Slithery fish are a type of fish that have long, slender bodies and are characterized by their ability to move in a sinuous or serpentine fashion. Two examples of slithery fish are eels, which have four letters, and EEL, which has three letters. Eels are found in both saltwater and freshwater habitats and can range in size from a few inches to several feet in length. They are carnivorous and feed on other fish, crustaceans, and mollusks.