Documentary presenting a group of animal species relatively unknown, the electric fish. Ten marine vertebrates that use electricity for different purposes, including Nile catfish, elephant fish and electric eel, are studied, as well as cetaceans and mammals, such as the Guinean dolphin. platypus. The preliminary pages provide elements to understand the legends used throughout the book, such as the difference between passive and active electric fish, according to the use they make of this unusual ability, the intensity of their current and their geographical location. The conclusion is based on an overview of the study of these fish in the course of history.--Translated by Google.