Barracudas are generally not a threat to humans, but they can attack when they feel threatened or when food is scarce. Barracudas have sharp teeth and powerful jaws, but attacks on humans are relatively rare. Most instances of barracuda attacks occur when a human swims near a school of feeding barracudas or when a barracuda mistakes a shiny object, such as a piece of jewelry or a fishing lure, for prey. It's important for swimmers to be aware of their surroundings when entering waters where barracudas are present, and to avoid provoking them. In general, barracudas are shy and will avoid confrontation with humans when possible.