Nature has some quirky creatures, but perhaps the most bizarre are electric fish. There are several species that share the capability of producing electrical discharges. Electric fish use discharges to stun their food, to defend themselves, and to navigate in the alluvium of tropical rain forest rivers. The most prominent of these “shocking” creatures is the electric eel.
The cells work in a series, multiplying power, to deliver a charge. The electric eel’s eyes are small, and, interestingly, over time are affected by its own electrical discharges. Over a period of time, the eel’s eyes get a hardening of the cornea called a cataract. The cataracts eventually cause the electric eel to become blind.
• the electric catfish (Malapterus electricus) of the Congo and Nile River basins -has a shock organ that extends along its entire dorsal side.