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Eel
An eel is any fish belonging to the order Anguilliformes (), which consists of four suborders, 20 families, 111 genera and about 800 species. Most eels are predators. The term "eel" (originally referring to the European eel) is also used for some other similarly shaped fish, such as electric eels and spiny eels, but these are not members of the Anguilliformes order.
==Description==
Eels are elongated fish, ranging in length from in the one-jawed eel (''Monognathus ahlstromi'') to in the slender giant moray. Adults range in weight from to well over . They possess no pelvic fins, and many species also lack pectoral fins. The dorsal and anal fins are fused with the caudal fin, forming a single ribbon running along much of the length of the animal. Eels swim by generating body waves which travel the length of their bodies. They can swim backwards by reversing the direction of the wave.〔Long Jr, J. H., Shepherd, W., & Root, R. G. (1997). (Manueuverability and reversible propulsion: How eel-like fish swim forward and backward using travelling body waves". ) In: ''Proc. Special Session on Bio-Engineering Research Related to Autonomous Underwater Vehicles'', 10th Int. Symp. (pp. 118–134).〕
Most eels live in the shallow waters of the ocean and burrow into sand, mud, or amongst rocks. A majority of eel species are nocturnal, thus are rarely seen. Sometimes, they are seen living together in holes, or "eel pits". Some species of eels also live in deeper water on the continental shelves and over the slopes deep as . Only members of the ''Anguilla'' regularly inhabit fresh water, but they, too, return to the sea to breed.
The heaviest true eel is the European conger. The maximum size of this species has been reported as reaching a length of 3 m (10 ft) and a weight of 110 kg (240 lb).〔(Conger conger, European conger: fisheries, gamefish, aquarium ). Fishbase.org〕 Other eels are longer, but do not weigh as much, such as the slender giant moray which reaches 4 m (13 ft).〔(FishBase ). FishBase (2011-11-15).〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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