Freshwater eels are elongated fish found in rivers, lakes, and streams around the world. They belong to the family Anguillidae and are known for their slippery bodies and unique life cycle. Most species, like the American eel and European eel, migrate between freshwater and saltwater, spawning in the ocean. These eels are carnivorous, feeding on insects, crustaceans, and small fish. They play an important role in their ecosystems as both predators and prey. Freshwater eels are also valued in various cuisines, particularly in Japanese dishes like unagi, where they are grilled and served over rice.