Eel
Regardless of their final habitat, all eels probably pass through the leptocephalus stage, an extended larval phase,
in the open ocean and undergo metamorphosis to a juvenile stage that is
a smaller version of the adult. At maturity eels range in length from
10 cm (4 inches), in the deep-sea Cyema atrum, to 3.5 metres (11.5 feet), in the moray Thyrsoidea macruara .
Eels occur to considerable depths in most oceans and are greatly
diverse in tropical seas. They range in colour from drab gray or black
in deep-sea species to colourful and patterned in tropical reef species.
Only the freshwater eels (family Anguillidae), which are in places
abundant and greatly valued as food, are of major economic importance.
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