Sinuous fish are a type of fish that have a long, slender body and move in a winding or undulating motion. They are commonly referred to as eels (3 letters) or eels (4 letters). These fish are found in both fresh and salt water habitats and can range in size from a few inches to several feet in length. They are carnivorous and feed on small fish, crustaceans, and other aquatic creatures. Sinuous fish are an important part of many ecosystems and are often used as food sources for humans.