Wiktionary
black scabbardfish
n. A North Atlantic fish of the cutlassfish family Trichiuridae with an extremely elongated, eel-like body, (taxlink Aphanopus carbo species noshow=1).
Wikipedia
Black scabbardfish
The black scabbardfish, Aphanopus carbo, is a bathypelagic cutlassfish of the family Trichiuridae found in the Atlantic Ocean between latitudes 69° N and 27° N at depths of between . Its length is up to , but it reaches maturity at around .