Orinoco F1 Altum Angelfish – Pterophyllum Altum

The Pterophyllum altum – Orinoco F1, known as the Orinoco Altum Angelfish, is a rare and highly sought-after freshwater species originating from the Orinoco River basin in South America. Renowned for its tall, laterally compressed body and striking vertical striping, this F1 generation fish is a prized addition for advanced aquarists and collectors seeking a majestic centerpiece.

Detailed Description & Features:

• Scientific Name: Pterophyllum altum

• Common Name: Orinoco Altum F1 Angelfish

• Origin: South America – Orinoco River Basin

• Size: Can reach up to 20 cm in body length, with fins extending further

• Temperament: Semi-aggressive; highly territorial, especially during breeding

• Tank Size: Minimum 250 liters; taller tanks are preferred to accommodate vertical body shape

• Water Conditions:

  • Temperature: 26–30°C

  • pH: 5.5–6.5 (soft, slightly acidic water preferred)

  • Hardness: Very soft to soft

• Diet: Carnivorous/omnivorous – accepts high-quality flakes, pellets, frozen or live foods; requires protein-rich diet for optimal growth

• Behavior: Peaceful with similarly sized tank mates; shy when first introduced; appreciates densely planted areas and tall vertical structures

• Breeding: F1 generation; breeding in captivity is challenging and requires ideal water parameters and a mature pair

Feeding Recommendations:
Feed a varied protein-rich diet 1–2 times daily. Live or frozen foods such as bloodworms, brine shrimp, and finely chopped fish enhance growth, color, and health.

Tank Setup & Care:
Provide a well-planted aquarium with open swimming areas, driftwood, and tall structures to mimic their natural habitat. Stable water parameters, frequent water changes, and low lighting help reduce stress and encourage natural behavior.

Additional Notes:
The Orinoco F1 Altum Angelfish is a rare and elegant species, ideal for experienced aquarists who appreciate its size, coloration, and unique presence in a freshwater community. Its distinct vertical stripes and imposing body shape make it a true showpiece in any large aquarium.