Black Ghost Knifefish (Apteronotus albifrons)

⚫ Black Ghost Knifefish (Apteronotus albifrons) Care Guide

The Black Ghost Knifefish is a mysterious, elegant, and nocturnal freshwater fish known for its long, ribbon-like body, undulating fin, and unique ability to generate weak electrical fields for navigation and communication. Its jet-black color and ghostly appearance make it a striking centerpiece for large aquariums.

Tank Requirements

• Minimum Tank Size: 250 litres (large, adult specimens need at least 300–400 litres)

• Temperature: 24–28°C

• pH: 6.5–7.5

• GH: 3–12

• KH: 3–8

• TDS: 100–200 ppm

They require stable, clean water and ample swimming space. Strong filtration and oxygenation are recommended due to their size and activity.

Habitat Setup

Recreate a natural environment with:

• Dark substrate to enhance their black coloration

• Driftwood, caves, and rocks for hiding

• Dense plants along edges or corners

• Dim lighting or shaded areas, as they are nocturnal and prefer low-light conditions

They often patrol the tank slowly, so open swimming areas are essential.

️ Feeding

Black Ghost Knifefish are carnivorous and nocturnal feeders. Offer a varied diet:

• Live or frozen foods: bloodworms, blackworms, brine shrimp

• Sinking pellets formulated for carnivorous fish

• Occasional chopped shrimp

Feed in the evening or at night, when they are most active.

Tank Mates

They are generally peaceful but can become territorial with other large, similarly-shaped knifefish.

Ideal companions:
Larger tetras, peaceful barbs, Corydoras, peaceful cichlids, and shrimp.

Avoid very small fish (they may be seen as prey) or aggressive species.

⚠️ Behavioral Note: They are nocturnal, shy, and prefer dim lighting. Providing hiding spots reduces stress and encourages natural behaviors.

Breeding

Breeding in home aquariums is extremely rare. They are primarily bred in specialized facilities with controlled conditions.

Interesting Fact

Black Ghost Knifefish generate a weak electric field using a specialized organ along their body. This allows them to navigate, detect prey, and communicate with other knifefish even in complete darkness — earning them their “ghostly” reputation! ⚡

Reference: Bubbly Fish – Creating underwater wonders