Silver scabbardfish
Encyclopedia
The silver scabbardfish (also frostfish, beltfish), Lepidopus caudatus, is a cutlassfish
Cutlassfish
The cutlassfishes are about 40 species of predatory fish in the family Trichiuridae found in seas throughout the world. Fish of this family are long, slender, and generally steely blue or silver in colour, giving rise to their name...

 of the family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Trichiuridae found throughout the temperate seas of the world. It grows to over 2 metres (6.6 ft) in length.
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