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Knifefish may refer to several knife-shaped fishes:
- The Neotropical or weakly electric knifefishes, order Gymnotiformes, containing five families:
- The featherbacks, family Notopteridae.
- The aba, Gymnarchus niloticus
- Four other unrelated fish species not in any of the above families:
- Knifefish (robot), an American military robot
|This disambiguation page lists articles associated with the title Knifefish.
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