Shark attack

Attack on a human by a shark

For other uses, see Shark Attack (disambiguation).

Medical condition

Shark attack

A sign warning about the presence of sharks off Salt Rock, South Africa
Symptoms| Bleeding, Lacerations from the shark’s teeth
Complications| Amputation, blood loss, sepsis
Causes| Sharks
Risk factors| Surfing, storms, being stuck adrift, swimming at night
Prevention| Shark barrier, Shark nets, Drum lines, range of other methods
Frequency| Rare

A shark attack is an attack on a human by a shark. Every year, around 80 unprovoked attacks are reported worldwide.[1] Despite their rarity,[2][3][4][5] many people fear shark attacks after occasional serial attacks, such as the Jersey Shore shark attacks of 1916, and horror fiction and films such as the Jaws series. Out of more than 500 shark species, only three are responsible for a double-digit number of fatal, unprovoked attacks on humans: the great white, tiger, and bull.[6] The oceanic whitetip has probably killed many more shipwreck and plane crash survivors, but these are not recorded in the statistics.[7] Humans are not part of a shark's normal diet. Sharks usually feed on small fish and invertebrates, seals, sea lions, and other marine mammals. A shark attack will usually occur if the shark feels curious or confused.[8]

## Terminology

[edit]

While the term "shark attack" is in common use for instances of humans being wounded by sharks, it has been suggested that this is based largely on the assumption that large predatory sharks (such as great white, bull, and tiger sharks) seek humans as prey. A 2013 review recommends that only in instances where a shark clearly predates on a human should the bite incident be termed an "attack," implying predation. Otherwise, it is more accurate to class bite incidents as "fatal bite incidents". Sightings do include physical interaction, encounters including physical interaction with harm, shark bites include major shark bite incidents, including those that require medical attention, and fatal shark bite incidents that result in death. The study suggests that only where an expert validates the predatory intent of a shark would it be appropriate to term a bite incident an attack.[9]

## Types of attacks

[edit]

Shark attack indices use different criteria to determine if an attack was "provoked" or "unprovoked." When considered from the shark's point of view, attacks on humans who are perceived as a threat to the shark or a competitor to its food source are all "provoked" attacks. Neither the International Shark Attack File (ISAF) nor the Global Shark Attack File (GSAF) accord casualties of air/sea disasters "provoked" or "unprovoked" status. Rather, these incidents are considered a separate category.[10][11] Postmortem scavenging of human remains (typically drowning victims) are also not accorded "provoked" or "unprovoked" status.[11][12] The GSAF categorizes scavenging bites on humans as "questionable incidents."[11] The most common criteria for determining "provoked" and "unprovoked" attacks are discussed below:

### Provoked attack

[edit]

Provoked attacks occur when a human touches, hooks, nets, or otherwise aggravates the animal. Incidents that occur outside of a shark's natural habitat, such as aquariums and research holding-pens, are considered provoked, as are all incidents involving captured sharks. Sometimes humans inadvertently provoke an attack, such as when a surfer accidentally hits a shark with a surf board.

### Unprovoked attack

[edit]

Unprovoked attacks are initiated by the shark—they occur in a shark's natural habitat on a live human and without human provocation.[10][11] There are three subcategories of unprovoked attack:

* Hit-and-run attack – usually non-fatal, the shark bites and then leaves; most victims do not see the shark. This is the most common type of attack and typically occurs in the surf zone or in murky water. Most hit-and-run attacks are believed to be the result of mistaken identity.[13]
* Sneak attack – the victim will not usually see the shark, and may sustain multiple deep bites. This kind of attack is predatory in nature and is often carried out with the intention of consuming the victim. It is extraordinarily rare for this to occur.
* Bump-and-bite attack – the shark circles and bumps the victim before biting. Great whites are known to do this on occasion, referred to as a "test bite", in which the great white is trying to identify what is being bitten. Repeated bites, depending on the reaction of the victim (thrashing or panicking may lead the shark to believe the victim is prey), are not uncommon and can be severe or fatal. Bump-and-bite attacks are not believed to be the result of mistaken identity.[13]

An incident occurred in 2011 when a 3-meter long (~500 kg) great white shark jumped onto a 7-person research vessel off Seal Island, South Africa. The crew were undertaking a population study using sardines as bait and initially retreated to safety in the bow of the ship while the shark thrashed about, damaging equipment and fuel lines. To keep the shark alive while a rescue ship towed the research vessel to shore, the crew poured water over its gills and eventually used a pump for mechanical ventilation. The shark was ultimately lifted back into the water by crane and, after becoming disoriented and beaching itself in the harbor, was successfully towed out to sea. The incident was judged an accident.[14]

## Reasons for attacks

[edit]

Large shark species are apex predators in their environment,[15] and thus have little fear of any creature (other than orcas[16]) with which they cross paths. Like most sophisticated hunters, they are curious when they encounter something unusual in their territories. Lacking any limbs with sensitive digits such as hands or feet, the only way they can explore an object or organism is to bite it. These bites are known as test bites.[17] Generally, shark bites are exploratory, and the animal will swim away after one bite.[17] For example, exploratory bites on surfers are thought to be caused by the shark mistaking the surfer and surfboard for the shape of prey.[18] Nonetheless, a single bite can grievously injure a human if the animal involved is a powerful predator such as a great white or tiger shark.[19]

A shark will normally make one swift attack and then retreat to wait for the victim to die or weaken from shock and blood loss, before returning to feed. This protects the shark from injury from a wounded and aggressive target; it also allows humans time to get out of the water and survive.[20] Shark attacks may also occur due to territorial reasons or as dominance over another shark species.[21]

Sharks are equipped with sensory organs called the Ampullae of Lorenzini that detect the electricity generated by muscle movement.[22] The shark's electrical receptors, which pick up movement, detect signals like those emitted from wounded fish. For example, someone who is spearfishing, leading the shark to attack the person by mistake.[21] According to George H. Burgess, director of the International Shark Attack File, "Attacks are basically an odds game based on how many hours you are in the water".[23]

## Statistics

[edit]

Total shark attacks per year, 1749 to 2018[24]

According to the International Shark Attack File (ISAF), between 1958 and 2016 there were 2,785 confirmed unprovoked shark attacks around the world, of which 439 were fatal.[25] Between 2001 and 2010, an average of 4.3 people per year died from shark attacks.[3]

In 2000, there were 79 shark attacks reported worldwide, 11 of them fatal.[26] In 2005 and 2006, this number decreased to 61 and 62 respectively, while the number of fatalities dropped to only four per year.[26] The 2016 yearly total of 81 shark attacks worldwide was on par with the most recent five-year (2011–2015) average of 82 incidents annually.[27] By contrast, the 98 shark attacks in 2015 was the highest yearly total on record.[27] There were four fatalities worldwide in 2016, which is lower than the average of eight fatalities per year worldwide in the 2011–2015 period and six deaths per annum over the past decade.[27] In 2016, 58% of attacks were on surfers.[27]

Despite these reports, however, the actual number of fatal shark attacks worldwide remains uncertain. In most Third World coastal nations, no method of reporting suspected shark attacks exists. Therefore, losses and fatalities near-shore or at sea often remain unsolved or unpublicized.

Of these attacks, most occurred in the United States (53 in 2000, 40 in 2005, and 39 in 2006).[28] The New York Times reported in July 2008 that there had been only one fatal attack in the previous year.[29] On average, there are 16 shark attacks per year in the United States, with one fatality every two years.[30] According to the ISAF, the US states in which the most attacks have occurred are Florida, Hawaii, California, Texas and the Carolinas, though attacks have occurred in almost every coastal state.[31]

Australia has the highest number of fatal shark attacks in the world, with Western Australia recently becoming the deadliest place in the world for shark attacks[32] with total and fatal shark bites growing exponentially over the last 40 years.[33] Since 2000, there have been 17 fatal shark attacks along the West Australian coast,[34] with divers now facing odds of one in 16,000 for a fatal shark bite.[33][35]

Other shark attack hotspots include Réunion Island,[36] Boa Viagem in Brazil, Makena Beach in Maui, Hawaii, and Second Beach, Port St. Johns, South Africa.[37] South Africa has a high number of shark attacks along with a high fatality rate of 27 percent.[38]

As of 28 June 1992,[39] Recife in Brazil began officially registering shark attacks on its beaches (mainly on the beach of Boa Viagem). Over more than two decades, 64 victims were attacked, of whom 26 died. The last deadly attack occurred on 10 July 2021.[40] The attacks were caused by the bull shark and tiger shark species.[41] The shark attacks in Recife have an unusually high fatality rate of about 37%. This is much higher than the worldwide shark attack fatality rate, which is currently about 16%, according to Florida State Museum of Natural History.[42] Several factors have contributed to the unusually high attack and fatality rates, including pollution from sewage runoff[43] and a (now closed) local slaughterhouse.[44]

The place with the most recorded shark attacks is New Smyrna Beach, Florida.[45] Developed nations such as the United States, Australia and, to some extent, South Africa, facilitate more thorough documentation of shark attacks on humans than developing coastal nations. The increased use of technology has enabled Australia and the United States to record more data than other nations, which could somewhat bias the results. In addition, individuals and institutions in South Africa, the United States, and Australia keep a file which is regularly updated by an entire research team, the International Shark Attack File, and the Australian Shark Attack File.

The Florida Museum of Natural History compares these statistics with the much higher rate of deaths from other causes. For example, an average of more than 38 people die annually from lightning strikes in coastal states, while less than 1 person per year is killed by a shark in Florida.[46][47] In the United States, the likelihood that a person who goes to beaches will be attacked by a shark is 1 in 11.5 million, and a person's chance of getting killed by a shark is less than 1 in 264.1 million.

However, in certain situations the risk of a shark attack is higher. For example, in the southwest of Western Australia the chances of a surfer being fatally bitten by a shark in winter or spring are 1 in 40,000 and for divers it is 1 in 16,000.[33][35] In comparison to the risk of a serious or fatal cycling accident, this represents three times the risk for a surfer and seven times the risk for a diver.[33]

In comparison to previous years, ISAF reported a total of 57 unprovoked shark bites worldwide in 2022, which is lower than the past five-year average of 70 incidents annually. There were also 32 provoked bites, 4 boat bites, and a few other incidents classified differently, totaling 108 cases investigated by ISAF in 2022. This reflects a decrease in both fatal and non-fatal shark bites.[48]

Confirmed unprovoked shark attacks, 1958–2023  Region  | Total
attacks  | Fatal
attacks  | Last
fatality

|
|
|

United States[a] | 1106 | 37 | 2021
Australia | 647 | 261 | 2025[49]
Africa | 347 | 95 | 2023
Asia | 129 | 48 | 2000
Hawaii | 137[50] | 11[50] | 2024[51]
Pacific Islands / Oceania [b] | 129 | 50 | 2023
South America | 117 | 26 | 2018[52]
Antilles and Bahamas | 71 | 17 | 2022
Middle America | 56 | 27 | 2011
Europe | 52[53] | 27 | 1989
New Zealand | 50 | 10 | 2021
Réunion Island | 39 | 19 | 2019[54]
Unspecified / Open ocean | 21 | 7 | 1995
Bermuda | 3 | 0 | —
Total:  | 2900  | 633  | 2023
Sources: Shark Attack Data Australia Australian Shark Attack File for unprovoked attacks in Australia
International Shark Attack File for unprovoked attacks in all other regions

Last Updated: 9 February 2023

## Species involved in incidents

[edit]

A blacktip reef shark. In rare circumstances such as poor visibility, blacktips may bite humans, mistaking them for prey. Under normal conditions, however, they are harmless and often even quite shy.

Only a few shark species are dangerous to humans. Out of more than 480 shark species, only three are responsible for two-digit numbers of fatal unprovoked attacks on humans: the great white, tiger and bull.[6] However, the oceanic whitetip has probably killed many more ship wreck and plane crash survivors, who have not been included in the statistics.[7] These sharks, being large and powerful predators, may sometimes attack and kill people, even though all have been filmed in open water by unprotected divers.[55][56] The 2010 French film Oceans shows footage of humans swimming next to sharks in the ocean. It is possible that the sharks can sense the presence of unnatural elements on or about the divers, such as polyurethane diving suits and air tanks, which may lead them to accept the divers as more of a curiosity than prey. Uncostumed humans, however, such as those surfboarding, light snorkeling or swimming, present a much greater area of exposed skin surface to sharks. In addition, the presence of even small traces of blood, recent minor abrasions, cuts, scrapes, or bruises, may lead sharks to attack a human in their environment. Sharks seek out prey through electroreception, sensing the electric fields that are generated by all animals due to the activity of their nerves and muscles.

Most of the oceanic whitetip shark's attacks have not been recorded,[7] unlike the other three species mentioned above. Famed oceanographic researcher Jacques Cousteau described the oceanic whitetip as "the most dangerous of all sharks".[57]

Watson and the Shark by J.S. Copley, based on the attack on Brook Watson in Havana Harbor in 1749

Modern-day statistics show the oceanic whitetip shark as seldom being involved in unprovoked attacks. However, there have been a number of attacks involving this species, particularly during World War I and World War II. The oceanic whitetip lives in the open sea and rarely shows up near coasts, where most recorded incidents occur. During the world wars, many ship and aircraft disasters happened in the open ocean, and because of its former abundance, the oceanic whitetip was often the first species on site when such a disaster happened.

Infamous examples of oceanic whitetip attacks include the sinking of the Nova Scotia, a British steamship carrying 1,000 people that was torpedoed by a German submarine on 18 November 1942, near South Africa. Only 192 people survived, with many deaths attributed to the oceanic whitetip shark.[58] The same species is believed to have been responsible for many of the 600–800 or more casualties following the torpedoing of the USS Indianapolis on 30 July 1945.[59]

Black December refers to at least nine shark attacks on humans, causing six deaths, that occurred along the coast of KwaZulu-Natal Province, South Africa, from 18 December 1957 to 5 April 1958.[60]

In addition to the four species responsible for a significant number of fatal attacks on humans, a number of other species have attacked humans without being provoked, and have on extremely rare occasions been responsible for a human death. This group includes the shortfin mako, hammerhead, Galapagos, grey reef, blacktip, lemon, silky shark, and blue sharks.[6] These sharks are also large, powerful predators which can be provoked simply by being in the water at the wrong time and place, but they are normally considered less dangerous to humans than the previous group.

On the evening of 16 March 2009, a new addition was made to the list of sharks known to have attacked human beings. In a painful but not directly life-threatening incident, a long-distance swimmer crossing the Alenuihaha Channel between the islands of Hawai'i and Maui was attacked by a cookiecutter shark. The two bites were delivered about 15 seconds apart.[61]

* The three most commonly involved sharks
* The great white shark is involved in the most fatal unprovoked attacks[12]

* The tiger shark ranks as the second most fatal in unprovoked attacks[12]

* The bull shark ranks as the third most fatal in unprovoked attacks[12]

## Prevention

[edit]

Main article: Shark attack prevention

### Reducing the risks

[edit]

General advice to reduce risks of being bitten by a shark include:[62]

* Staying in groups, as solitary individuals are more at risk of being bitten
* Only going in the water during the day
* Avoiding areas with a lot of fish or fishers
* Not wearing jewelry, which can create reflections like fish scale
* Avoiding splashes at the surface, because it makes sound which attracts sharks

### Shark barrier

[edit]

Main article: Shark barrier

Coogee Beach shark barrier floats and jetty

A shark barrier (otherwise known as a "shark-proof enclosure" or "beach enclosure") is a seabed-to-surface protective barrier that is placed around a beach to separate people from sharks. Shark barriers form a fully enclosed swimming area that prevents sharks from entering.[63] Shark barrier design has evolved from rudimentary fencing materials to netted structures held in place with buoys and anchors. Recent designs have used plastics to increase strength and versatility.

When deployed in sheltered areas, shark barriers offer complete protection and are seen as a more environmentally friendly option as they largely avoid bycatch. However, barriers are not effective on surf beaches because they usually disintegrate in the swell. Thus, barriers are normally constructed only around sheltered areas such as harbour beaches.[64]

### Shark nets

[edit]

Main article: Shark net

In Australia and South Africa, shark nets are used to reduce the risk of shark attack. Since 1936, shark nets have been used off Sydney beaches.[65] Shark nets are currently installed at beaches in New South Wales and Queensland; 83 beaches are meshed in Queensland compared with 51 in New South Wales.[65][66] Since 1952, nets have been installed at numerous beaches in South Africa by the KwaZulu-Natal Sharks Board.[67][68]

Shark nets do not offer complete protection but work on the principle of "fewer sharks, fewer attacks". They reduce occurrence via shark mortality. Reducing the local shark populations is believed to reduce the chance of an attack. Historical shark attack figures suggest that shark nets and drumlines markedly reduce the incidence of shark attack when regularly and consistently implemented.[69][70]

The downside of shark nets is that they result in bycatch, including threatened and endangered species.[67] Between September 2017 and April 2018, 403 animals were killed in the nets in New South Wales, including 10 critically endangered grey nurse sharks, 7 dolphins, 7 green sea turtles, and 14 great white sharks.[71] Between 1950 and 2008, 352 tiger sharks and 577 great white sharks were killed in the nets in New South Wales. Also during this period, 15,135 marine animals were killed in the nets, including whales, turtles, rays, dolphins, and dugongs.[72] KwaZulu-Natal's net program, operated by the KwaZulu-Natal Sharks Board, has killed more than 33,000 sharks in a 30-year period. During the same 30-year period, 2,211 turtles, 8,448 rays, and 2,310 dolphins were killed in KwaZulu-Natal.[68]

Shark nets have been criticized by environmentalists, scientists, and conservationists, who assert that shark nets harm the marine ecosystem.[68][73][67] In particular, the current net program in New South Wales has been described as being "extremely destructive" to marine life.[74] Sharks are important to the ecosystem and killing them harms the ecosystem.[67][75][76]

### Drum lines

[edit]

Main article: Drum line (shark control)

A drum line is an unmanned aquatic trap used to lure and capture large sharks using baited hooks. They are typically deployed near popular swimming beaches with the intention of reducing the number of sharks in the vicinity and therefore the probability of shark attack. Drum lines were first deployed to protect users of the marine environment from sharks in Queensland, Australia in 1962. During this time, they were just as successful in reducing the frequency of shark attacks as were shark nets.[77][69][78] More recently, drumlines have also been used with great success in Recife, Brazil where the number of attacks has dropped by 97% when the drumlines are deployed.[79] While shark nets and drum lines share the same purpose, drum lines are more effective at targeting the three sharks that are considered most dangerous to swimmers: the bull shark, tiger shark and great white shark.[80] SMART drumlines can also be used to move sharks, which greatly reduces mortality of sharks and bycatch to less than 2%.[81]

Drum lines result in bycatch. For example, in 2015 the non-profit organization Action for Dolphins said about Queensland's shark control program (which uses drum lines):

> "[Data] reveals the ecological carnage of [Queensland's] shark control regime. In total, more than 8,000 marine species with some level of protection status have been caught by the Queensland Shark Control Program, including 719 loggerhead turtles, 442 manta rays and 33 critically endangered hawksbill turtles. More than 84,000 marine animals have been ensnared by drum-lines and shark nets since the program began in 1962 [...] Nearly 27,000 marine mammals have been snared. The state's shark control policy has captured over 5,000 turtles, 1,014 dolphins, nearly 700 dugongs and 120 whales."[82]

Drum lines have been criticized by environmentalists, conservationists and animal welfare activists, who have asserted that drum lines are unethical, non-scientific, and environmentally destructive. They also claim drum lines harm the marine ecosystem.[83][84][85][86][76][87]

### Other protection methods

[edit]

Signs warning of shark attacks at Boa Viagem Beach in Recife, Brazil

Beach patrols and spotter aircraft are commonly used to protect popular swimming beaches. However aerial patrols have limited effectiveness in reducing shark attacks.[88][89] Other methods include shark tagging efforts and associated tracking and notification systems, capture and translocation of sharks to offshore waters, research into shark feeding and foraging behaviour,[90] public shark threat education programs and encouraging higher risk user groups, such as surfers, spear-fishers, and divers, to use personal shark protection technology.[91]

## Media impact

[edit]

The Jersey Shore shark attacks of 1916 killed four people in the first two weeks of July 1916 along the New Jersey shore and Matawan Creek in New Jersey. They are generally credited as the beginning of media attention on shark attacks in the United States of America.[92]

In 2010 nine Australian survivors of shark attacks banded together to promote a more positive view of sharks. The survivors made particular note of the role of the media in distorting the fear of sharks.[93] Films such as Jaws were the cause of large-scale hunting and killing of thousands of sharks.[94] Jaws had a significant impact on people and gave them an unrealistic view of sharks, causing them to fear them more than they probably should. The media has continued to exploit this fear by sensationalizing attacks and portraying sharks as vicious man-eaters.[95] There are some television shows, such as the famous Shark Week, that are dedicated to the preservation of these animals.[96] They demonstrate, through scientific studies, that sharks are not interested in attacking humans and generally mistake humans as prey.

## Notable shark attacks

[edit]

* Tsukumo No. 24 ca. 3000 BCE, world's oldest documented shark attack victim[97]
* George Coulthard (1856–1883), Australian cricketer and Australian rules footballer
* Rodney Fox (b. 1940), Australian filmmaker and conservationist[98][99]
* Bethany Hamilton (b. 1990), American surfer
* Mathieu Schiller (1979–2011), French body-boarder
* Brook Watson (1735–1807), British soldier and Lord Mayor of London
* Mick Fanning (b. 1981), Australian Pro Surfer[100]
* USS Indianapolis July–August 1945
* NOAAS Discoverer (R 102) March 23, 1994
* Tamayo Perry (1975-2024), American professional surfer

## See also

[edit]

Attack sprees

* 2010 Sharm el-Sheikh shark attacks
* Black December
* Jersey Shore shark attacks of 1916

Regions

* List of fatal shark attacks in Australia
* List of fatal shark attacks in the United States
* List of shark attacks in South Africa
* Lists of fatal shark attacks in South Africa
* Red Triangle (Pacific Ocean)
* Shark attacks in Australia
* Shark attacks in South Australia

Other

* Drum lines
* Shark Arm case
* Shark attack prevention
* Shark culling
* Shark net
* Shark repellent
* Summer of the Shark
* Western Australian shark cull

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[edit]

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## External links

[edit]

Wikimedia Commons has media related to Shark attacks.

Classification|

|

* International Shark Attack File
* Global Shark Attack File — Open database
* Tracking Sharks — Current Shark Attack Statistics
* Shark Attack Survivors — Shark attack education and prevention

## Notes

[edit]

1. ^ Excluding Hawaii
2. ^ Excluding Hawaii, Australia and New Zealand

* v
* t
* e

Sharks

Topics|

* Outline of sharks
* Shark anatomy
* Shark tooth
* Egg case (Chondrichthyes)
* Threat display
* Threatened sharks

Taxonomy|

* Carcharhiniformes (Ground sharks)
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* Squaliformes
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* † Cladoselachiformes
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* List of sharks

Human
interaction|

* Shark attack
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* Sharks in popular culture
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Vertebrate|

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Surfing

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Types|

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Surfers|

* American
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Environment|

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Equipment|

* Surfboard
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Locations|

| By country|

* Australia
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|

Sites|

* Banzai Pipeline
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Competitions|

* Australian Boardriders Battle
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* Stubbies
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* Triple Crown of Surfing
* US Open of Surfing
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* World Surf League

Organizations|

* International Professional Surfers
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* Surfline
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* The Moonshine Conspiracy
* Uruguayan Surfing Union
* Welsh Surfing Federation
* World Surf League

Culture|

* Art
* Fictional surfers
* Films
* Hair
* Music
* Surfwear brands
* Shaka sign

Hazards|

* Shark attack
* Surfer's eye
* Surfer's ear
* Surfer's myelopathy

Related topics|

* Surf lifesaving

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