All lack scales, and many lack caudal fins, possessing instead a sharp-pointed tail for burrowing into sand, mud, or shell hash. Eel. In this position they sway like blades of grass in the wind, while feeding on small planktonic animals floating by in the water.When the eels reach about 10 years of age and are black with silvery white underparts, and sufficiently fattened, they cease feeding and begin a seaward journey. In this position they sway like blades of grass in the wind, while feeding on small planktonic animals floating by in the water.When the eels reach about 10 years of age and are black with silvery white underparts, and sufficiently fattened, they cease feeding and begin a seaward journey.
After spawning, the eels die.Fish, an aquatic vertebrate (backboned) animal that typically breathes by means of gills and moves by means of fins. They are cold-blooded animals; that is, their body temperature is usually about the same as the temperature of their environment.Fish are the most numerous of all vertebrates. They remain buried in the sand at night, but during the day they extend 30 to 60 cm (1 to 2 ft) out of their burrows. Like frogs, freshwater eels have dense networks of blood vessels in their skin and can absorb oxygen directly from air or water.The snake and worm eels are the most highly evolved burrowing forms of eel. They usually live in tropical seas, on sandy slopes from 15 to 60 m (50 to 200 ft) deep that are swept by currents. The eels spawn at depths of 400 to 700 m (1,300 to 2,300 ft), each female laying up to several million free-floating eggs. Fish are found throughout the world in both fresh and salt water and in widely different habitats. Not all mature landlocked eels undergo this migration, but those which do will even cross fields wet with dew to reach seaward rivers. When they reach the sea, both European and American eels head for the Sargasso Sea, a sluggish circle of currents containing much seaweed, situated in the western Atlantic between Bermuda and Puerto Rico. Not all mature landlocked eels undergo this migration, but those which do will even cross fields wet with dew to reach seaward rivers. After spawning, the eels die.Fish, an aquatic vertebrate (backboned) animal that typically breathes by means of gills and moves by means of fins.

The so-called shellfish, of course, are not fish at all; these invertebrate animals are either crustaceans (such as shrimp, lobsters) or mollusks (such as clams, oysters).
For European eels this journey lasts more than a year. The garden eels have large eyes, are extremely slender (about the diameter of a pencil), and are 30 to 50 cm (12 to 20 in) long. All but 3 of the 22 marine families are scaleless. One freshwater family of eels has tiny, barely visible scales. Their dorsal and anal fins are elongate and tend to join with the tail fin to form one continuous “fin” around the body. Eels lack pelvic fins. Their dorsal and anal fins are elongate and tend to join with the tail fin to form one continuous “fin” around the body. As nouns the difference between fish and eel is that fish is (countable) a cold-blooded vertebrate animal that lives in water, moving with the help of fins and breathing with gills or fish can be (obsolete) a counter, used in various games while eel is any freshwater or marine fish of the order anguilliformes, which are elongated and resemble snakes. There are over 30,000 species of fishes, usually divided into three major groups: the primitive jawless fishes, including lampreys and hagfishes; and two groups of jawed fishes—the cartilaginous fishes, including sharks, skates, and rays, and the bony fishes, which are by far the largest group and include most of the familiar fishes such as trout, perch, bass, cod, halibut, and tropical fishes raised in home aquaria. Eel is the common name for about 400 species of mostly marine snakelike fishes generally inhabiting shallow waters throughout the world.


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