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From Wikipedia, the free encyclopedia

Knifefish refers to several knife-shaped fishes:

• The order Gymnotiformes of knifefishes.
• The family Notopteridae of featherbacks.
• The family Sternopygidae of glass knifefishes.
• Four other fishes not in any of the above:
  • Grey knifefish, Bathystethus cultratus.
  • Blue knifefish, Labracoglossa nitida.
  • Collared knifefish or Finscale razorfish, Cymolutes torquatus.
  • Jack-knifefish, Equetus lanceolatus.

resources: All Things Knife