Black Arowana (8-9”)

Scientific Name:

Osteoglossum ferreirai

Maximum Size and Lifespan:

• Maximum Size: ~40 inches (100 cm) in the wild; usually 30–36 inches (75–90 cm) in captivity

• Lifespan: 15–20 years (with proper care)

Recommended Aquarium Size:

• Minimum Tank Size: 250–300+ gallons for Adults. Juveniles can be raised in a 75-125g for closer monitoring.

• Tank Dimensions: At least 6 ft long and 3 ft wide

• Tank Setup:

  • Secure, tightly fitting lid (they are powerful jumpers)

  • Strong filtration and high water flow

  • Large open swimming space with minimal obstructions

  • Soft sandy substrate and some driftwood or floating plants for natural feel

Water Changes and Care:

• Water Changes: 25–50% weekly depending on size

• Water Parameters:

  • Temperature: 75–82°F (24–28°C)

  • pH: 6.0–7.5

• Care Level: Intermediate to advanced (due to size, aggression potential, and water quality needs)

• Tankmates: Other large, robust fish like large catfish, stingrays, bichirs, Larger cichlids, Silver Dollars, Tinfoil Barbs, etc.

Diet:

• Juveniles:

  • Hikari Foodsticks, Chopped Shrimp, Bloodworms.

• Adults:

  • Hikari Carnisticks, Shrimp, and Tilapia

• Feeding Frequency:

  • Juveniles: 1–2 times daily

  • Adults: Every other day or 5 times per week

• Diet Overview Before Breeding:

  • High-quality, varied diet with added live foods to promote breeding condition

Natural Habitat:

• Region: Blackwater rivers and tributaries of the Rio Negro basin in Brazil and Colombia

• Habitat Type:

  • Slow-moving, acidic waters with tannins from decomposing leaves

  • Dense vegetation, submerged roots, and dim lighting

  • Surface-dwelling; often found near fallen branches and overhangs

Breeding:

• Difficulty: Very difficult in captivity; rarely achieved outside of specialized farms

• Method:

  • Mouthbrooders: Males incubate fertilized eggs in their mouths

  • Pairs must be well established and conditioned

• Spawning Behavior:

  • Typically occurs during the rainy season in the wild

  • Male holds 30–50 eggs for 6–8 weeks

  • Fry are released fully formed and cared for briefly before becoming independent

• Aquarium Breeding: Requires enormous tank or pond, excellent water quality, dim lighting, and minimal disturbance

Overview:

The Black Arowana is a majestic and powerful predatory fish known for its striking dark coloration and surface-skimming behavior. This Arowana and the Jardini are the only ones that don't usually get drop eye. It is best suited for experienced aquarists with large aquariums and a deep understanding of water chemistry and predator care. While similar to its more common cousin, the Silver Arowana, the Black Arowana tends to be a bit more sensitive, especially in early life stages. With proper conditions, it can become the showpiece of any large freshwater setup.