Shark's most sense is smell, it is so powerful that sharks are able to sniff a tea spoon of blood in a Olympic swimming pool, sharks can smell blood from up to 100 meters or more away. Once the shark identifies the scent and decides to pursue, it starts swimming. The shark's natural swimming motion of moving its head back and forth provides further assistance in determining where the scent is coming from. With each movement, the snout picks up more water for the shark to analyze, and the shark is able to tell whether it's coming from the right or left nare. This helps them determine which way to swim. The shark's nose may work so well because it doesn't have to do anything else. Sharks use their noses just for smelling. Breathing is accomplished with a shark's gills, and the shark's sense of smell is not connected to its mouth in any way. Sharks often don't know how something is going to taste until they've taken a bite.
bibliography:
http://animals.howstuffworks.com/fish/shark-senses1.htm
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