Sharks do not like human meat and generally are not interested in the bodily fluids people excrete. "You can smell a landfill, but it won't make you want to eat it," noted Dr. Steve Kajiura of Florida Atlantic University's Shark Lab.
The lemon shark, for example, can detect a small drop of blood in the water. But they are particular about what they eat. They enjoy munching on bony fish, mollusks, and crustaceans. Sometimes they will eat a seabird or a small shark. Humans are not on the menu.