While divers move through water guided by sight and sound, many marine animals experience an entirely different world—one shaped by faint electrical currents. Every living creature produces tiny electrical fields, created by the movement of muscles and nerves. To most of us, these signals are invisible. But to some animals, they are as clear as light.
Electric eel
Sharks and rays possess a remarkable ability: They can detect the faintest electrical impulses in the water. Hidden in their snouts are tiny sensory organs, called Ampullae of Lorenzini, filled with conductive gel. With them, a shark can sense the heartbeat of a fish buried beneath the sand, or detect the weak signals of prey hidden in darkness.
Even in murky water, even at night, even when prey is perfectly still. The electric field gives it away. It is a form of perception almost unimaginable to us, a way of seeing life itself.
Fish that generate electricity
Some fish do more than detect electricity. They create it. The most famous is the electric eel, capable of producing powerful shocks to stun prey or defend itself. But it is not alone. Electric rays and certain catfish also generate strong electric discharges.
These animals use specialised cells called electrocytes, arranged like biological batteries. When triggered, they release a sudden burst of energy, a living surge flowing through water. Yet not all electric fish are so dramatic.
The quiet electric conversations
In rivers and coastal waters, many fish produce weak electrical fields, not for attack, but for communication and navigation. Knifefish, elephantnose fish, and other species generate a constant, gentle electric signal around their bodies. By sensing distortions in this field, they can “feel” their surroundings, detecting objects, obstacles, and even other fish.
More intriguingly, they modulate these fields to send signals to one another. Subtle changes in rhythm and frequency may carry information about identity, territory, or courtship, a silent conversation carried through water.
A world within the world
What makes this phenomenon so mysterious is how little we perceive of it. An entire layer of the ocean exists, not of light, not of sound, but of electricity. Creatures navigate, hunt, hide, and communicate within it, moving through currents we never notice. For a shark, the ocean glows with living signals. For an electric fish, space itself is shaped by invisible fields.
An ancient language
Electroreception is thought to be one of the oldest senses in the animal kingdom. Long before vision sharpened or hearing evolved, early aquatic animals may have relied on electrical cues to survive. Today, this ancient ability still thrives, from deep-sea hunters to river-dwelling fish, from massive rays to delicate, hidden species. It is a reminder that life does not depend on a single way of knowing the world.
The unseen ocean
To dive is to enter a world of colour, motion, and light. But beneath that familiar beauty lies another ocean entirely, one of currents too subtle to feel, signals too faint to detect, and senses beyond our own. A hidden language flows through every movement, every heartbeat, every flicker of life. We pass through it, unaware. But it is always there.
Ethologist Ila France Porcher, author of Yes, Fish Feel Pain, The True Nature of Sharks, and six other books on wildlife behaviour, conducted a seven-year study of reef sharks in Tahiti, resulting in several scientific papers. Her decades of first-hand observations of wildlife—from sharks to bears to birds—focus on the individuality and intelligence of wild individuals, challenging traditional views of animal minds. Her work has been featured on Shark Week, in scientific discussions, conservation debates, and international media for its unique blend of field observation, art, and science.
