Definitions for quillbackˈkwɪlˌbæk
Random House Webster's College Dictionary
a sucker, Carpiodes cyprinus, of the central and eastern U.S., having one ray of the dorsal fin greatly elongated.
Origin of quillback:
Carpiodes cyprinus, a freshwater fish of the sucker family with a long filament that extends back from the dorsal fin.
an American fresh-water fish (Ictiobus, / Carpiodes, cyprinus); -- called also carp sucker, sailfish, spearfish, and skimback