Knifefish
# 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.
