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Transcript of SHARKS
5 - 15 are fatal Florida's Volusia County is "the shark attack capital of the world"
accounted for 21% of attacks 1999 - 2008 most attacks are from great whites, bull sharks, and tiger sharks 73 million sharks are killed by humans each year
more than 8,333 sharks killed an hour sharks are fished for their fins, which are a main ingredient in shark fin soup, a delicacy in Asia that costs $100 a bowl the sharks' fins are often cut off while they are still alive and the shark is thrown back into the water to die a slow death ecotourism one dead whale shark is worth $600 - $3,000 as food
one whale shark is worth $250,000 in tourism or the populations of smooth hammerheads, bull, and dusky sharks on the U.S. east coast have fallen 99% from 1970 to 2005 Palau is the first nation to ban all commercial shark fishing its 230,000 square miles of territorial waters is now a shark sanctuary hammerheads gather in large schools at certain times of the year for unknown purposes pilot fish follow in the slipstream of sharks and eat their leftovers
other fish latch on to sharks and eat parasites feeding great whites eating seals off the coast of South Africa apex predators when adults
usually no natural enemies cartilaginous skeleton except for teeth teeth in rows
when a tooth is lost or broken, a new one moves forward to replace it in a few days while most sharks feed on large prey, some only eat krill or plankton often gorge when they can and survive off fat reserves regulating/ending shark fishing,protecting shark feeding grounds, and increasing shark tourism could all help to reatore shark populations Pictures
http://www.youtube.com/watch?v=aMnnI1DcMfk By Jay Harvey Du Plessis, Amelia. "Sharks - Senses." Sharks. www.sharks.org.za , 2011. Web. 1 Jun 2011. <http://www.sharks.org.za/senses.html>.
"Mythbusters Results." Discovery Channel. Discovery Communications, LCC, 2011. Web. 12 Jun 2011. <http://dsc.discovery.com/fansites/mythbusters/db/myth-files.html>.
"Shark." Encyclopedia of the Aquatic World. vol 9. Tarrytown, NY: Marshall Cavendish, 2004. Print.
"Shark Week." Discovery Channel. Discovery Communications, LLC, 2011. Web. 1 Jun 2011. <http://dsc.discovery.com/tv/shark-week/>. electromagnetic sense detects electrical pulses of other animals' muscle movement
uses electromagnetic field for navigation adapted for murky, dark habitat
can see by starlight
can see in color, but are more senistive to changes in light
sightline spans nearly 360 degrees
sharks in cold waters have an organ that heats their eyes so they may continue to hunt in extreme temps. taste buds all around the shark's mouth, opposed to just on tounge can smell blood 2.5 miles away smells as little as 1 drop of blood in an Olympic-sized pool network of receptors called the lateral line system that detect sound and vibrations at a long distance Goblin Shark Frill Shark Gray Reef Shark Basking Shark Whale Shark Great White Shark Great Hammerhead Shark Chain Catshark over 440 known species Why did I choose sharks? because I have always been curious about sharks I didn't know that much about them besides what I've seen on Shark Week Tiger Shark sharks are really cool Experiments 2 experiments involving sharks sharks have been on Earth for about 400,000,000 years, so something unnatural must be occuring to make their populations fall now humans have been around for only 200,000 years modern sharks appeared 180 million years ago overfishing kills sharks' prey
pollution destroys pupping grounds and feeding areas Overview Anatomy
Activity Most information and photos from the Discovery Channel website for Shark Week Shark Facts tiger sharks may replace 24,000 teeth in just 10 years the largest great whites need to eat about 11 tons of meat a year tiger sharks often eat indigestible objects including paint cans, clothes, tires, oil drums, wire, license plates, and anchors the megalodon, which lived 25 to 10 million years ago, had 7 inch teeth and were longer than 50 feet in the sinking of the USS Indianapolis during WWII, only 316 of the 900 man crew survived, most were believed to be eaten by sharks baby sharks are known as pups Will playing dead help you survive a shark attack? the test:
2 mythbusters donned shark-resistant chain mail and entered shark-infested waters
1 thrashed around while the other remained still and the sharks only attack the person moving
The two switched roles and the experiment proved the same results
the myth was confirmed Do flashlights attract sharks? during WWII, a navy sailor survived for five days in shark-infested waters and claimed it was because he played dead scuba divers have reported that their flashlights attract nearby sharks because they mistake the light's electromagnetic field with that of their prey the test:
several mythbusters entered the water at night without flashlights and encountered 6 sharks
the next night, they went in the water at the same spot, but this time with flashlights, and attracted so many sharks that they had to get out of the water for safety uses
the myth was confimed Shortfin Mako Shark 6 feet 23 feet 20 feet 46 feet 8 feet 5 feet 60 feet 33 feet Spiny Dogfish Shark 4 feet Lemon Shark 10 feet 11 feet