Definition of jackknife fish in English:

jackknife fish

Syllabification: jack·knife fish

noun

  • A strikingly marked fish with a long, upright dorsal fin that lives among rocks and corals in the warm waters of the western Atlantic.
    • Equetus lanceolatus, family Sciaenidae
    More example sentences
    • The jackknife fish is a particularly handsome species, which immediately catches the eye with its long tapering first dorsal fin.
    • The Jackknife fish will comb the sandy bottom looking for worms, crustaceans, and small fish if it is hungry. It may even eat the occasional fireworm.

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