Bottom-dwelling fish are fish that live near the bottom of the ocean or other body of water. Examples of these fish include the RAY and COD. Rays are a type of cartilaginous fish, meaning they have skeletons made of cartilage instead of bone. They are typically found in shallow waters and can range in size from a few inches to several feet. COD are a type of bony fish, meaning they have skeletons made of bone. They are usually found in deeper waters and can grow up to six feet in length. Both the RAY and COD are important sources of food for humans.