| image = Anguilla japonica 1856.jpg | image_caption = ''Anguilla japonica'' | image_upright = 1.1 | taxon = Anguilliformes | authority = L. S. Berg, 1943 | subdivision_ranks = Suborders | subdivision = :Protanguilloidei :Synaphobranchoidei :Muraenoidei :Chlopsoidei :Congroidei :Moringuoidei :Saccopharyngoidei :Anguilloidei | type_genus = ''Anguilla'' | type_genus_authority = Garsault, 1764 }}
An eel is a ray-finned fish belonging to the order Anguilliformes (), which consists of eight suborders, 19 families, 111 genera, and about 800 species. Eels undergo considerable development from the early larval stage to the eventual adult stage, and most are predators.
The term "eel" is also used for some other eel-shaped fish, such as electric eels (genus ''Electrophorus''), spiny eels (family Mastacembelidae), and deep-sea spiny eels (family Notacanthidae). These other clades, however, evolved their eel-like shapes independently from the true eels. Eels live both in salt water and fresh water. Provided by wikipedia
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