Choosing a Knifefish Freshwater Species By: Dr. Amy Wolff -->   
  Royal knifefish are not as readily found in pet stores as the ghost knifefish. Section: Fish Profile

The knifefish is an unusual and beautiful fish that is sure to attract attention in your freshwater aquarium. Varieties of knifefish can be found from South America to Africa to Southeast Asia. They are a peaceful and shy fish that will need a long tank to show off their graceful swimming skills.

Appearance and Behavior

Knifefish are named because of their flattened and tapered appearance. It looks as if you could hold one by the tail and use it like a knife. The long fin on its underside waves continually, adding to its beauty. These fish are shy and hide during the day. They swim and feed at night, giving your tank 24-hour activity.

It’s best to provide your knifefish with a hiding place for the daylight hours. A hollow log or plexiglass tube will do nicely or construct a deep cave. Knifefish have a weak electric organ at the base of the tail used for locating their food. Knifefish are reported to be peaceful most of the time, but are known to be aggressive eaters and can consume smaller tank mates.

There are over 20 varieties of knifefish but only 4 are popul ...

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