08/July/2010 Sharks have been in existence for more than 300 million years. Their evolution occurred over 150 million years earlier than that of the dinosaurs. Most of the existing fossil data of early sharks was collected from fossilized teeth together with several skin impressions. primitive sharks (Cladodonts) ‚ had teeth which were double-pointed‚ up to 2metres in length‚ ate fish as well as crustaceans‚ and existed approximately 360 million years ago. The earliest shark-like beings shown
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Tiger Sharks Rosalani and Romina Mr. Wiscott Modern Hawaiian History May 17‚ 2002 The tiger shark‚ Galeocerdo cuvier‚ is a large (up to 18ft) predator found in tropical and subtropical waters world wide. Tiger sharks are one of the three main shark species known to attack humans‚ and are responsible for most shark attacks in Hawaii. Less than one shark attack occurs per year on average in Hawaii (compared to an annual average of 40 thousand drowning) and mosts attacks are non-fatal
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Who is involved in shark finning‚ and where? Finning occurs worldwide and is most common in high seas fisheries‚ hundreds of miles out to sea. Oceanic fishing fleets target valuable fish such as tuna‚ using thousands of baited hooks on miles of long-line‚ and freezing their catch onboard. Unfortunately‚ long-liners often catch several times as many sharks than they do tuna. Until relatively recently‚ this shark ’bycatch’ was considered a nuisance‚ and sharks were cut loose and allowed to swim away
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that considered a problem in which sharks face regarding humanity killing off their population. After a thorough analysis‚ the simplistic approach of the advertisement makes it highly effective in informing its viewers that humans have an impact on the ecosystem around them without ever explicitly saying it. Taking a first glimpse at the chosen advertisement‚ it is clear that there are two panels‚ one with a shark fin in the ocean‚ and one without the shark fin. It seems that nothing necessarily
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essay on shark finning Issues surrounding shark finning can never be over analysed. At first glance shark finning may seem unenchanting‚ however its study is a necessity for any one wishing to intellectually advance beyond their childhood. While it has been acknowledged that it has an important part to play in the development of man‚ spasmodically it returns to create a new passion amongst those who study its history. It is an unfortunate consequence of our civilizations history that shark finning
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Should we eat sharks’ fins? Shark’s fin soup is a delicacy which is enjoyed by many people around the world‚ especially the Chinese as they believe that it symbolizes wealth‚ honour and respect. However‚ the practice of cutting off sharks’ fins alive and then throwing them back into the sea had caused increasing awareness and ire of animal rights and environment advocates. Statistics have estimated that one hundred million sharks are killed every year‚ not considering the fact that these numbers
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Dog Fish Shark Dogfish sharks are the second largest sharks‚ there body shape is rounded. Dogfish sharks have a variety of different parts. Smell‚ taste‚ hearing‚ sight‚ touch‚ and electroreception are six sensory systems that sharks use. All of there senses allow them to explore the environment and survive. There senses help them locate prey‚ avoid danger‚ and also find mates. Sharks nostrils or nares are under the edge of there snout. There nares are separate from there mouth and throat‚ they
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The Sea The Tiger shark‚ also known as the “wastebasket of the sea”(National Geographic)‚ is the fourth largest predatory shark in the ocean‚ measuring between twenty and twenty five feet long and can weigh more than 2000 pounds. They have dark‚ vertical stripes on their bodies which is the reason they are named tiger sharks. According to National Geographic‚ these stripes fade lighter as the shark grows older‚ and eventually disappears with age. The head of the tiger shark is somewhat wedge-shaped
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Shark Bay Where is it? Shark Bay is the most westerly point of Australia approximately 800km north of Perth in Western Australia. It has the coordinates of 25°30′ S latitude and 113°30′ E longitude. What is it? Shark Bay is a spectacular World Heritage-listed site which encompasses more than 1500km of coastline stretching along two jagged peninsulas and numerous islands. It covers an area covers more than 2.2 million hectares It’s beautiful natural white sand beaches‚ fiery red cliffs
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The goblin shark has a distinctively long and flat snout‚ resembling a sword blade. The proportional length of the snout decreases with age.[17] The eyes are small and lack protective nictitating membranes; behind the eyes are spiracles. The large mouth is parabolic in shape. The jaws are highly protrusible and can be extended almost to the end of the snout‚ though normally they are held flush against the underside of the head. There are 35–53 upper and 31–62 lower tooth rows. The teeth in the main
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