Electric Eels Can Deliver 860-Volt Shocks

The remarkable electrical generating capability of the electric eel stems from a highly specialized anatomy. About 80% of the fish's body is occupied by three electric organs, which are composed of thousands of modified muscle cells known as electrocytes. These cells are stacked in long columns, functioning much like batteries connected in series. When the eel's brain sends a nerve signal, it triggers the simultaneous discharge of these electrocytes. While each cell produces only a small voltage, the cumulative effect of thousands acting in unison generates a formidable electrical pulse.

This incredible natural phenomenon was not just a curiosity for early explorers; it played a crucial role in the history of science. The study of the electric eel's anatomy and electrical capabilities in the 18th century directly inspired Italian scientist Alessandro Volta. His research into how the eel produced electricity led him to develop the first electric battery in 1800, which he described as an artificial replication of the eel's electric organ. This connection highlights a direct link between the study of the natural world and a pivotal technological invention.

Interestingly, despite their common name, electric eels are not true eels but are a type of knifefish more closely related to catfish. For over two centuries, scientists believed there was only one species, but in 2019, research revealed two additional species, including *Electrophorus voltai*, the species capable of producing the strongest discharge. Beyond their powerful defensive and predatory shocks, these fish also emit weaker electrical signals to navigate and communicate in the murky waters of their South American habitats, demonstrating a sophisticated and dual use of their unique biological adaptation.