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Erleben Sie die Reinigungskraft der kabellosen Staubsauger von Shark. Innovative Reinigungstechnologien und lange Akkulaufzeiten treffen auf unbegrenzte. Für Pro s, die im Meer und an der Küste tätig sind, oder Wassersportfreunde: SHARK-X3 ist das wasserdichte Mobiltelefon, das für all Ihre Aktivitäten geeignet​. SHARKPROJECT is an organisation dedicated to the protection of sharks and, about our largest food reservoir, the ocean, and its top predator, the shark. Alopias Pelagic thresher A. The upper and lower Handballmannschaft on the tail fin are approximately the same size which is similar to some mackerel sharks. The great white shark was one of the many amphibia originally described by Linnaeus in the landmark 10th edition of his Systema Naturae[20] its first scientific just click for source, Shark carcharias. Fishery Bulletin. Megamouth shark M. National Geographic : CITES Huntington Beach Wave. Shark

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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. 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. 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.

The seals swim on the surface and the great white sharks launch their predatory attack from the deeper water below.

Just under half of observed breach attacks are successful. 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.

Interspecific competition between the great white shark and the orca is probable in regions where dietary preferences of both species may overlap.

An estimated 4. The orca then proceeded to eat the dead shark's liver. Studies published in of killer whale and great white shark distribution and interactions around the Farallon Islands indicate that the cetaceans impact the sharks negatively, with brief appearances by killer whales causing the sharks to seek out new feeding areas until the next season.

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 s to the present.

No accurate global population numbers are available, but the great white shark is now considered vulnerable. The IUCN 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.

Burgess , Florida Museum of Natural History , University of Florida , there are about 2, great white sharks near the California coast, which is 10 times higher than the previous estimate of by Barbara Block.

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.

The great white shark was declared Vulnerable by the Australian Government in because of significant population decline and is currently protected under the Environmental Protection and Biodiversity Conservation EPBC Act.

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.

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.

In , 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.

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.

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.

The Australasian population of great white sharks is believed to be in excess of 8,—10, individuals according to genetic research studies done by CSIRO , with an adult population estimated to be around 2, 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.

The species meets the criteria for this classification as there exists a moderate, stable population of between and mature individuals.

This classification has the qualifiers "Data Poor" and "Threatened Overseas". In , 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 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.

A study estimated the population of great white sharks along the California coastline to be approximately 2, In 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. Of all shark species, the great white shark is responsible for by far the largest number of recorded shark bite incidents on humans, with documented unprovoked bite incidents on humans as of More than any documented bite incident, Peter Benchley 's best-selling novel Jaws and the subsequent film adaptation directed by Steven Spielberg provided the great white shark with the image of being a " man-eater " in the public mind.

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.

Contrary to popular belief, great white sharks do not mistake humans for seals. 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. 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 to there have been a total of unprovoked great white shark bite incidents, 29 of which were fatal. However, some researchers have hypothesized that the reason the proportion of fatalities is low is not because sharks do not like human flesh, but because humans are often able to escape after the first bite.

In the s, John McCosker, Chair of Aquatic Biology at the California Academy of Sciences , noted that divers who dove 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.

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".

Great white sharks are currently killed in both Queensland and New South Wales in "shark control" shark culling programs. From to , Queensland authorities killed about 50, sharks, many of which were great whites.

KwaZulu-Natal an area of South Africa also has a "shark control" program that kills great white sharks and other marine life.

In a year period, more than 33, sharks were killed in KwaZulu-Natal's shark-killing program, including great whites. In 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 — Large sharks found hooked but still alive were shot and their bodies discarded at sea.

Great white sharks infrequently bite and sometimes even sink boats. Only five of the authenticated unprovoked shark bite incidents reported from the Pacific Coast during the 20th century involved kayakers.

They have bumped or knocked people overboard, usually biting the boat from the stern. In one case in , 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 near-by.

Prior to August , no great white shark in captivity lived longer than 11 days. Monterey Bay Aquarium first attempted to display a great white in , but the shark died after 11 days because it did not eat.

They had the rare success of getting the shark to feed in captivity before its release. A young female, which was caught off the coast of Ventura , was kept in the aquarium's 3.

She was tracked for 30 days after release. He was released on 16 January , after days in captivity. Monterey Bay Aquarium housed a third great white, a juvenile male, for days between 27 August , and 5 February On arrival, he was 1.

He grew to 1. A juvenile female came to the Outer Bay Exhibit on 27 August While she did swim well, the shark fed only one time during her stay and was tagged and released on 7 September Another juvenile female was captured near Malibu on 12 August , introduced to the Outer Bay exhibit on 26 August , and was successfully released into the wild on 4 November The animal was captured in the waters off Malibu.

One of the largest adult great whites ever exhibited was at Japan's Okinawa Churaumi Aquarium in , where a 3. She was released because she would not eat and constantly bumped against the walls.

Cage diving is most common at sites where great whites are frequent including the coast of South Africa, the Neptune Islands in South Australia, [] and Guadalupe Island in Baja California.

The popularity of cage diving and swimming with sharks is at the focus of a booming tourist industry. 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. Companies object to being blamed for shark bite incidents, pointing out that lightning tends to strike humans more often than sharks bite humans.

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. The shark tourist industry has some financial leverage in conserving this animal.

That is a fraction of the tourism value of a live shark; tourism is a more sustainable economic activity than shark fishing.

For example, the dive industry in Gansbaai , South Africa consists of six boat operators with each boat guiding 30 people each day.

Putting chum in the water. From Wikipedia, the free encyclopedia. For other uses of "great white", see Great White disambiguation.

For the novel, see White Shark novel. Species of large lamniform shark. Conservation status. Linnaeus , Great white shark near Gansbaai , showing upper and lower teeth.

Main article: Shark attack. Main article: shark culling. Play media. Tourists in a cage near Gansbaai. Sharks portal. Journal of Vertebrate Paleontology.

Retrieved 19 December The Guardian. Retrieved 3 June Discovery Channel. Retrieved 19 January Animal Diversity Web. Retrieved 5 June Science Daily.

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Archived from the original on 26 April Retrieved 2 May I 10th revised ed. Holmiae : Laurentii Salvii. The Enviro Facts Project. Archived from the original on 13 June Retrieved 9 July Caribbean Journal of Science.

University of Florida. Archived from the original PDF on 16 December Retrieved 25 December National Capital Freenet. Retrieved 16 October The status of the great white shark Carcharodon carcharias in Turkey's waters pdf.

Marine Biodiversity Records. South African Journal of Wildlife Research. Retrieved 22 May White Shark Trust. Los Angeles Times.

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California Academy of Sciences. Great White Shark. Retrieved 16 May Archived from the original on 6 January University of Hawaii Press.

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The largest among the more predatory species is the voracious 6-metre foot white shark , which attacks seals , dolphins , sea turtles , large fish, and occasionally people.

The more sluggish Greenland shark Somniosus microcephalus of cold deep waters feeds on seals, large fish, and even swimming reindeer; they may also scavenge whale carcasses.

Normally, sharks feed on fish, often attacking in schools. Open-ocean species such as the mackerel Lamna , mako Isurus , and thresher Alopias sharks frequently feed near the surface and are much sought after with rod and reel for sport.

Beautifully streamlined and powerful swimmers, those open-ocean sharks are adept at feeding on fast tuna , marlin , and the like.

Bottom-feeding species of sharks are stout, blunt-headed forms that tend to have more-sluggish habits. The shellfish eaters among them have coarse, pavementlike, crushing teeth.

Fertilization in sharks is internal. The male introduces sperm into the female by using special copulatory organs claspers derived from the pelvic fins.

The young in many species hatch from eggs within the female and are born alive. Other species may lay eggs or nurture their young in the uterus with a placental attachment to the mother, like humans.

Some species may even consume their siblings before they are born. The origin of sharks is obscure, but their geologic record goes back at least to the Devonian Period Fossil sharklike fish appeared in the Middle Devonian Epoch and became the dominant vertebrates of the Carboniferous Period Modern sharks appeared in the Early Jurassic Epoch Overall, evolution has modified shark morphology very little except to improve their feeding and swimming mechanisms.

Shark teeth are highly diagnostic of species, both fossil and modern. Their extensive movements are related to reproductive or feeding activities or to seasonal environmental changes.

Tagging returns from large sharks on the east coast of the United States indicate regular movements between New Jersey and Florida, and blue sharks have been recovered after crossing the southern Atlantic Ocean.

A tagged spiny dogfish Squalus acanthias was recovered after traveling about 1, km 1, miles in days. Advances in tracking technologies include the use of satellite tags that continuously beam a signal to orbiting satellites whenever the shark surfaces and in that manner reveal north-south movements, transoceanic movements, and roaming and migratory patterns that are beginning to be understood for many species.

Some members of the Carcharhinus genus—most notably the bull shark C. Riverine sharks are small to medium-sized and are exceptionally voracious and bold.

Article Media. Info Print Print. Table Of Contents. Submit Feedback. Thank you for your feedback. Introduction Description and habits Shark behaviour Hazards to humans Shark finning.

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