ribbon-fish

from The Century Dictionary.

• noun One of sundry fishes of long, slender, compressed form, like a ribbon, as those of the genera Cepola, Trichiurus, Trachypterus, and Regalecus: especially applied to those of the suborder Tæniosomi. See the technical names, and cut under hairtail.
• noun A fish of the genus Eques, especially E. lanceolatus.