Black Arowana (Osteoglossum Ferreirai)

Black Arowana (Osteoglossum ferreirai)

The Black Arowana is one of the most unique and elegant arowana species available, prized for its dramatic transformation from a jet-black juvenile into a sleek, metallic adult. Native to the Rio Negro and surrounding Amazonian blackwater systems, this species is known for its elongated body, smooth swimming motion, and surface-hunting behavior. Compared to other arowanas, the Black Arowana offers a more refined and understated look, making it a standout centerpiece for large aquariums.

Diet

Black Arowanas are carnivorous surface feeders:

• Floating pellets (can be trained; staple diet)
• Insects (crickets, mealworms)
• Shrimp, prawns, and fish
• Frozen foods (krill, silversides)

A varied, high-protein diet supports growth and coloration.

Tank Requirements

• Minimum Tank Size: 180–250 gallons
• Water Type: Freshwater (prefers soft, acidic conditions)
• Temperature: 75–82°F
• pH: 5.0–7.0
• Setup: Long tank with open swimming space; dim lighting; tight-fitting lid required (excellent jumpers)

Blackwater-style setups enhance comfort and coloration.

Size

• Current Sale Size: Typically 4–8 inches

Max Size

• Maximum Adult Size: 30–36 inches

Tank Mates

Generally more manageable than Jardini Arowanas but still predatory:

• Compatible: Large, peaceful to semi-aggressive fish such as datnoids, stingrays, larger catfish, and silver dollars
• Use caution: With aggressive or fin-nipping species
• Avoid: Small fish (will be eaten) and overly aggressive tank mates

Best kept with similarly sized, non-aggressive species.

Temperament

Semi-aggressive. Typically calmer than Jardini Arowanas, but still territorial and predatory. Very interactive and responsive to their environment.

⚠️ Important Note

Juveniles display a deep black coloration that gradually fades into a lighter, metallic tone as they mature—this natural transformation is part of the species’ appeal.