Black Ghost Knifefish
The black ghost knifefish is a black, tropical South American freshwater fish that grows to 18-20 inches and is characterized by its blade-like appearance due to a lack of dorsal and caudal fins, replaced by a long, wavelike anal fin for maneuverability.
It has a white blaze on its nose and two white rings on its tail, and uses an electric organ to navigate and find food.
These nocturnal and timid fish require a large, dimly lit aquarium with plenty of hiding places, and can become tame enough to eat from their owner’s hands.
| Specification | Detail |
|---|---|
| Species | Black Ghost Knifefish |
| Origin | Tropical South America |
| Size | 18-20 inches |
| Fin Structure | Lack of dorsal and caudal fins; long wavelike anal fin |
| Distinctive Features | White blaze on nose, two white rings on tail |
| Behavior | Nocturnal, timid, may become tame and accept food from hand |
FAQ
What is the typical size of a black ghost knifefish?
The black ghost knifefish grows to 18-20 inches in length.
How does the black ghost knifefish navigate in the dark?
It uses an electric organ to sense its environment and locate food.
What kind of aquarium setup is needed for this fish?
A large, dimly lit aquarium with plenty of hiding places is required.

Oliver Ogden –
My black ghost knifefish has been in the tank for six months. It’s very quiet and stays in the back corners at night. I noticed it’s curious and will occasionally come near my hand when I feed it. The tank needs to be large and dimly lit, which I’ve managed with a few caves and a low light setup. It’s a unique and calm addition to the aquarium.
Emma Grant –
This fish is striking in appearance with its long, blade-like body. It’s not aggressive and prefers to stay hidden. I keep it in a 75-gallon tank with dim lighting and plenty of plants. After a few weeks, it started to approach the feeding area. I’m happy with the peaceful nature of this species.
Jessica Robertson –
The black ghost knifefish is fascinating to watch. It moves slowly and uses its electric sense to explore. I’ve provided a large tank with hiding spots and soft lighting. It has become quite tame and now eats directly from my hand. A great choice for a quiet, unique aquarium fish.