noun, plural quillbacks (especially collectively) quillback.
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.

1880–85, Americanism; quill + back1

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Quillback carpsucker was the only species that was sampled in riffles but not in pool or run habitats.
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