title: Knifefish
text: # Knifefish
  
  Knifefish may refer to several knife-shaped fishes:
  
  * The Neotropical or weakly electric knifefishes, order Gymnotiformes, containing five families:
     * Family Gymnotidae (banded knifefishes and the electric eel)
     * Family Rhamphichthyidae (sand knifefishes)
     * Family Hypopomidae (bluntnose knifefishes)
     * Family Sternopygidae (glass and rat-tail knifefishes)
     * Family Apteronotidae (ghost knifefishes)
  * The featherbacks, family Notopteridae.
  * The aba, Gymnarchus niloticus
  * Four other unrelated fish species not in any of the above families:
     * Grey knifefish, Bathystethus cultratus.
     * Blue knifefish, Labracoglossa nitida.
     * Collared knifefish or finscale razorfish, Cymolutes torquatus.
     * Jack-knifefish, Equetus lanceolatus.
  