Apteronotus albifrons (Black Ghost Knifefish) — 4–6 inches

Overview

The Black Ghost Knifefish is a captivating freshwater species native to the Amazon and Orinoco River basins in South America. Recognized for its elongated, knife-like body and bioluminescent tail spot, it is a nocturnal predator that utilizes weak electrical fields to navigate and hunt in dark waters. This species is best suited for experienced aquarists due to its specialized care requirements and potential for long-term companionship.

Key Features

• Size: 4–6 inches (juvenile to sub-adult)

• Origin: Amazon and Orinoco River basins, South America

• Temperament: Peaceful with other species; territorial with conspecifics

• Lifespan: Up to 15 years with proper care

• Diet: Carnivorous; feeds on small fish, invertebrates, and high-quality pellets

Tank Requirements

• Minimum Tank Size: 75 gallons for a single individual; larger tanks recommended for groups

• Water Parameters:

  • Temperature: 24–28°C (75–82°F)

  • pH: 6.0–7.5

  • Hardness: Soft to moderately hard

• Filtration: Strong filtration is essential; maintain pristine water quality

• Tank Setup: Provide ample hiding spots using driftwood, rocks, and plants; sandy or fine gravel substrate preferred

Social Behavior & Compatibility

• Group Dynamics: Prefers to be kept singly or in small groups; avoid overcrowding

• Tankmates: Compatible with other peaceful, non-aggressive species; avoid housing with other knifefish or similarly shaped species

• Breeding: Difficult to breed in captivity; mouthbrooder with internal fertilization