threadfish

from The Century Dictionary.

• noun A common name of Alectis ciliaris, a carangoid fish ranging northward from the tropics on both American coasts to Mazatlan and Cape Cod.
• noun The cordonnier or cobbler-fish, Blepharis crinitus.
• noun The cutlas-fish. See cut under Trichiurus.

from the GNU version of the Collaborative International Dictionary of English.

• noun The cutlass fish.
• noun A carangoid fish (Caranx gallus, or Caranx crinitus) having the anterior rays of the soft dorsal and anal fins prolonged in the form of long threads.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The cutlassfish.
• noun A carangoid fish (Caranx gallus or Caranx crinitus) having the anterior rays of the soft dorsal and anal fins prolonged in the form of long threads.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun fish having greatly elongated front rays on dorsal and anal fins
• noun fish having greatly elongated front rays on dorsal and anal fins