Black Ghost Knife Fish

Knife Fish | Black Ghost Knife Fish

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(Please note that the fish shown in the photo is only a representative of what an adult specimen would look like. The color may vary based on the age and sex of the fish you receive.)

Scientific Name: Apteronotus albifrons

Common Name: Black Ghost Knife Fish

Adult Size: 18 - 20 inches

Life Expectancy: 10 years

Habitat: South America

Minimum Tank Size: 100 gallons

Ideal Tank Conditions:

  • Temperature Range: 75 - 82°F
  • pH Range: 6.8 - 7.8
  • Water Hardness: 5 - 15

Temperament: Typically peaceful but can be aggressive toward other Black Ghost Knife Fish. However, as long as these fish have enough space to call their own, it’s unlikely that they’ll be aggressive toward one another.

Diet & Nutrition: Their ideal diet is very similar to what they eat in their natural habitat. They are carnivores and will eat all types of live foods, meat, chopped earthworms, as well as frozen and flaked foods.  Unlike some other species, these fish tend to be very resistant to transitioning over to flake or pellet foods. Their preference is a more protein-rich and natural diet. Any of the go-to live or frozen foods will work (a variety is always recommended).Bloodworms, prawns, brine shrimp, and tubifex can be used regularly.

Breeding & Spawning: Not highly recommended due to the lack of information that’s available on the process.

Gender: Extremely difficult to to determine. Little is known, however it has been speculated that the male's eyes are more towards the top of the head, while female's eyes may be closer to the front of the head.