Sharks can smell blood in a maximum of 100 liters of water. Even a faint hint of odor is enough to alert a shark to the presence of prey. So I went to the Bahamas in shark infested waters and set up an experiment to get to the bottom of things. Sharks are the most mysterious and slandered creatures of the ocean. However, the scent of blood does not reach them right away. Any bodily fluid released into the water is likely detectable by sharks. The goal was to test how far sharks could smell a single drop of blood in the water. Menstrual blood in the water could be detected by a shark, just like any urine or other bodily fluids. If we all close our eyes and imagine a shark encounter, we’d likely picture the exact same scene: it begins with a drop of blood leaking from your finger and diffusing into the salty water. In this article, we’ll look at if sharks can smell blood in water. Within a matter of seconds, a sharp fin slices through the midnight blue waves, following the scent of blood. A shark’s sense of smell is powerful – it allows them to find prey from hundreds of yards away. Sharks are famous for their acute and superior sense of smell. This question originally appeared on Quora. How do sharks smell blood? Do sharks smell period blood? The smell of sharks can feel the only drop of blood dissolved in a million drops of water. Their ability to smell the smallest traces of blood dispersed within gallons and gallons of seawater has long been a source of fear and dread amongst swimmers and surfers. The belief that sharks can smell a drop of blood in the ocean, is vastly exaggerated. Not only blood, but they can also smell anything within the parameter. Sharks can smell blood up to 1 mile away. But before that, Rober needed to know that they actually preferred blood over any other scent. Photo by Ethan Miller/Getty Images for CineVegas. For several hundred million years of existence, they have only slightly changed over the past ten million years. In fact, scientists think sharks can smell 1 drop of blood a quarter of a mile away. Some sharks, such as the lemon shark (Negaprion brevirostris), can detect a small amount of blood in the water. So, sharks can’t smell a drop of blood a mile away, but one thing they’re pretty good at is detecting low concentrations of odors that indicate the presence of prey—not just blood, but all kinds of organic molecules. Lastly, neither does it always cause them to attack their prey. Do sharks really smell blood? Smell is probably the most important shark sense, so much so that sharks have been referred to as "swimming noses" [source: SeaWorld].There are some impressive statistics to back this up, too. 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