the Western Australian shark cull, was intended to protect users of the marine environment from shark bite incidents, following the deaths of seven people on the Western Australian coastline in the years 2010–2013.[165] Baited drum lines were deployed near popular beaches using hooks designed to catch great white sharks, as well as bull and tiger sharks. Large sharks found hooked but still alive were shot and their bodies discarded at sea.[166] The government claimed they were not culling the sharks, but were using a "targeted, localised, hazard mitigation strategy".[167] Barnett described opposition as "ludicrous" and "extreme", and said that nothing could change his mind.[168] This policy was met with widespread condemnation from the scientific community, which showed that species responsible for bite incidents were notoriously hard to identify, that the drum lines failed to capture white sharks, as intended, and that the government also failed to show any correlation between their drum line policy and a decrease in shark bite incidents in the region.[169]

Attacks on boats

Great white sharks infrequently bite and sometimes even sink boats. Only five of the 108 authenticated unprovoked shark bite incidents reported from the Pacific Coast during the 20th century involved kayakers.[170] In a few cases they have bitten boats up to 10 m (33 ft) in length. They have bumped or knocked people overboard, usually biting the boat from the stern. In one case in 1936, a large shark leapt completely into the South African fishing boat Lucky Jim, knocking a crewman into the sea. Tricas and McCosker's underwater observations suggest that sharks are attracted to boats by the electrical fields they generate, which are picked up by the ampullae of Lorenzini and confuse the shark about whether or not wounded prey might be nearby.[171]

In captivity

Photo of shark
Great white shark in the Monterey Bay Aquarium in September 2006

Prior to August 1981, no great white shark in captivity lived longer than 11 days. In August 1981, a great white survived for 16 days at SeaWorld San Diego before being released.[172] The idea of containing a live great white at SeaWorld Orlando was used in the 1983 film Jaws 3-D.

Monterey Bay Aquarium first attempted to display a great white in 1984, but the shark died after 11 days because it did not eat.[173] In July 2003, Monterey researchers captured a small female and kept it in a large netted pen near Malibu for five days. They had the rare success of getting the shark to feed in captivity before its release.[174] Not until September 2004 was the aquarium able to place a great white on long-term exhibit. A young female, which was caught off the coast of Ventura, was kept in the aquarium's 3.8 million L (1 million US gal) Outer Bay exhibit for 198 days before she was released in March 2005. She was tracked for 30 days after release.[175] On the evening of 31 August 2006, the aquarium introduced a juvenile male caught outside Santa Monica Bay.[176] His first meal as a captive was a large salmon steak on 8 September 2006, and as of that date, he was estimated to be 1.72 m (68 in) in length and to weigh approximately 47 kg (104 lb). He was released on 16 January 2007, after 137 days in captivity.

Monterey Bay Aquarium housed a third great white, a juvenile male, for 162 days between 27 August 2007, and 5 February 2008. On arrival, he was 1.4 m (4.6 ft) long and weighed 30.6 kg (67 lb). He grew to 1.8 m (5.9 ft) and 64 kg (141 lb) before release. A juvenile female came to the Outer Bay Exhibit on 27 August 2008. While she did swim well, the shark fed only once during her stay and was tagged and released on 7 September 2008. Another juvenile female was captured near Malibu on 12 August 2009, introduced to the Outer Bay exhibit on 26 August 2009, and was successfully released into the wild on 4 November 2009.[177] The Monterey Bay Aquarium introduced a 1.4-m-long male into their redesigned "Open Sea" exhibit on 31 August 2011. He was exhibited for 55 days, and was released into the wild on the 25th of October the same year. However, the shark was determined to have died shortly after release via an attached electronic tag. The cause of death is not known.[178][179][180]

The Monterey Bay Aquarium does not plan to exhibit any more great whites, as the main purpose of containing them was scientific. As data from captive great whites were no longer needed, the institute has instead shifted its focus to study wild sharks.[181]

One of the largest adult great whites ever exhibited was at Japan's Okinawa Churaumi Aquarium in 2016, where a 3.5 m (11 ft) male was exhibited for three days before dying.[182][183] Perhaps the most famous captive was a 2.4 m (7.9 ft) female named Sandy, which in August 1980 became the only great white to be housed at the California Academy of Sciences' Steinhart Aquarium in San Francisco, California. She was released because she would not eat and constantly bumped against the walls.[184]

Due to the vast amounts of resources required and the subsequent cost to keep a great white shark alive in captivity, their dietary preferences, size, migratory nature, and the stress of capture and containment, permanent exhibition of a great white shark is likely to be unfeasible.[185]

Shark tourism

Cage diving is most common at sites where great whites are frequent including the coast of South Africa, the Neptune Islands in South Australia,[186] and Guadalupe Island in Baja California. The popularity of cage diving and swimming with sharks is at the focus of a booming tourist industry.[187][188] A common practice is to chum the water with pieces of fish to attract the sharks. These practices may make sharks more accustomed to people in their environment and to associate human activity with food; a potentially dangerous situation. By drawing bait on a wire towards the cage, tour operators lure the shark to the cage, possibly striking it, exacerbating this problem. Other operators draw the bait away from the cage, causing the shark to swim past the divers.

At present, hang baits are illegal off Isla Guadalupe and reputable dive operators do not use them. Operators in South Africa and Australia continue to use hang baits and pinniped decoys.[189] In South Australia, playing rock music recordings underwater, including the AC/DC album Back in Black has also been used experimentally to attract sharks.[190]

Companies object to being blamed for shark bite incidents, pointing out that lightning tends to strike humans more often than sharks bite humans.[191] Their position is that further research needs to be done before banning practices such as chumming, which may alter natural behaviour.[192] One compromise is to only use chum in areas where whites actively patrol anyway, well away from human leisure areas. Also, responsible dive operators do not feed sharks. Only sharks that are willing to scavenge follow the chum trail and if they find no food at the end then the shark soon swims off and does not associate chum with a meal. It has been suggested that government licensing strategies may help enforce these responsible tourism.[189]

Conservation status

It is unclear how much of a concurrent increase in fishing for great white sharks has caused the decline of great white shark populations from the 1970s to the present. No accurate global population numbers are available, but the great white shark is now considered vulnerable.[1] Sharks taken during the long interval between birth and sexual maturity never reproduce, making population recovery and growth difficult.[8]

The International Union for Conservation of Nature notes that very little is known about the actual status of the great white shark, but as it appears uncommon compared to other widely distributed species, it is considered vulnerable.[1] It is included in Appendix II of CITES,[12] meaning that international trade in the species (including parts and derivatives) requires a permit.[193] As of March 2010, it has also been included in Annex I of the CMS Migratory Sharks MoU, which strives for increased international understanding and coordination for the protection of certain migratory sharks.[194] A February 2010 study by Barbara Block of Stanford University estimated the world population of great white sharks to be lower than 3,500 individuals, making the species more vulnerable to extinction than the tiger, whose population is in the same range.[195] According to another study from 2014 by George H. Burgess, Florida Museum of Natural History, University of Florida, there are about 2,000 great white sharks near the California coast, which is 10 times higher than the previous estimate of 219 by Barbara Block.[196][197]

Fishermen target many sharks for their jaws, teeth, and fins, and as game fish in general. The great white shark, however, is rarely an object of commercial fishing, although its flesh is considered valuable. If casually captured (it happens for example in some tonnare in the Mediterranean), it is misleadingly sold as smooth-hound shark.[198]

In Australia

The great white shark was declared vulnerable by the Australian Government in 1999 because of significant population decline and is currently protected under the Environmental Protection and Biodiversity Conservation (EPBC) Act.[199] The causes of decline prior to protection included mortality from sport fishing harvests as well as being caught in beach protection netting.[200]

The national conservation status of the great white shark is reflected by all Australian states under their respective laws, granting the species full protection throughout Australia regardless of jurisdiction.[199] Many states had prohibited the killing or possession of great white sharks prior to national legislation coming into effect. The great white shark is further listed as threatened in Victoria under the Flora and Fauna Guarantee Act, and as rare or likely to become extinct under Schedule 5 of the Wildlife Conservation Act in Western Australia.[199]

In 2002, the Australian government created the White Shark Recovery Plan, implementing government-mandated conservation research and monitoring for conservation in addition to federal protection and stronger regulation of shark-related trade and tourism activities.[200] An updated recovery plan was published in 2013 to review progress, research findings, and to implement further conservation actions.[13] A study in 2012 revealed that Australia's white shark population was separated by Bass Strait into genetically distinct eastern and western populations, indicating a need for the development of regional conservation strategies.[201]

Presently, human-caused shark mortality is continuing, primarily from accidental and illegal catching in commercial and recreational fishing as well as from being caught in beach protection netting, and the populations of great white shark in Australia are yet to recover.[13]

In spite of official protections in Australia, great white sharks continue to be killed in state "shark control" programs within Australia. For example, the government of Queensland has a "shark control" program (shark culling) which kills great white sharks (as well as other marine life) using shark nets and drum lines with baited hooks.[202][158] In Queensland, great white sharks that are found alive on the baited hooks are shot.[162] The government of New South Wales also kills great white sharks in its "shark control" program.[158] Partly because of these programs, shark numbers in eastern Australia have decreased.[161]

The Australasian population of great white sharks is believed to be in excess of 8,000–10,000 individuals according to genetic research studies done by CSIRO, with an adult population estimated to be around 2,210 individuals in both Eastern and Western Australia. The annual survival rate for juveniles in these two separate populations was estimated in the same study to be close to 73 percent, while adult sharks had a 93 percent annual survival rate. Whether or not mortality rates in great white sharks have declined, or the population has increased as a result of the protection of this species in Australian waters is as yet unknown due to the slow growth rates of this species.[203]

In New Zealand

The great white shark is one of the most commonly found in the waters of New Zealand.[204] As of April 2007, great white sharks were fully protected within 370 km (230 mi) of New Zealand and additionally from fishing by New Zealand-flagged boats outside this range. The maximum penalty is a $250,000 fine and up to six months in prison.[205] In June 2018 the New Zealand Department of Conservation classified the great white shark under the New Zealand Threat Classification System as "Nationally Endangered". The species meets the criteria for this classification as there exists a moderate, stable population of between 1000 and 5000 mature individuals. This classification has the qualifiers "Data Poor" and "Threatened Overseas".[206]

In North America

In 2013, great white sharks were added to California's Endangered Species Act. From data collected, the population of great whites in the North Pacific was estimated to be fewer than 340 individuals. Research also reveals these sharks are genetically distinct from other members of their species elsewhere in Africa, Australia, and the east coast of North America, having been isolated from other populations.[207]

A 2014 study estimated the population of great white sharks along the California coastline to be approximately 2,400.[208][209]

In 2015 Massachusetts banned catching, cage diving, feeding, towing decoys, or baiting and chumming for its significant and highly predictable migratory great white population without an appropriate research permit. The goal of these restrictions is to both protect the sharks and public health.[210]

See also

Books

Notes

  1. During Belon's time, sharks were called "sea dogs".[26]

References

  1. Rigby, C.L.; Barreto, R.; Carlson, J.; Fernando, D.; Fordham, S.; Francis, M.P.; Herman, K.; Jabado, R.W.; Liu, K.M.; Lowe, C.G.; Marshall, A.; Pacoureau, N.; Romanov, E.; Sherley, R.B.; Winker, H. (2019). "Carcharodon carcharias". IUCN Red List of Threatened Species. 2019: e.T3855A2878674. doi:10.2305/IUCN.UK.2019-3.RLTS.T3855A2878674.en. Retrieved 19 November 2021.
  2. "Great White Shark".
  3. De Maddalena, A.; Glaizot, O.; Oliver, G. (2003). "On the Great White Shark, Carcharodon carcharias (Linnaeus, 1758), preserved in the Museum of Zoology in Lausanne". Marine Life. 13 (1–2): 53–59. S2CID 163636286.
  4. Viegas, Jennifer. "Largest Great White Shark Don't Outweigh Whales, but They Hold Their Own". Discovery Channel. Archived from the original on 7 February 2010. Retrieved 19 January 2010.
  5. Parrish, M. "How Big are Great White Sharks?". Smithsonian National Museum of Natural History Ocean Portal. Retrieved 3 June 2016.
  6. "Carcharodon carcharias". Animal Diversity Web. Retrieved 5 June 2016.
  7. "New study finds extreme longevity in white sharks". Science Daily. 9 January 2014.
  8. Ghose, Tia (19 February 2015). "Great White Sharks Are Late Bloomers". LiveScience.com.
  9. Klimley, A. Peter; Le Boeuf, Burney J.; Cantara, Kelly M.; Richert, John E.; Davis, Scott F.; Van Sommeran, Sean; Kelly, John T. (19 March 2001). "The hunting strategy of white sharks (Carcharodon carcharias) near a seal colony". Marine Biology. 138 (3): 617–636. doi:10.1007/s002270000489. ISSN 0025-3162. S2CID 85018712.
  10. Thomas, Pete (5 April 2010). "Great white shark amazes scientists with 4,000-foot dive into abyss". GrindTV. Archived from the original on 17 August 2012.
  11. Currents of Contrast: Life in Southern Africa's Two Oceans. Struik. 2005. pp. 31–. ISBN 978-1-77007-086-8.
  12. "Carcharodon carcharias". UNEP-WCMC Species Database: CITES-Listed Species On the World Wide Web. Archived from the original on 16 June 2013. Retrieved 8 April 2010.
  13. Recovery Plan for the White Shark (Carcharodon carcharias) (Report). Government of Australia Department of Sustainability, Environment, Water, Population and Communities. 2013.
  14. Cronin, Melissa (10 January 2016). "Here's Why We've Never Been Able to Tame the Great White Shark".
  15. Hile, Jennifer (23 January 2004). "Great White Shark Attacks: Defanging the Myths". Marine Biology. National Geographic. Archived from the original on 26 April 2009. Retrieved 2 May 2010.
  16. "ISAF Statistics on Attacking Species of Shark". Florida Museum of Natural History University of Florida. Archived from the original on 24 April 2012. Retrieved 4 May 2008.
  17. "Species Implicated in Attacks". Florida Museum. 24 January 2018. Retrieved 6 February 2023.
  18. rice, doyle. "2020 was an 'unusually deadly year' for shark attacks, with the most deaths since 2013". usa today.
  19. "Carcharodon carcharias, Great white shark". FishBase.
  20. "Family Lamnidae - Mackerel sharks or white shark". FishBase.
  21. "Common names of Carcharodon carcharias". FishBase.
  22. Martins, C.; Knickle, C. (2018). "Carcharodon carcharias". Florida Museum.
  23. Martin, R. A. "White Shark or Great White Shark?". Elasmo Research.
  24. Linnaeus, C (1758). Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata (in Latin). Vol. 1. Holmiae (Laurentii Salvii). p. 235. doi:10.5962/bhl.title.542.
  25. Jordan, D. S. (1925). "The Generic Name of the Great White Shark, Squalus carcharias L.". Copeia. 140 (1925): 17–20. doi:10.2307/1435586. JSTOR 1435586.
  26. Costantino, G. (18 August 2014). "Sharks Were Once Called Sea Dogs, And Other Little-Known Facts". Smithsonain.com. Smithsonian Institution. Retrieved 18 May 2019.
  27. Human, B. A.; Owen, E. P.; Compagno, L. J. V.; Harley, E. H. (2006). "Testing morphologically based phylogenetic theories within the cartilaginous fishes with molecular data, with special reference to the catshark family (Chondrichthyes; Scyliorhinidae) and the interrelationships within them". Molecular Phylogenetics and Evolution. 39 (2006): 384–391. doi:10.1016/j.ympev.2005.09.009. PMID 16293425.
  28. Martin, A. P. (1996). "Systematics of the Lamnidae and the Origination Time of Carcharodon carcharias Inferred from the Comparative Analysis of Mitochondrial DNA Sequences". In Klimley, A. P.; Ainley, D. G. (eds.). Great White Sharks: The Biology of Carcharodon carcharias. Academic Press. pp. 49–53. doi:10.1016/B978-0-12-415031-7.X5000-9. ISBN 978-0-12-415031-7.
  29. Kent, B. W. (2018). "The Cartilaginous Fishes (Chimaeras, Sharks, and Rays) of Calvert Cliffs, Maryland, USA". In Godfrey, S. J. (ed.). The Geology and Vertebrate Paleontology of Calvert Cliffs, Maryland. pp. 45–157. doi:10.5479/si.1943-6688.100. ISSN 1943-6688. S2CID 134274604. {{cite book}}: |journal= ignored (help)
  30. Applegate, S. P.; Espinosa-Arrubarrena, L. (1996). "The Fossil History of Carcharodon and Its Possible Ancestor, Cretolamna: A Study in Tooth Identification". In Klimley, A. P.; Ainley, D. G. (eds.). Great White Sharks: The Biology of Carcharodon carcharias. Academic Press. pp. 19–36, 49–53. doi:10.1016/B978-0-12-415031-7.X5000-9. ISBN 978-0-12-415031-7.
  31. Shimada, K. (2019). "The size of the megatooth shark, Otodus megalodon (Lamniformes: Otodontidae), revisited". Historical Biology. 33 (7): 1–8. doi:10.1080/08912963.2019.1666840. ISSN 0891-2963. S2CID 208570844.
  32. Cooper, J. A.; Pimiento, C.; Ferrón, H. G.; Benton, M. J. (2020). "Body dimensions of the extinct giant shark Otodus megalodon: a 2D reconstruction". Scientific Reports. 10 (14596): 14596. Bibcode:2020NatSR..1014596C. doi:10.1038/s41598-020-71387-y. PMC 7471939. PMID 32883981.
  33. Perez, Victor; Leder, Ronny; Badaut, Teddy (2021). "Body length estimation of Neogene macrophagous lamniform sharks (Carcharodon and Otodus) derived from associated fossil dentitions". Palaeontologia Electronica. 24 (1): 1–28. doi:10.26879/1140.
  34. Ehret, D. A.; MacFadden, B. J.; Jones, D.; DeVries, T. J.; Foster, D. A.; Salas-Gismondi, R. (2012). "Origin of the White Shark Carcharodon (Lamniformes: Lamnidae), Based on Recalibration of the Late Neogene, Pisco Formation of Peru". Palaeontology. 55 (6): 1139–1153. doi:10.1111/j.1475-4983.2012.01201.x. S2CID 128666594.
  35. Nyberg, K. G.; Ciampaglio, C. N.; Wray, G. A. (2006). "Tracing the Ancestry of the Great White Shark, Carcharodon carcharias, Using Morphometric Analyses of Fossil Teeth". Journal of Vertebrate Paleontology. 26 (4): 806–814. doi:10.1671/0272-4634(2006)26[806:ttaotg]2.0.co;2. S2CID 53640614.
  36. Boessenecker, R. W.; Ehret, D. J.; Long, D. J.; Churchill, M.; Martin, E.; Boessenecker, S. J. (2019). "The Early Pliocene extinction of the mega-toothed shark Otodus megalodon: a view from the eastern North Pacific". PeerJ. 7: e6088. doi:10.7717/peerj.6088. PMC 6377595. PMID 30783558.
  37. Long, D. J.; Boessenecker, R. W.; Ehret, D. J. (2014), Timing of evolution in the Carcharodon lineage: Rapid morphological change creates a major shift in a predator's trophic niche
  38. Ebersole, J.A.; Ebersole, S.M.; Cicimurri, D.J. (2017). "The occurrence of early Pleistocene marine fish remains from the Gulf Coast of Mobile County, Alabama". Palaeodiversity. 10 (1): 97–115. doi:10.18476/pale.v10.a6. S2CID 134476316.
  39. Yun, C. (2021). "A tooth of the extinct lamnid shark, Cosmopolitodus planus comb. noc. (Chondrichthyes, Elasmobranchii) from the Miocene of Pohang City, South Korea" (PDF). Acta Palaeontologica Romaniae. 18 (1): 9–16. doi:10.35463/j.apr.2022.01.02. S2CID 242113412. Archived (PDF) from the original on 12 July 2021.
  40. Martin, R. A. "Fossil History of the White Shark". Elasmo Research.
  41. Trif, N.; Ciobanu, R.; Codrea, V. (2016). "The first record of the giant shark Otodus megalodon (Agassiz, 1835) from Romania". Brukenthal, Acta Musei. 11 (3): 507–526.
  42. "Areal Distribution of the White Shark". National Capital Freenet. Archived from the original on 10 October 2018. Retrieved 16 October 2010.
  43. Kabasakal, H. (2014). "The status of the great white shark (Carcharodon carcharias) in Turkey's waters" (PDF). Marine Biodiversity Records. 7. doi:10.1017/S1755267214000980. Archived (PDF) from the original on 16 June 2015.
  44. Johnson, R. L.; Venter, A.; Bester, M. N.; Oosthuizen, W. H. (April 2006). "Seabird predation by white shark, Carcharodon carcharias, and Cape fur seal, Arctocephalus pusillus pusillus, at Dyer Island". South African Journal of Wildlife Research. 36 (1): 23–32. Retrieved 22 May 2017.
  45. White, Connor F.; Lyons, Kady; Jorgensen, Salvador J.; O'Sullivan, John; Winkler, Chuck; Weng, Kevin C.; Lowe, Christopher G. (8 May 2019). "Quantifying habitat selection and variability in habitat suitability for juvenile white sharks". PLOS ONE. 14 (5): e0214642. Bibcode:2019PLoSO..1414642W. doi:10.1371/journal.pone.0214642. ISSN 1932-6203. PMC 6505937. PMID 31067227.
  46. Tanaka, Kisei R.; Van Houtan, Kyle S.; Mailander, Eric; Dias, Beatriz S.; Galginaitis, Carol; O’Sullivan, John; Lowe, Christopher G.; Jorgensen, Salvador J. (9 February 2021). "North Pacific warming shifts the juvenile range of a marine apex predator". Scientific Reports. 11 (1): 3373. Bibcode:2021NatSR..11.3373T. doi:10.1038/s41598-021-82424-9. ISSN 2045-2322. PMC 7873075. PMID 33564038.
  47. "South Africa – Australia – South Africa". White Shark Trust.
  48. Thomas, Pete (29 September 2006). "The Great White Way". Los Angeles Times. Retrieved 1 October 2006.
  49. Curtis, Tobey; McCandless, Camilla; Carlson, John; Skomal, Gregory; Kohler, Nancy; Natanson, Lisa; Burgess, George; Hoey, John; Pratt, Harold (June 2014). "Seasonal Distribution and Historic Trends in Abundance of White Sharks, Carcharodon carcharias, in the Western North Atlantic Ocean" (PDF). PLOS ONE. 9 (6): 12. Bibcode:2014PLoSO...999240C. doi:10.1371/journal.pone.0099240. PMC 4053410. PMID 24918579. Archived (PDF) from the original on 3 October 2017.
  50. Fieldstadt, Elisha (2 August 2019). "More than 150 great white sharks sightings logged off Cape Cod, Massachusetts, since June". NBC News. Retrieved 5 August 2019.
  51. Wasser, Miriam (2 August 2019). "Seals On Cape Cod Are More Than Just Shark Bait". WBUR. Retrieved 5 August 2019.
  52. Annear, Steve (18 June 2019). "Tracking great white sharks off Cape Cod could help protect beachgoers". The Boston Globe. Retrieved 5 August 2019.
  53. "Atlantic White Sharks Research — AWSC". Atlantic White Shark Conservancy. Retrieved 29 August 2021.
  54. Finucane, Martin (23 June 2018). "Great white sharks like to hang out in ocean eddies, new study says". The Boston Globe. Archived from the original on 24 June 2018. Retrieved 23 June 2018.
  55. "Confirmed: 'Albino' great white shark washes up in Australia | Sharks | Earth Touch News". Earth Touch News Network. 17 August 2023.
  56. "Great White Sharks, Carcharodon carcharias". Marine Bio. Retrieved 20 August 2012.
  57. "Great White Sharks Have Blue Eyes". The Atlantic White Shark Conservancy. Archived from the original on 2 July 2018. Retrieved 2 July 2018.
  58. Echenique, E. J. "A Shark to Remember: The Story of a Great White Caught in 1945". Archived from the original on 27 April 2012. Retrieved 22 January 2013. Home Page of Henry F. Mollet, Research Affiliate, Moss Landing Marine Laboratories.
  59. Tricas, T. C.; McCosker, J. E. (12 July 1984). "Predatory behaviour of the white shark (Carcharodon carcharias), with notes on its biology". Proceedings of the California Academy of Sciences. California Academy of Sciences. 43 (14): 221–238. Retrieved 22 January 2013.
  60. Wood, Gerald (1983). The Guinness Book of Animal Facts and Feats. ISBN 978-0-85112-235-9.
  61. "Just the Facts Please". GreatWhite.org. Retrieved 3 June 2016.
  62. Ellis, Richard and John E. McCosker. 1995. Great White Shark. Stanford University Press, ISBN 0-8047-2529-2
  63. "ADW: Carcharodon carcharias: Information". Animal Diversity Web. Retrieved 16 May 2016.
  64. Cappo, Michael (1988). "Size and age of the white pointer shark, Carcharodon carcharias (Linnaeus)". SAFISH. 13 (1): 11–13. Archived from the original on 6 January 2007.
  65. Wroe, S.; Huber, D. R.; Lowry, M.; McHenry, C.; Moreno, K.; Clausen, P.; Ferrara, T. L.; Cunningham, E.; Dean, M. N.; Summers, A. P. (2008). "Three-dimensional computer analysis of white shark jaw mechanics: how hard can a great white bite?" (PDF). Journal of Zoology. 276 (4): 336–342. doi:10.1111/j.1469-7998.2008.00494.x. Archived (PDF) from the original on 31 March 2011.
  66. Taylor, Leighton R. (1 January 1993). Sharks of Hawaii: Their Biology and Cultural Significance. University of Hawaii Press. p. 65. ISBN 978-0-8248-1562-2.
  67. "Great White Shark". National Geographic. Retrieved 24 July 2010.
  68. Mollet, H. F. (2008), White Shark Summary Carcharodon carcharias (Linnaeus, 1758), Home Page of Henry F. Mollet, Research Affiliate, Moss Landing Marine Laboratories, archived from the original on 31 May 2012
  69. Klimley, Peter; Ainley, David (1996). Great White Sharks: The Biology of Carcharodon carcharias. Academic Press. pp. 91–108. ISBN 978-0-12-415031-7.
  70. Jury, Ken (1987). "Huge 'White Pointer' Encounter". SAFISH. 2 (3): 12–13. Archived from the original on 17 April 2012.
  71. "Ep. 10. A Bathing Accident - Transcript". Shark Files.
  72. "Learn More About Deep Blue, One of the Biggest Great White Sharks Ever Filmed". Discovery.
  73. Staff, H. N. N. "Biggest great white shark on record seen in Hawaii waters". Hawaii News.
  74. Ciaccia, Chris (16 January 2019). "Great white shark, called 'Deep Blue,' spotted near Hawaii". Fox News.
  75. "Deep Blue, perhaps the largest known great white shark, spotted off Hawaii". 16 January 2019.
  76. Ferreira, Craig (2011). Great White Sharks On Their Best Behavior.
  77. Froese, Rainer; Pauly, Daniel (eds.) (2011). "Galeocerdo cuvier" in FishBase. July 2011 version.
  78. "Summary of Large Tiger Sharks Galeocerdo cuvier (Peron & LeSueur, 1822)". Archived from the original on 10 April 2012. Retrieved 3 May 2010.
  79. Eagle, Dane. "Greenland Shark". Florida Museum of Natural History. Archived from the original on 21 March 2013. Retrieved 1 September 2012.
  80. Martin, R. Aidan. "Pacific Sleeper Shark". ReefQuest Centre for Shark Research. Biology of Sharks and Rays. Archived from the original on 20 April 2013. Retrieved 1 September 2012.
  81. "Largest Great White Shark Specimens by Paleonerd01 on DeviantArt". www.deviantart.com. 16 February 2020.
  82. Christiansen, Heather M.; Lin, Victor; Tanaka, Sho; Velikanov, Anatoly; Mollet, Henry F.; Wintner, Sabine P.; Fordham, Sonja V.; Fisk, Aaron T.; Hussey, Nigel E. (16 April 2014). "The Last Frontier: Catch Records of White Sharks (Carcharodon carcharias) in the Northwest Pacific Ocean". PLOS ONE. 9 (4): e94407. Bibcode:2014PLoSO...994407C. doi:10.1371/journal.pone.0094407. PMC 3989224. PMID 24740299.
  83. "'Barnacle Lil' Still Terror Of West Coast Deep". The Chronicle. Streaky Bay. 17 April 1952 via Trove.
  84. "White Shark Summary Carcharodon carcharias (Linnaeus, 1758)". www.elasmollet.org.
  85. Alessandro De Maddalena & Walter Heim (2015). Mediterranean Great White Sharks: A Comprehensive Study Including All Recorded Sightings. McFarland. ISBN 978-0786488155.
  86. "On the great white shark, Carcharodon carcharias (Linnaeus, 1758), preserved in the Museum of Zoology in Lausanne". ResearchGate.
  87. Nevres, M. Özgür (6 October 2018). "Largest great white sharks ever recorded". Our Planet.
  88. "An analysis of photographic evidences of the largest great white sharks (Carcharodon carcharias), Linnaeus 1758, captures in the Mediterranean sea with considerations about the maximum size of the species". ResearchGate.
  89. "Squalus Carcharias: Le TRÈS Grand Requin Blanc !". 29 July 2013.
  90. Gerald L Wood (1982). Guinness Book of World Records Animal Facts and Feats. Sterling Pub Co., Inc. ISBN 978-0851122359.
  91. Molotsky, Irvin M (24 June 1978). "Harpooned Shark Pulls Fishing Boat 14 Hours Off L.I." New York Times.
  92. "Deep Blue". 19 March 2017.
  93. "One of biggest great white sharks seen feasting on sperm whale in rare video". Animals. 19 July 2019.
  94. "The Big One, a Great White story from Grand Manan". new-brunswick.net.
  95. Vladykov, Vadim D. (Vadim Dmitrij); McKenzie, Ross A. (17 May 1935). "The marine fishes of Nova Scotia". Proceedings of the Nova Scotian Institute of Science via dalspace.library.dal.ca.
  96. "Photograph, Shark at Cowes, 1987". Victorian Collections, Phillip Island and District Historical Society.
  97. "Photo of dead shark".
  98. King B, Hu Y, Long JA (May 2018). "Electroreception in early vertebrates: survey, evidence and new information". Palaeontology. 61 (3): 325–58. doi:10.1111/pala.12346.
  99. "The physiology of the ampullae of Lorenzini in sharks". Biology Dept., Davidson College. Biology @ Davidson. Archived from the original on 24 November 2010. Retrieved 20 August 2012.
  100. Martin, R. Aidan. "Body Temperature of the Great white and Other Lamnoid Sharks". ReefQuest Centre for Shark research. Retrieved 16 October 2010.
  101. White Shark Biological Profile Archived 27 January 2013 at the Wayback Machine from the Florida Museum of Natural History
  102. Barber, Elizabeth (18 July 2013). "Great white shark packs its lunch in its liver before a big trip". The Christian Science Monitor. Archived from the original on 2 August 2013.
  103. Jordan, Rob (17 July 2013). "Great White Sharks' Fuel for Oceanic Voyages: Liver Oil". sciencedaily.com. Stanford University.
  104. Solly, Meilan (3 April 2019). "Great White Sharks Thrive Despite Heavy Metals Coursing Through Their Veins". Smithsonian Magazine. Archived from the original on 30 June 2019. Retrieved 30 June 2019.
  105. Medina, Samantha (27 July 2007). "Measuring the great white's bite". Cosmos Magazine. Archived from the original on 5 May 2012. Retrieved 1 September 2012.
  106. Martin, R. Aidan; Martin, Anne (October 2006). "Sociable Killers: New studies of the white shark (aka great white) show that its social life and hunting strategies are surprisingly complex". Natural History. Retrieved 24 November 2019.
  107. Papastamatiou, Yannis P.; Mourier, Johann; TinHan, Thomas; Luongo, Sarah; Hosoki, Seiko; Santana-Morales, Omar; Hoyos-Padilla, Mauricio (23 March 2022). "Social dynamics and individual hunting tactics of white sharks revealed by biologging". Biology Letters. 18 (3): 20210599. doi:10.1098/rsbl.2021.0599. PMC 8941395. PMID 35317626.
  108. Martin, R. Aidan; Martin, Anne. "Sociable Killers". Natural History Magazine. Archived from the original on 15 May 2013. Retrieved 30 September 2006.
  109. Bittel, Jason (8 July 2022). "Great white sharks may change their colour to sneak up on prey". National Geographic. Retrieved 15 July 2022.
  110. Ouellette, Jennifer (11 July 2022). "Camo Sharks documents hunt for evidence that great white sharks change color". Ars Technica. Retrieved 15 July 2022.
  111. Johnson, R. L.; Venter, A.; Bester, M.N.; Oosthuizen, W.H. (2006). "Seabird predation by white shark Carcharodon carcharias and Cape fur seal Arctocephalus pusillus pusillus at Dyer Island" (PDF). South African Journal of Wildlife Research. South Africa. 36 (1): 23–32. Archived from the original (PDF) on 3 April 2012.
  112. "Teenage great white sharks are awkward biters". ScienceDaily. 2 December 2010. Retrieved 6 February 2023.
  113. "White shark diets show surprising variability, vary with age and among individuals". ScienceDaily. 29 December 2012. Retrieved 6 February 2023.
  114. Estrada, J. A.; Rice, Aaron N.; Natanson, Lisa J.; Skomal, Gregory B. (2006). "Use of isotopic analysis of vertebrae in reconstructing ontogenetic feeding ecology in white sharks". Ecology. 87 (4): 829–834. doi:10.1890/0012-9658(2006)87[829:UOIAOV]2.0.CO;2. PMID 16676526.
  115. Fergusson, I. K.; Compagno, L. J.; Marks, M. A. (2000). "Predation by white sharks Carcharodon carcharias (Chondrichthyes: Lamnidae) upon chelonians, with new records from the Mediterranean Sea and a first record of the ocean sunfish Mola mola (Osteichthyes: Molidae) as stomach contents". Environmental Biology of Fishes. 58 (4): 447–453. doi:10.1023/a:1007639324360. S2CID 31232421.
  116. Hussey, N. E., McCann, H. M., Cliff, G., Dudley, S. F., Wintner, S. P., & Fisk, A. T. (2012). Size-based analysis of diet and trophic position of the white shark (Carcharodon carcharias) in South African waters. Global Perspectives on the Biology and Life History of the White Shark. (Ed. ML Domeier.) pp. 27–49.
  117. "Catch as Catch Can". ReefQuest Centre for Shark Research. Retrieved 16 October 2010.
  118. "How Fast Can a Shark Swim?". ReefQuest Centre for Shark Research.
  119. "White Shark Predatory Behavior at Seal Island". ReefQuest Centre for Shark Research.
  120. Le Boeuf, B. J.; Crocker, D. E.; Costa, D. P.; Blackwell, S. B.; Webb, P. M.; Houser, D. S. (2000). "Foraging ecology of northern elephant seals". Ecological Monographs. 70 (3): 353–382. doi:10.2307/2657207. JSTOR 2657207.
  121. Haley, M. P.; Deutsch, C. J.; Le Boeuf, B. J. (1994). "Size, dominance and copulatory success in male northern elephant seals, Mirounga angustirostris". Animal Behaviour. 48 (6): 1249–1260. doi:10.1006/anbe.1994.1361. S2CID 54388167.
  122. Weng, K. C.; Boustany, A. M.; Pyle, P.; Anderson, S. D.; Brown, A.; Block, B. A. (2007). "Migration and habitat of white sharks (Carcharodon carcharias) in the eastern Pacific Ocean". Marine Biology. 152 (4): 877–894. doi:10.1007/s00227-007-0739-4. S2CID 39985022.
  123. Martin, Rick. "Predatory Behavior of Pacific Coast White Sharks". Shark Research Committee. Archived from the original on 30 July 2012.
  124. Chewning, Dana; Hall, Matt. "Carcharodon carcharias (Great white shark)". Animal Diversity Web. Retrieved 15 August 2019.
  125. Heithaus, Michael (2001). "Predator–prey and competitive interactions between sharks (order Selachii) and dolphins (suborder Odontoceti): a review" (PDF). Journal of Zoology. 253: 53–68. CiteSeerX 10.1.1.404.130. doi:10.1017/S0952836901000061. Archived from the original (PDF) on 15 January 2016. Retrieved 26 February 2010.
  126. Long, Douglas (1991). "Apparent Predation by a White Shark Carcharodon carcharias on a Pygmy Sperm Whale Kogia breviceps" (PDF). Fishery Bulletin. 89: 538–540. Archived (PDF) from the original on 16 September 2008.
  127. Kays, R. W., & Wilson, D. E. (2009). Mammals of North America. Princeton University Press.
  128. Baird, R. W.; Webster, D. L.; Schorr, G. S.; McSweeney, D. J.; Barlow, J. (2008). "Diet variation in beaked whale diving behavior" (PDF). Marine Mammal Science. 24 (3): 630–642. doi:10.1111/j.1748-7692.2008.00211.x. hdl:10945/697. S2CID 9876850. Archived (PDF) from the original on 21 February 2008.
  129. Krkosek, Martin; Fallows, Chris; Gallagher, Austin J.; Hammerschlag, Neil (2013). "White Sharks (Carcharodon carcharias) Scavenging on Whales and Its Potential Role in Further Shaping the Ecology of an Apex Predator". PLOS ONE. 8 (4): e60797. Bibcode:2013PLoSO...860797F. doi:10.1371/journal.pone.0060797. PMC 3621969. PMID 23585850.
  130. Dudley, Sheldon F. J.; Anderson-Reade, Michael D.; Thompson, Greg S.; McMullen, Paul B. (2000). "Concurrent scavenging off a whale carcass by great white sharks, Carcharodon carcharias, and tiger sharks, Galeocerdo cuvier" (PDF). Marine Biology. Fishery Bulletin. Archived from the original (PDF) on 27 May 2010. Retrieved 4 May 2010.
  131. Dines, Sasha; Gennari, Enrico (29 January 2020). "First observations of white sharks (Carcharodon carcharias) attacking a live humpback whale (Megaptera novaeangliae)". Marine and Freshwater Research. 71 (9): 1205. doi:10.1071/MF19291. S2CID 212969014 via www.publish.csiro.au.
  132. Márquez, Melissa Cristina. "First Observations Of White Sharks Attacking A Live Humpback Whale". Forbes.
  133. "Drone footage shows a great white shark drowning a 33ft humpback whale". The Independent. 15 July 2020.
  134. Fish, Tom (15 July 2020). "Shark attack: Watch 'strategic' Great White hunt down and kill 10 Metre humpback whale". Express.co.uk.
  135. Owens, Brian (12 February 2016). "White shark's diet may include biggest fish of all: whale shark". New Scientist.
  136. Moore, G. I.; Newbrey, M. G. (2015). "Whale shark on a white shark's menu". Marine Biodiversity. 46 (4): 745. doi:10.1007/s12526-015-0430-9. S2CID 36426982.
  137. "Natural History of the White Shark". PRBO Conservation Science. 2 May 2010. Archived from the original on 3 July 2013.
  138. "Legendary Great White Shark Was Just A Teenager When Killed, New Research Reveals". The Inquisitr News. 9 March 2015.
  139. Roy, Eleanor Ainge (4 September 2020). "'Rolling and rolling and rolling': the first detailed account of great white shark sex". The Guardian via www.theguardian.com.
  140. "Carcharodon carcharias, Great White Sharks". marinebio.org.
  141. "Brief Overview of the Great White Shark (Carcharodon carcharias)". Elasmo Research. Retrieved 20 August 2012.
  142. Animals, Kimberly Hickok 2019-03-22T19:03:40Z (22 March 2019). "Enormous Great White Shark Pregnant with Record 14 Pups Was Caught and Sold in Taiwan". livescience.com.
  143. Martin, R. Aidan. "White Shark Breaching". ReefQuest Centre for Shark Research. Retrieved 18 April 2012.
  144. Martin, R. A.; Hammerschlag, N.; Collier, R. S.; Fallows, C. (2005). "Predatory behaviour of white sharks (Carcharodon carcharias) at Seal Island, South Africa". Journal of the Marine Biological Association of the UK. 85 (5): 1121. CiteSeerX 10.1.1.523.6178. doi:10.1017/S002531540501218X. S2CID 17889919.
  145. Rice, Xan (19 July 2011). "Great white shark jumps from sea into research boat". The Guardian. London. Retrieved 20 July 2011. Marine researchers in South Africa had a narrow escape after a 3 m (10 ft) long great white shark breached the surface of the sea and leapt into their boat, becoming trapped on deck for more than an hour. [...] Enrico Gennari, an expert on great white sharks, [...] said it was almost certainly an accident rather than an attack on the boat.
  146. Pyle, Peter; Schramm, Mary Jane; Keiper, Carol; Anderson, Scot D. (26 August 2006). "Predation on a white shark (Carcharodon carcharias) by a killer whale (Orcinus orca) and a possible case of competitive displacement" (PDF). Marine Mammal Science. 15 (2): 563–568. doi:10.1111/j.1748-7692.1999.tb00822.x. Archived from the original (PDF) on 22 March 2012. Retrieved 8 May 2010.
  147. "Nature Shock Series Premiere: The Whale That Ate the Great White". Tvthrong.co.uk. 4 October 1997. Archived from the original on 6 April 2012. Retrieved 16 October 2010.
  148. Turner, Pamela S. (October–November 2004). "Showdown at Sea: What happens when great white sharks go fin-to-fin with killer whales?". National Wildlife. National Wildlife Federation. 42 (6). Archived from the original on 16 January 2011. Retrieved 21 November 2009.
  149. "Great white shark 'slammed' and killed by a pod of killer whales in South Australia". Australian Broadcasting Corporation. 3 February 2015. Retrieved 10 July 2015.
  150. Haden, Alexis (6 June 2017). "Killer whales have been killing great white sharks in Cape waters". The South African. Retrieved 27 June 2017.
  151. Jorgensen, S. J.; et al. (2019). "Killer whales redistribute white shark foraging pressure on seals". Scientific Reports. 9 (1): 6153. Bibcode:2019NatSR...9.6153J. doi:10.1038/s41598-019-39356-2. PMC 6467992. PMID 30992478.
  152. Starr, Michell (11 November 2019). "Incredible Footage Reveals Orcas Chasing Off The Ocean's Most Terrifying Predator". Science Alert. Retrieved 24 November 2019.
  153. Benchley, Peter (April 2000). "Great white sharks". National Geographic: 12. ISSN 0027-9358. considering the knowledge accumulated about sharks in the last 25 years, I couldn't possibly write Jaws today ... not in good conscience anyway ... back then, it was OK to demonize an animal.
  154. Martin, R. Aidan (2003). "White Shark Attacks: Mistaken Identity". Biology of Sharks and Rays. ReefQuest Centre for Shark Research. Retrieved 30 August 2016.
  155. Ryan, Laura A.; Slip, David J.; Chapuis, Lucille; Collin, Shaun P.; Gennari, Enrico; Hemmi, Jan M.; How, Martin J.; Huveneers, Charlie; Peddemors, Victor M.; Tosetto, Louise; Hart, Nathan S. (2021). "A shark's eye view: testing the 'mistaken identity theory' behind shark bites on humans". Journal of the Royal Society Interface. 18 (183): 20210533. doi:10.1098/rsif.2021.0533. PMC 8548079. PMID 34699727.
  156. "ISAF Statistics for Worldwide Unprovoked White Shark Attacks Since 1990". 10 February 2011. Retrieved 19 August 2011.
  157. Tricas, T.C.; McCosker, John (1984). "Predatory behavior of the white shark, Carcharodon carcharias, and notes on its biology". Proceedings of the California Academy of Sciences. Series 4. 43 (14): 221–238.
  158. "Shark culling". marineconservation.org.au. Archived from the original on 2 October 2018. Retrieved 30 August 2019.
  159. Phillips, Jack (4 September 2018), Video: Endangered Hammerhead Sharks Dead on Drum Line in Great Barrier Reef, Ntd.tv, archived from the original on 19 September 2018, retrieved 30 August 2019
  160. Thom Mitchell (20 November 2015), Action for Dolphins. Queensland's Shark Control Program Has Snagged 84,000 Animals, retrieved 30 August 2019
  161. Roff, George; Brown, Christopher J.; Priest, Mark A.; Mumby, Peter J. (2018). "Decline of coastal apex shark populations over the past half century". Communications Biology. 1 (1): 1–11. doi:10.1038/s42003-018-0233-1. PMC 6292889. PMID 30564744.
  162. Wang, Kelly (4 September 2018). "Heartbreaking Photos Show the Brutal Lengths Australia Is Going to In Order to 'Keep Sharks Away From Tourists'". One Green Planet. Retrieved 29 August 2019.
  163. Mackenzie, Bruce (4 August 2018), Sydney Shark Nets Set to Stay Despite Drumline Success, Swellnet.com., retrieved 30 August 2019
  164. Shark Nets, Sharkangels.org, archived from the original on 19 September 2018, retrieved 30 August 2019
  165. "New measures to combat WA shark risks". Department of Fisheries, Western Australia. 10 December 2013. Archived from the original on 1 February 2014. Retrieved 2 February 2014.
  166. Arup, Tom (21 January 2014), "Greg Hunt grants WA exemption for shark cull plan", The Sydney Morning Herald, Fairfax Media, archived from the original on 22 January 2014
  167. "Can governments protect people from killer sharks?". Australian Broadcasting Corporation. 22 December 2013. Retrieved 2 February 2014.
  168. "Australia shark policy to stay, despite threats". www.tvnz.co.nz. Associated Press. 29 January 2014. Archived from the original on 30 January 2014. Retrieved 6 February 2023.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
  169. "More than 100 shark scientists, including me, oppose the cull in Western Australia". 23 December 2013. Retrieved 31 August 2016.
  170. "Unprovoked White Shark Attacks on Kayakers". Shark Research Committee. Retrieved 14 September 2008.
  171. Tricas, Timothy C.; McCosker, John E. (1984). "Predatory Behaviour of the White Shark (Carcharodon carcharias), with Notes on its Biology" (PDF). Proceedings of the California Academy of Sciences. 43 (14): 221–238. Archived (PDF) from the original on 7 September 2008.
  172. "Great white shark sets record at California aquarium". USA Today. 2 October 2004. Retrieved 27 September 2006.
  173. Hopkins, Christopher Dean (8 January 2016). "Great White Shark Dies After Just 3 Days In Captivity At Japan Aquarium". NPR. Archived from the original on 3 April 2017. Retrieved 21 December 2017.
  174. Gathright, Alan (16 September 2004). "Great white shark puts jaws on display in aquarium tank". San Francisco Chronicle. Retrieved 27 September 2006.
  175. "White Shark Research Project". Monterey Bay Aquarium. Archived from the original on 19 January 2013. Retrieved 27 September 2006.
  176. Squatriglia, Chuck (1 September 2003). "Great white shark introduced at Monterey Bay Aquarium". San Francisco Chronicle. Retrieved 27 September 2006.
  177. "Learn All About Our New White Shark". Monterey Bay Aquarium. Archived from the original on 20 November 2009. Retrieved 28 August 2009.
  178. "New great white shark goes on display at Monterey Bay Aquarium". 1 September 2011.
  179. "Great White Shark Dies Shortly After Release From Monterey Aquarium". 3 November 2011.
  180. "Great white shark dies after release from Monterey Bay Aquarium". Los Angeles Times. 3 November 2011.
  181. "White Shark". Monterey Bay Aquarium. Retrieved 21 August 2021.
  182. Hongo, Jun (8 January 2016). "Great White Shark Dies at Aquarium in Japan". Wall Street Journal. Retrieved 9 January 2016.
  183. "Great white shark dies after three days in Japanese aquarium". Telegraph.co.uk. Archived from the original on 7 January 2016. Retrieved 9 January 2016.
  184. "Electroreception". Elasmo-research. Retrieved 27 September 2006.
  185. "There's a Reason You'll Never See a Great White Shark in an Aquarium". 11 July 2016.
  186. "Shark cage diving". Department of Environment, Water and Natural Resources. Archived from the original on 9 April 2013. Retrieved 11 March 2013.
  187. Squires, Nick (18 January 1999). "Swimming With Sharks". BBC. Archived from the original on 17 August 2003. Retrieved 21 January 2010.
  188. Simon, Bob (11 December 2005). "Swimming With Sharks". 60 Minutes. Retrieved 22 January 2010.
  189. "Blue Water Hunting Successfully". Blue Water Hunter. Archived from the original on 18 August 2012. Retrieved 20 August 2012.
  190. "A Great white shark's favorite tune? 'Back in Black'" Archived 16 April 2016 at the Wayback Machine Surfersvillage Global Surf News (3 June 2011). Retrieved 30 January 2014.
  191. "Shark Attacks Compared to Lightning". Florida Museum of Natural History. 18 July 2003. Retrieved 7 November 2006.
  192. Hamilton, Richard (15 April 2004). "SA shark attacks blamed on tourism". BBC. Archived from the original on 23 March 2012. Retrieved 24 October 2006.
  193. "Regulation of Trade in Specimens of Species Included in Appendix II". CITES (1973). Archived from the original on 17 July 2011. Retrieved 8 April 2012.
  194. "Memorandum of Understanding on the Conservation of Migratory Sharks" (PDF). Convention on Migratory Species. 12 February 2010. Archived from the original (PDF) on 20 April 2013. Retrieved 31 August 2012.
  195. Sample, Ian (19 February 2010). "Great white shark is more endangered than tiger, claims scientist". The Guardian. Retrieved 14 August 2013.
  196. Jenkins, P. Nash (24 June 2014). "Beachgoers Beware: The Great White Shark Population Is Growing Again". Time. Retrieved 29 October 2014.
  197. Gannon, Megan (20 June 2014). "Great White Sharks Are Making a Comeback off US Coasts". livescience.com. Retrieved 29 October 2014.
  198. De Maddalena, Alessandro; Heim, Walter (2012). Mediterranean Great White Sharks: A Comprehensive Study Including All Recorded Sightings. McFarland. ISBN 978-0-7864-5889-9.
  199. Government of Australia. "Species Profile and Threats Database – Carcharodon carcharias—Great White Shark". Retrieved 21 August 2013.
  200. Environment Australia (2002). White Shark (Carcharodon carcharias) Recovery Plan (Report).
  201. Blower, Dean C.; Pandolfi, John M.; Bruce, Barry D.; Gomez-Cabrera, Maria del C.; Ovenden, Jennifer R. (2012). "Population genetics of Australian white sharks reveals fine-scale spatial structure, transoceanic dispersal events and low effective population sizes". Marine Ecology Progress Series. 455: 229–244. Bibcode:2012MEPS..455..229B. doi:10.3354/meps09659.
  202. "About the Campaign: Sea Shepherd Working Together With The Community To Establish Sustainable Solutions To Shark Bite Incidents". seashepherd.org. Archived from the original on 8 April 2018. Retrieved 29 August 2019.
  203. Hillary, Rich; Bradford, Russ; Patterson, Toby (8 February 2018). "World-first genetic analysis reveals Aussie white shark numbers". The Conversation. Retrieved 21 August 2021.
  204. Vennell, Robert (5 October 2022). Secrets of the Sea: The Story of New Zealand's Native Sea Creatures. HarperCollins Publishers Ltd. pp. 164–169. ISBN 978-1-77554-179-0. Wikidata Q114871191.
  205. "Great white sharks to be protected". The New Zealand Herald. 30 November 2006. Retrieved 30 November 2006.
  206. Duffy, Clinton A. J.; Francis, Malcolm; Dunn, M. R.; Finucci, Brit; Ford, Richard; Hitchmough, Rod; Rolfe, Jeremy (2018). Conservation status of New Zealand chondrichthyans (chimaeras, sharks and rays), 2016 (PDF). Wellington, New Zealand: Department of Conservation. p. 9. ISBN 978-1-988514-62-8. OCLC 1042901090. Archived (PDF) from the original on 15 January 2019.
  207. Quan, Kristene (4 March 2013). "Great White Sharks Are Now Protected under California Law". Time.
  208. Williams, Lauren (3 July 2014). "Shark numbers not tanking". Huntington Beach Wave. The Orange County Register. p. 12.
  209. Burgess, George H.; Bruce, Barry D.; Cailliet, Gregor M.; Goldman, Kenneth J.; Grubbs, R. Dean; Lowe, Christopher J.; MacNeil, M. Aaron; Mollet, Henry F.; Weng, Kevin C.; O'Sullivan, John B. (16 June 2014). "A Re-Evaluation of the Size of the White Shark (Carcharodon carcharias) Population off California, USA". PLoS ONE. 9 (6): e98078. Bibcode:2014PLoSO...998078B. doi:10.1371/journal.pone.0098078. PMC 4059630. PMID 24932483.
  210. New Regulations Affecting Activity around White Sharks. Commonwealth of Massachusetts, Division of Marine Fisheries (4 June 2015)

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