quillback

[ kwil-bak ]
/ ˈkwɪlˌbæk /

noun, plural quill·backs, (especially collectively) quill·back.

a carpsucker, Carpiodes cyprinus, inhabiting waters in the central and eastern U.S., having one ray of the dorsal fin greatly elongated.
Also called quillback carpsucker.

Origin of quillback

An Americanism dating back to 1880–85; quill + back1