Knifefish

The word knife fish refers to three different groups of fish that are not closely related to each other.

• The family of the Old World Knifefish (Notopteridae) from the order of the osteoglossiformes (Osteoglossiformes).
• The order of the New World knife fish (Gymnotiformes), the sister group of the catfish-like (Siluriformes).
• The family of the snipe knife fish (Centriscidae) from the order of the pipefish (Syngnathiformes).

This is a disambiguation page for differentiating between several terms identified with the same word.