The term 'long, skinny fish' can be summarized as an EEL, which is a three-letter word. Eels are elongated fish that can range in size from the tiny conger EEL to the giant moray EEL. They are found in both saltwater and freshwater habitats, and some species are even capable of living in brackish water. Eels are carnivorous and feed on a variety of prey, including small fish, crustaceans, and mollusks.