Black Ghost Knifefish - 10cm

Species Profile

• Scientific Name: Apteronotus albifrons
• Common Name: Black Ghost Knifefish
• Adult Size: 18–20 inches (45–50 cm) in captivity; slightly larger in the wild
• Life Expectancy: 10–15 years with optimal care
• Habitat: Native to freshwater river basins in South America (especially the Amazon). Inhabits slow-moving or still waters with dense vegetation and submerged structures for shelter

Tank Requirements

• Minimum Tank Size: 100+ gallons (379+ liters) for an adult
• Ideal Temperature: 75–82°F (24–28°C)
• pH Range: 6.5–7.5
• Water Hardness: Soft to moderately hard (2–12 dGH)
• Temperament: Peaceful but territorial with its own species; can coexist with calm, non-aggressive tankmates of similar size. Nocturnal and shy—requires hiding spaces

Diet & Nutrition

• Omnivorous: Yes (primarily carnivorous)
• Diet: Prefers protein-rich foods like bloodworms, brine shrimp, and blackworms. Can be trained to accept frozen foods and high-protein pellets

Appearance

• Coloration: Deep black body with a distinctive white blaze on the nose and two white bands on the tail
• Body Shape: Elongated, knife-like body with no dorsal fin and a long undulating anal fin used for graceful movement
• Eyes: Small; relies more on electrical signals than vision

Distinctive Features

• Electroreception: Uses a weak electric field for navigation and communication in murky waters
• Backwards swimming ability and highly agile in tight spaces
• Nocturnal behavior—active mostly at night or in dim lighting
• Graceful swimming motion with its long anal fin, resembling a ribbon floating through the water