Sharks

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Shark Cartilage Shark cartilage has been investigated as treatments for cancer, psoriasis, arthritis, and a number of other medical conditions for more than 30 years. At least some of the interest in cartilage as a treatment for cancer arose from the mistaken belief that sharks, whose skeletons are made primarily of cartilage, are not affected by this disease. Although reports of malignant tumours in sharks are rare, a variety of cancers have been detected in these animals. Nonetheless, several substances that have anti-tumour activity have been identified in cartilage. The major structural components of cartilage include several types of the protein collagen and several types of glycosaminoglycans, which are polysaccharides. Chondroitin sulphate is the major glycosaminoglycan in cartilage. Although there is no evidence that the collagens in cartilage, or their breakdown products, can inhibit angiogenesis, there is evidence that shark cartilage contains at least one angiogenesis inhibi...

Zebra shark Zebra sharks are found in the Pacific Ocean, between Japan and Australia and in the Indian Ocean, between the Red Sea and Australia. Zebra sharks live in tropical waters and inhabit sandy or coral bottoms between 0 - 206 feet (0 - 63 metres) deep. They are usually encountered by divers while resting on the bottom and can sometimes be seen swimming slowly (particularly at night). Zebra sharks mainly feed on mollusks, crustaceans, and small bony fish. Their flexible body allows them to work their way into narrow coral channels and crevices to search for food. Zebra sharks live to approximately 9 years when held in small tanks and up to 25 years when held in large aquarium tanks. It is believed that they live to 30 years in the wild. Zebra sharks may be vulnerable to other large sharks, but are most threatened by humans. Zebra shark