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SCIENCE!!!
http://www.oceanofk.org/Intro/ganatomy/shape_liver.html
SHAPE
Sharks are fast moving predators. Living in the sea, they have streamlined, “torpedo-shaped” bodies for fast swimming. Although some sharks may swim at bursts of over 20 knots (23 miles per hour), most sharks swim very slowly at cruising speeds of less than 5 knots (5.75 miles per hour). Most sharks are characterized by a fusiform body (rounded and tapering at both ends). This streamlined, cylindrical body shape reduces drag and requires a minimum of energy to swim.
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LIVER
A shark's liver is a huge organ which usually amounts to 5-15% of the shark's total body weight. The reason the liver is so large is that it is used for storing fat. Sharks do not have fat anywhere else on their bodies. Fat is stored in the form of oil, often in great quantities. A large tiger shark was found to have a liver containing 18 gallons of oil in its liver! Because of these large oil reserves, sharks’ livers also help to keep them from sinking. Most bony fish have gas-filled swim bladders which give them buoyancy. Sharks do not have swim bladders, but the oil in the liver, which is lighter than water, keeps the shark buoyant, so it does not sink to the bottom.
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