Many fish detect sound using a system called the lateral line, a network of tiny sensors running along their body. These sensors pick up pressure changes, vibrations, and water movement, allowing fish to sense predators, prey, and even distant disturbances without hearing in the human sense. Sound travels four times faster in water than in air, so vibrations reach fish long before anything is visible. Some species also use internal structures, like swim bladders, to amplify these vibrations. Ins

A shark's lateral line detects water movement, which assists when tracking prey. The lateral line is a complex canal with a series of pores that runs horizontally down its body and extends around its face and mouth. | National Aquarium

Fish have a unique sensory system called the lateral line, and it’s their ultimate superpower. Learn how the lateral line works, why it’s important for fish survival, and what you might be doing that’s unintentionally scaring fish away. | Salt Strong