|A sign warning about the presence of sharks off Salt Rock, South Africa|
A shark attack is an attack on a human by a shark. Every year, around 80 unprovoked attacks are reported worldwide. Despite their relative rarity, 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 489 shark species, only three are responsible for a double-digit number of fatal, unprovoked attacks on humans: the great white, tiger, and bull. The oceanic whitetip has probably killed many more castaways, but these are not recorded in the statistics.
|Pacific Islands / Oceania
|Antilles and Bahamas||70||16||2013|
|Unspecified / Open ocean||21||7||1995|
|Sources: Australian Shark Attack File for unprovoked attacks in Australia|
International Shark Attack File for unprovoked attacks in all other regions
In 2000, there were 79 shark attacks reported worldwide, 11 of them fatal. In 2005 and 2006, this number decreased to 61 and 62 respectively, while the number of fatalities dropped to only four per year. 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. By contrast, the 98 shark attacks in 2015, was the highest yearly total on record. 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. In 2016 58% of attacks were on surfers.
Despite these reports, however, the actual number of fatal shark attacks worldwide remains uncertain. For the majority of Third World coastal nations, there exists no method of reporting suspected shark attacks; therefore, losses and fatalities near-shore or at sea often remain unsolved or unpublicized.
Of these attacks, the majority occurred in the United States (53 in 2000, 40 in 2005, and 39 in 2006). The New York Times reported in July 2008 that there had been only one fatal attack in the previous year. On average, there are 16 shark attacks per year in the United States, with one fatality every two years. 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.
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 with total and fatal shark bites growing exponentially over the last 40 years. Since 2000 there have been 15 fatal shark attacks along the West Australian coast with divers now facing odds of one in 16,000 for a fatal shark bite.
Other shark attack hotspots include Réunion Island, Boa Viagem in Brazil, Makena Beach, Maui, Hawaii and Second Beach, Port St. Johns, South Africa. South Africa has a high number of shark attacks along with a high fatality rate of 27 percent.
As of June 28, 1992, Recife in Brazil began officially registering shark attacks on its beaches (mainly on the beach of Boa Viagem). Over more than two decades, 62 victims were attacked, of which 24 died. The last deadly attack occurred on July 22, 2013. The attacks were caused by the species bull shark and tiger shark. What shocks about the shark attacks in Recife is that so many of them are fatal - 21 of the 56, a death 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.
The location with the most recorded shark attacks is New Smyrna Beach, Florida. 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 recorded. In addition to this, individuals and institutions in South Africa, the US 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. In the United States, even considering only people who go to beaches, a person's chance of getting 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 are higher. For example, in the south west of West Australia the chances of a surfer having a fatal shark bite in winter / spring are 1 in 40,000 and for divers it is 1 in 16,000. In comparison to the risk of a serious or fatal cycling accident, this represents 3 times the risk for a surfer and 7 times the risk for a diver.
Species involved in incidents
Only a few species of shark 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; however, the oceanic whitetip has probably killed many more castaways which have not been recorded in the statistics. These sharks, being large, powerful predators, may sometimes attack and kill people; however, they have all been filmed in open water by unprotected divers. The 2010 French film Oceans shows footage of humans swimming next to sharks in the ocean. It is possible that the sharks are able to 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 temporary outsiders 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, unlike the other three species mentioned above. Famed oceanographic researcher Jacques Cousteau described the oceanic whitetip as "the most dangerous of all sharks".
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 November 18, 1942, near South Africa. Only 192 people survived, with many deaths attributed to the oceanic whitetip shark. The same species is believed to have been responsible for many of the 60–80 or more shark casualties following the torpedoing of the USS Indianapolis on July 30, 1945.
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 December 18, 1957, to April 5, 1958.
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, gray reef, blacktip, lemon, silky shark and blue sharks. 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, delivered about 15 seconds apart, were not immediately life-threatening.
The great white shark is is involved in the most fatal unprovoked attacks
Types of attacks
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; these incidents are considered to be a separate category. Postmortem scavenging of human remains (typically drowning victims) are also not accorded "provoked" or "unprovoked" status. The GSAF categorizes scavenging bites on humans as "questionable incidents." The most common criteria for determining "provoked" and "unprovoked" attacks are discussed below:
Provoked attacks occur when a human touches a shark, pokes it, teases it, spears, hooks or nets it, or otherwise aggravates/provokes the animal in a certain manner. Incidents that occur outside of a shark's natural habitat, e.g., 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.
- 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.
- 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 attempting 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.
An incident occurred in 2011 when a 3-meter long 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 the incident was judged to be an accident.
Reasons for attacks
Large sharks species are apex predators in their environment, and thus have little fear of any creature (other than orcas) 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. Generally, shark bites are exploratory, and the animal will swim away after one bite. For example, exploratory bites on surfers are thought to be caused by the shark mistaking the surfer and surfboard for the shape of prey. 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.
Feeding is not the reason sharks attack humans. In fact, humans do not provide enough high-fat meat for sharks, which need a lot of energy to power their large, muscular bodies.
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; however, it also allows humans time to get out of the water and survive. Shark attacks may also occur due to territorial reasons or as dominance over another shark species, resulting in an attack.
Sharks are equipped with sensory organs called the Ampullae of Lorenzini that detect the electricity generated by muscle movement. The shark's electrical receptors, which pick up movement, detect signals like those emitted from fish wounded, for example, by someone who is spearfishing, leading the shark to attack the person by mistake. George H. Burgess, director of the International Shark Attack File, said the following regarding why people are attacked: "Attacks are basically an odds game based on how many hours you are in the water".
In Australia and South Africa shark nets are used to reduce the risk of shark attack. Since 1936 sharks nets have been utilised off Sydney beaches. 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. Since 1952, nets have been installed at numerous beaches in South Africa by the KwaZulu-Natal Sharks Board.
Shark nets do not offer complete protection but work on the principle of "fewer sharks, fewer attacks". They reduce occurrence via shark mortality. Shark nets such as those in New South Wales are designed to entangle and kill sharks and other animals that pass near them. Reducing the local shark populations is believed to reduce the chance of an attack. Historical shark attack figures suggest that the use of shark nets and drumlines does markedly reduce the incidence of shark attack when implemented on a regular and consistent basis. However, it has been argued that shark nets do not protect swimmers.
The downside with shark nets is that they do result in bycatch, including threatened and endangered species. 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. 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, a total of 15,135 marine animals were killed in the nets, including whales, turtles, rays, dolphins, and dugongs. 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.
Shark nets have been criticized by environmentalists, scientists, and conservationists; they say shark nets harm the marine ecosystem. In particular, the current net program in New South Wales has been described as being "extremely destructive" to marine life. Sharks are important to the ecosystem and killing them harms the ecosystem.
A drum line is an unmanned aquatic trap used to lure and capture large sharks using baited hooks — in some places, such as Queensland, the sharks are killed. Drum lines 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 in Queensland, Australia in 1962. During this time, they were just as successful in reducing the frequency of shark attacks as the shark nets. More recently, drum lines have also been used with great success in Recife, Brazil where the number of attacks has been shown to have reduced by 97% when the drum lines are deployed (the purpose of the Recife program was to relocate sharks). Drum lines are currently used in Queensland. Between 2001 and 2018, a total of 10,480 sharks were killed on lethal drum lines in Queensland (as part of a shark cull). Between 1962 and 2018, roughly 50,000 sharks were killed by Queensland authorities.
Drum lines result in bycatch; for example, in 2015 the following was 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."
Drum lines have been criticized by environmentalists, conservationists and animal welfare activists — they say drum lines are unethical, non-scientific, and environmentally destructive; they also say drum lines harm the marine ecosystem. The current drum line program in Queensland has been called "outdated, cruel and ineffective".
Other protection methods
Beach patrols and spotter aircraft are commonly used to protect popular swimming beaches. However aerial patrols have limited effectiveness in reducing shark attacks. 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, public shark threat education programs and encouraging higher risk user groups (surfers, spear-fishers and divers) to use personal shark protection technology.
The Jersey Shore shark attacks of 1916 killed 4 people in the first 2 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.
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. Films such as Jaws were the cause of large-scale hunting and killing of thousands of sharks. 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 over the years by sensationalizing attacks and portraying sharks as vicious man-eaters. There are some television shows, such as the famous Shark Week, that are dedicated to the preservation of these animals. They are able to prove through scientific studies that sharks are not interested in attacking humans and generally mistake humans as prey.
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The 2016 yearly total of 84 unprovoked attacks was on par with our most recent five-year (2011–2015) average of 82 incidents annually.
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- International Shark Attack File
- Global Shark Attack File — Open database
- Peoples Shark Attack File — Online Searchable Open database
- Australian Shark Attack File
- Australasian Shark Attack File — Open database
- Shark Attack Survivors — Shark attack education and prevention
- Shark attack information, statistics, and pictures
- Swim At Your Own Risk — Shark attack news and photos
- Shark Attack News — Shark news, videos & pics
- Shark Attack Data — Database of shark attacks, based on the Shark Research Institute's Global Shark Attack File