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Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and they have pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha and are the sister group to the Batoidea. Some sources extend the term "shark" as an informal category including extinct members of Chondrichthyes with a shark-like morphology, such as hybodonts. Shark-like chondrichthyans such as Cladoselache and Doliodus first appeared in the Devonian Period, though some fossilized chondrichthyan-like scales are as old as the Late Ordovician. The earliest confirmed modern sharks (selachimorphs) are known from the Early Jurassic around 200 million years ago, with the oldest known member being Agaleus, though records of true sharks may extend back as far as the Permian.
The great white shark, 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 (4,400 lb) in weight at maturity. However, most are smaller; males measure 3.4 to 4.0 m, and females measure 4.6 to 4.9 m on average. 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, making it one of the longest lived cartilaginous fishes currently known. 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. Great white sharks can swim at speeds of 25 km/h (16 mph) for short bursts and to depths of 1,200 m (3,900 ft).
The tiger shark is a species of ground shark, and the only extant member of the genus Galeocerdo and family Galeocerdonidae. It is a large macropredator, with females capable of attaining a length of over 5 m. Populations are found in many tropical and temperate waters, especially around central Pacific islands. Its name derives from the dark stripes down its body, which resemble a tiger's pattern, but fade as the shark matures.
A shark attack is an attack on a human by a shark. Every year, around 80 unprovoked attacks are reported worldwide. Despite their 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 500 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 shipwreck and plane crash survivors, but these are not recorded in the statistics. 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.
A shark net is a submerged section of gillnets placed at beaches designed to intercept large marine animals including sharks, with the aim to reduce the likelihood of shark attacks on swimmers. Shark nets used are gillnets which is a wall of netting that hangs in the water and captures the marine animals by entanglement, however only around 10% of catch is the intended target shark species. The nets in Queensland, Australia, are typically 186m long, set at a depth of 6m, have a mesh size of 500mm and are designed to catch sharks longer than 2m in length. The nets in New South Wales, Australia, are typically 150m long, set on the sea floor, extending approximately 6m up the water column, are designed to catch sharks longer than 2m in length. Shark nets do not create an exclusion zone between sharks and humans, and are not to be confused with shark barriers.
Great White is a 1981 Italian horror film directed by Enzo G. Castellari, having originally been assigned to Ruggero Deodato. In the film James Franciscus and Vic Morrow attempt to save hundreds of swimmers in a coastal resort after a large great white shark starts terrorizing the area and eating tourists.
Lesbian, gay, bisexual, transgender, and queer (LGBTQ) personnel are able to serve in the armed forces of some countries around the world: the vast majority of industrialized, Western countries including some South American countries, such as Argentina, Brazil and Chile in addition to other countries, such as the United States, Canada, Japan, Australia, Mexico, France, Finland, Denmark and Israel. The rights concerning intersex people are more vague.
The Jersey Shore shark attacks of 1916 were a series of shark attacks along the coast of New Jersey, in the United States, between July 1 and 12, 1916, in which four people were killed and one critically injured. The incidents occurred during a deadly summer heat wave and polio epidemic in the United States that drove thousands of people to the seaside resorts of the Jersey Shore. Since 1916, scholars have debated which shark species was responsible and the number of animals involved, with the great white shark and the bull shark most frequently cited.
Culling is the process of segregating organisms from a group according to desired or undesired characteristics. In animal breeding, it is removing or segregating animals from a breeding stock based on a specific trait. This is done to exaggerate desirable characteristics, or to remove undesirable characteristics by altering the genetic makeup of the population. For livestock and wildlife, culling often refers to killing removed animals based on their characteristics, such as their sex or species membership, or as a means of preventing infectious disease transmission.
Rodney Winston Fox is an Australian film maker, conservationist, survivor of an attack by a great white shark, and one of the world's foremost authorities on that species. He was inducted into the International Scuba Diving Hall of Fame in 2007. He was born in Adelaide.
The Australian Christian Lobby (ACL) is a conservative right-wing Christian advocacy organisation based in Canberra.
Jaws is a novel by American writer Peter Benchley, published in 1974. It tells the story of a large great white shark that preys upon a small Long Island resort town and the three men who attempt to kill it. The novel grew out of Benchley's interest in shark attacks after he read about the exploits of Frank Mundus, a shark fisherman from Montauk, New York, in 1964. Doubleday commissioned him to write the novel in 1971, a period when Benchley worked as a freelance journalist.
The environmental impact of fishing includes issues such as the availability of fish, overfishing, fisheries, and fisheries management; as well as the impact of industrial fishing on other elements of the environment, such as bycatch. These issues are part of marine conservation, and are addressed in fisheries science programs. According to a 2019 FAO report, global production of fish, crustaceans, molluscs and other aquatic animals has continued to grow and reached 172.6 million tonnes in 2017, with an increase of 4.1 percent compared with 2016. There is a growing gap between the supply of fish and demand, due in part to world population growth.
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 are often used in association with shark nets, which results in shark mortality. However SMART drum lines can be used to move sharks, which greatly reduces shark and bycatch mortality. The use of drum lines has been successful in reducing shark attacks in the areas where they are installed. The topic of shark culling became an international controversy and sparked public demonstrations and vocal opposition, particularly from environmentalists, animal welfare advocates and ocean activists.
The Western Australian shark cull is the common term for a former state government policy of capturing and killing large sharks in the vicinity of swimming beaches by use of baited drum lines. The policy was implemented in 2014 to protect human swimmers from shark attack following the deaths of seven people on the Western Australian coastline in the years 2010 to 2013. National public demonstrations opposing the policy attracted international attention to the issue. In September 2014 the seasonal setting of drum lines was abandoned following a recommendation made by the Western Australian Environment Protection Authority. From December 2014 to March 2017, the special deployment of drum lines was permitted in cases where sharks were deemed to present a serious threat to public safety. This policy allowed the government of Western Australia to kill "high-hazard" sharks it found to be a threat to humans; the policy was criticized by senator Rachel Siewart for damaging the environment. In March 2017 the use of drum lines was abandoned by the newly elected West Australian state government. In August 2018 following continual shark attacks the West Australian state government reversed their position and announced a 12-month trial of "SMART" drumlines along Western Australia's South West coast, near Gracetown.
A total of 24 people have been killed by sharks in South Australian waters since the establishment of the colony in 1836. Prior to 2014, there had been 82 recorded shark attacks in South Australia. 20 of those have involved a single fatality. Victims were involved in a range of aquatic activities, including surfing, diving, spear-fishing, snorkeling, boating and swimming. Six of the fatalities occurred off the coast of greater metropolitan Adelaide, with the remainder distributed across South Australia's extensive coastline. Many of the fatal attacks have been attributed to great white sharks.
A shark barrier is seabed-to-surface protective barrier that is placed around a beach to protect people from shark attacks. Often confused with shark nets, shark barriers form a fully enclosed swimming area that prevents sharks from entering. 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, versatility and to reduce the environmental damage of bycatch.
There are a range of shark attack prevention techniques employed to reduce the risk of shark attack and keep people safe. They include removing sharks by various fishing methods, separating people and sharks, as well as observation, education and various technology-based solutions.
Shark culling is the deliberate killing of sharks by government authorities, usually in response to one or more shark attacks. The term "shark control" is often used by governments when referring to culls. Shark culling has been criticized by environmentalists, conservationists and animal welfare advocates—they say killing sharks harms the marine ecosystem and is unethical. Government officials often cite public safety as a reason for culling. The impact of culling is also minor compared to bycatch with 50 million sharks caught each year by the commercial fishing industry.
Galeophobia is the medical term for a fear of sharks. The name galeophobia derives from the Greek language with galeos meaning shark and phobia meaning fear. This phobia is diagnosed using DSM-5 criteria and is characterized by a patient showing marked fear or anxiety about sharks that leads to severe impairment of their quality of life. Although it is not known exactly how many people have been diagnosed with galeophobia, a study conducted in 2015 revealed that just over half (51%) of Americans are absolutely terrified of sharks.
References
- ↑ Bezerra, Chord (28 May 2003). "Day of Tribute". Metro Weekly .
- ↑ Techera, Erika J.; Klein, Natalie (5 June 2014). Sharks: Conservation, Governance and Management. Routledge. ISBN 978-1-135-01261-8.
- ↑ "USYD Thesis - The Politics of Shark Attacks: Explaining policy responses following shark bites in Florida, Cape Town, and New South Wales". sydney.primo.exlibrisgroup.com.
- ↑ "Staff Profile - Dr Christopher Neff - Senior Lecturer in Public Policy". The University of Sydney .
- ↑ McDonald, Shae (25 November 2014). "Calls mount for useless shark nets to be removed". Daily Telegraph .
- ↑ Sparks, Hannah (15 July 2021). "Shark advocates call for rebranding violent attacks as 'interactions'". New York Post .
- ↑ Fears, Darryl (4 February 2013). "Sharks' reputation as man-eaters is unfair and threatens the species, authors say". Washington Post .
- ↑ Pash, Chris (December 9, 2014). "Australia's Shark Policies Were Massively Shaped By 'Hollywood Fiction' From The Movie 'Jaws'". Business Insider .
- ↑ University of Sydney. "The public fear sharks less when they understand their behaviour". phys.org.
- ↑ Staff (April 9, 2014). "Australian shark fear survey shows little support for culling". Times of Malta .
- ↑ Woods, Al. "The Power of Lobbying: The Story of a Movement for Gay Rights and Policies". Flux magazine .
- ↑ "City Council Takes On Don't Ask, Don't Tell". Gay City News.
- ↑ "Christopher Pepin-Neff". scholar.google.com.
- ↑ "Christopher Pepin-Neff Research". ResearchGate.
- ↑ Pepin-Neff, Christopher L. (2021). LGBTQ Lobbying in the United States. Routledge. ISBN 978-0-367-77222-2.
- ↑ Pepin-Neff, Christopher L. (20 February 2019). Flaws: Shark Bites and Emotional Public Policymaking. Springer. ISBN 978-3-030-10976-9.
