Finless fish are a type of fish that lack the presence of a dorsal fin. They are found in both freshwater and saltwater environments, and are typically characterized by their elongated bodies and slimy skin. The two crossword solutions for the term FINLESS FISH are EEL (3 letters) and EELS (4 letters). EEL is a common name for a variety of ray-finned fish, and eels are a group of fish that includes many species of fish, including the finless fish.