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Shark has over streamed bodies. In this over streamed bodies, it has fully cartilaginous skeletons. Sharks have five to seven gills for respiration. Their skin has an outer protection called dermal denticles. This improves the fluid dynamics of the shark. Nowhere is this more evident than in the recent developments for the field of shark conservation. Although they are more likely to be reviled as savage predators of the sea due to popular movies such as 'Jaws' and newspaper reports eager to print stories concerning attacks on surfers and the latest tourist scares, sharks are gaining a newfound acceptance for their ecological role, and recent conservation measures have only served to reinforce this attitude. More than 70 million sharks are killed every year for their fins, which end up as an ingredient in soups. If the current rate of death continues, nearly a third of all shark species on the planet may soon be faced with extinction. As those conducting work with animal researchers have hypothesised, the loss of these predators would have an incredible impact all the way down the ocean's food chain.
Sharks also prey on a lot of other fishes in the ocean. But no matter how aggressive and dangerous they look, there is one thing that sharks can not eat. That is a puffer fish. A puffer fish bloats like a balloon as a defense mechanism when they sense an imbalance in their surroundings. Its sharp needles hurt the mouth of a shark when they are swallowed. The sharks have Ampullae of Rorenzini, which is an electro receptor organ. This receptor organ alerts or gives them a keen feeling of vibration whenever there is potential prey. Another thing that one should know is that sharks have great listening abilities that it can hear the sound of the prey even if the prey are miles away. Great White Shark cages are the workhorses of the industry as they spend the most time in the water on the front lines. Couple that with the fact that the cages are where the average shark diver spends most of his or her time and the need for safety, reliability and comfort becomes apparent.
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