Any fish of the order Anguilliformes. Eels are snakelike, with elongated dorsal and anal fins. They include the freshwater eels of Europe and North America (which breed in the Atlantic), the marine conger eels, and the morays of tropical coral reefs.
The gulper eel,
Eurypharynx pelecanoides, is found in all the world's oceans to depths of 3,000 m/9,800 ft. It has a huge mouth and a long whiplike tail, and can reach up to 2 m/6.6 ft in length.
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