are there any blind sharks?
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A large, almost-blind shark that lives in the freezing waters of the North Atlantic and Arctic oceans is officially the world's longest-living vertebrate, scientists say. ... Adult Greenland sharks have been measured at more than 6 metres long — and researchers think that they could grow even longer.
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Swordfish are ectothermic animals; however, along with some species of sharks, they have special organs next to their eyes to heat their eyes and brains. ... These include the swordfish, marlin, tuna, and some sharks.
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['Caribbean Reef Shark. via flickr/mattk1979. ... ', 'Nurse Shark. via flickr/Al@in76. ... ', 'Leopard Shark. via flickr/brian.gratwicke. ... ', 'Angel Shark. via flickr/bocagrandelasvegas. ... ', 'Whale Shark.']
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It has been caught as deep as 1,570 m (5,150 ft), although it is uncommon below 1,200 m (3,900 ft). In Suruga Bay, Japan, it is most common at depths of 50–200 m (160–660 ft). Exhibiting several primitive features, the frilled shark has often been termed a living fossil.
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Male sharks tend to be smaller than females. But the easiest way to tell them apart is to look for claspers. Males have a pair of claspers, which are used for mating. This is like a pair of extra roll-up fins under their body.
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In fact, even though sharks live in every ocean in the world, research has shown that up to 70% of oceans are free of sharks.
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There are about forty species of shark in Hawaii, of which eight can be observed near shore, including the reef whitetip, sandbar, scalloped hammerhead and tiger shark, according to the Hawaiian Lifeguard Association. Tiger sharks are the shark species that most often attack humans in Hawaiian waters.
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The diversity of sharks occurring off the Andaman and Nicobar Archipelago in India has received increased attention in recent years. ... These records increase the reported shark species for the archipelago from 47 to 59 and for India from 114 to 116.
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Shark. ... Although there are sharks living within the waters around the Virgin Islands the likelihood of you seeing one is rare. On reef dives and sometimes while snorkeling it is possible to see nurse sharks; most other sharks avoid reefs during the day. Many shark species are shy but occasional attacks do occur.
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The best shark fishing charters on Marco Island. Florida has a wide range of species and subspecies of sharks, but we primarily catch just a few types. The backwaters and the nearshore sea is quite shallow, warm, very murky, and dark; a perfect environment for ambush hunters like sharks.
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['Zebra shark. Length: 2.5 metres (8.2 feet) ... ', 'Blacktip shark. Length: 2.8 metres (9.2 feet) ... ', 'Nurse shark. Length: 3 metres (10.1 feet) ... ', 'Sand tiger shark. ... ', 'Basking shark. ... ', 'Whale shark. ... ', 'Megalodon!']
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Most sharks and rays have five pairs of gill slits, but a few species have 6 or 7 pairs. Shark gill slits lie in a row behind the head. The anterior edge of a gill slit is motile, moving outward to allow water to exit, but closing to prevent reverse flow.
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But that's because it's perfectly adapted to life in the abyss. So called because of the fluffy appearance of its gills, the frilled shark has six gill slits on either side of the head. It's thought to hunt along the seabed using its senses to find its prey, and when it does it lunges at it like a snake.
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An estimated 200 species have been observed in the cold temperate regions, and five species are known to live in the Arctic. The only region where sharks have not been observed is in the Southern Ocean around Antarctica.
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The waters are inhabited by bonefish and barracudas, while stingrays and small lemon sharks can occasionally be sighted. Unfortunately, there are no designated scenic overlooks, public parking, or launching areas for kayaks in Chalk Sound, so it can be difficult to really appreciate the area.
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– Yes, shark sitings like last week's are common, as many shark species make their home in the Gulf of Mexico. In fact, our friend Captain Scott at Little Lagoon Guide Service consistently spots bull sharks, blacktips, and Alabama spinner sharks among others.
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According to the International Union for Conservation of Nature (IUCN), the list of endangered shark species is surprisingly long; among approximately 470 species of sharks, 2.4% are listed as 'Critically Endangered', 3.2% 'Endangered', 10.3% 'Vulnerable', and 14.4% 'Near Threatened'.