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