Abstract: Procedure for electro-stunning and/or electro-sacrifice, for industrial application to marine ichthyological species in floating cages having a floating cage (12) with tuna fish (6) two divers are introduced, the hunter (1), who uses a rifle with a harpoon with a Teflon head and metallic tip (4), joined to equipment for transforming electric potential (3) on the boat (7) and also connected to a plate (5) submerged and the controller (2) that activates the equipment (3), which sends an electric stunning signal or a signal that kills the fish (6) to the two terminals of the plate (5) and tip (4), the fish is lifted from the water by the crane (10), and equipped with a collar or identifying plastic label (11), the rifle and the harpoon are recovered towards the boat (7).