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True eels (Anguilliformes) are an order of fish, which
consists of 4 suborders, 19 families, 110 genera and
approximately 600 species. Most eels are predators.
The flat and transparent larva of the eel is called a
leptocephalus. A young eel is called an elver.
Most eels prefer to dwell in shallow waters or hide at
the bottom layer of the ocean, sometimes in holes.
These holes are called eel pits. Only the Anguillidae
family comes to fresh water to dwell there (not to
breed). Some eels dwell in deep water (in case of family
Synaphobranchidae, this comes to a depth of 4,000 metres
(13,000 ft), or are active swimmers (the family
Nemichthyidae - to the depth of 500 metres (1,600 ft)).
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