noun, plural jackknife-fishes (especially collectively) jackknife-fish. Ichthyology.
a black and white, American drum, Equetus lanceolatus, found in tropical areas of the Atlantic Ocean, having an elongated dorsal fin that is held erect.
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black-and-white drumfish with an erect elongated dorsal fin 
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Jackknife-fish's coloration makes it stand out to potential mates.
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