The American eel, Anguilla rostrata, is a facultative catadromous fish found on the eastern coast of North America. Eels (Anguilla spp.) are fishes belonging to the elopomorph superorder, a group of phylogenetically ancient teleosts. The American eel has a slender snakelike body that is covered with a mucous layer, which makes the eel appear to be naked and slimy despite the presence of minute scales. A long and dorsal fin runs from the middle of the...