Trichiurus lepturus

from The Collaborative International Dictionary of English v.0.48

Hairtail \Hair"tail`\ (-t[=a]l`), n. (Zool.)
   Any species of marine fishes of the genus {Trichiurus}; esp.,
   {Trichiurus lepturus} of Europe and America. They are long
   and like a band, with a slender, pointed tail. Called also
   {bladefish}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

cutlass fish \cutlass fish\, cutlassfish \cutlassfish\n.
   1. (Zool.) a peculiar, long, thin, marine fish ({Trichiurus
      lepturus}) of the southern United States and West Indies,
      having a long whiplike scaleless body and sharp daggerlike
      teeth; -- called also {frostfish}, {saber fish}, {silver
      eel}, and, improperly, {swordfish}; also, several related
      members of the genus {Trichiurus}. It is closely related
      to snake mackerel.

   Syn: frost fish, frostfish, hairtail.
        [1913 Webster + WordNet 1.5]

from The Collaborative International Dictionary of English v.0.48

Bladefish \Blade"fish`\, n. (Zool.)
   A long, thin, marine fish of Europe ({Trichiurus lepturus});
   the ribbon fish.
   [1913 Webster]