Electric eel part 2

The electric eel's electrical capabilities were studied by Hugh Williamson and John Hunter in 1775, contributing to the 1800 invention of the electric battery. Three pairs of electric organs are arranged along the body, enabling the fish to generate both low voltage discharges for electrolocation, and high voltage discharges to stun prey or to defend themselves. Electroreceptors are distributed around the body in the skin; this enables them to detect the electric signals of other Gymnotiform fish, which they hunt. Electric eels grow as long as they live, adding more vertebrae to their spinal column; males are larger than females. In aquaria, they can live for at least 20 years.