There's a scene in Pixar's Finding Nemo when Dory, a yellow-finned regal tang, injures herself in a tug-of-war over a snorkel mask. A tiny plume of blood curls away from Dory's face into the water around her, where it is sucked into the nostrils of Bruce, a “vegetarian” shark who immediately recants his no-sushi policy. (Fortunately, Dory escapes.) Scientists have known for some time that many ocean predators relish the scent of an injured fish, whereas fish that are more likely to end up as a meal flee from the same scent
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Scary Stuff: Fright Chemical Identified in Injured Fish