Buzz
Electric eels possess unique organs capable of generating electricity, which they use not only to immobilize their prey but also to detect it in low-light conditions. A recent study published in Nature Communications [PDF] reveals how these nocturnal hunters leverage electric fields to both locate and incapacitate their targets with shocks reaching up to 600 volts.
Ken Catania, a neurobiologist at Vanderbilt University, performed a series of controlled experiments to observe this electrifying behavior. He placed anesthetized fish, shielded from the eels' electroreceptors by plastic bags, into the tank. When Catania stimulated the fish to twitch using an electrode, the eel unleashed its electric attack. However, the eel was left puzzled afterward, lunging towards the movement in the water but failing to consume the fish.
The experiment took a fascinating turn when Catania introduced a conductive carbon rod into the tank. After discharging its electric shock, the eel initially moved towards the fish but then redirected its attention to the rod, regardless of its position. When Catania placed the rod on a rotating wheel and removed the fish entirely, the eel became even more disoriented, attempting to consume the rod it mistook for prey.
This behavior indicates that electric eels can simultaneously employ their electric discharges as both a hunting tool and a tracking mechanism. In a previous study published in Science, Catania demonstrated how an electric eel’s shock triggers involuntary muscle spasms in its prey by stimulating motor neurons. After a few electric bursts, the prey’s location is revealed, allowing the eel to strike with precision. The eel captures its prey within milliseconds, utilizing its high-voltage discharge to accurately determine the target’s position.
These discoveries elevate electric eels to the ranks of bats, sharks, and other animals that rely on a unique “sixth sense” to hunt. Sharks and rays detect electric fields produced by other organisms, while bats and certain whales use echolocation to interpret reflected sound waves. However, electric eels stand out as the only creatures whose sensory mechanism also serves as a weapon, making them even more remarkable (or fearsome) than previously understood.
