Gymnotus, or ELECTRIC EEL (G. electricus), the most powerful of the electric fishes, occurs in the fresh water of Brazil and Guiana. It is type of a family Gymnotidae among the Physostomous bony fishes, but is the only known species of its genus. There are no dorsal nor strictly caudal fins, but the anal fin extends on to the end of the tail; there are no scales, and the eyes are very small. The fish attains a length of 6 feet, and is capable with its shock of temporarily paralysing a man or large animal, or of killing its prey of fishes and amphibians. For description of the electric organs, see ELECTRIC FISHES.