Altum Angelfish (Pterophyllum altum) – Orinoco

The Orinoco Altum Angelfish (Pterophyllum altum) is widely considered the most majestic and largest species of angelfish in the aquarium hobby. Native to the Orinoco River Basin in Venezuela and Colombia, this species is admired for its extremely tall body, elegant fins, and bold vertical striping.

Often referred to as the “King of Angelfish,” Altum Angelfish have a dramatic appearance that immediately distinguishes them from the more common angelfish species. Their tall triangular body, extended fins, and graceful swimming movement make them a spectacular centerpiece fish for large freshwater aquariums.

Wild Orinoco Altums are especially prized among serious aquarists due to their natural beauty and impressive size.

Natural Habitat

In the wild, Orinoco Altum Angelfish inhabit slow-moving blackwater tributaries and flooded forest areas of the Orinoco River system. These waters are typically warm, soft, and acidic with large amounts of tannins released from decaying leaves and wood.

Typical habitat conditions include:

• Warm tropical temperatures

• Soft, acidic blackwater

• Dense submerged roots and branches

• Low mineral content

• Calm or slow-moving water

These conditions create the ideal environment for Altum Angelfish to thrive.

Physical Characteristics

Altum Angelfish are easily recognized by several distinctive features:

• Extremely tall body profile
• Long dorsal and anal fins
• Bold vertical black stripes across the body
• Distinct notch or dip above the forehead
• Silver body coloration with subtle bronze highlights

This species can reach impressive dimensions compared to other angelfish.

Average Adult Size

• Length: up to 6–7 inches (15–18 cm)

• Height: up to 12 inches (30 cm) including fins

Their height and elegance make them one of the most impressive freshwater aquarium fish available.

Behavior & Compatibility

Despite belonging to the cichlid family, Altum Angelfish are generally peaceful and calm fish when kept in appropriate conditions. They are social and often do best when kept in small groups in large aquariums.

Suitable tank mates may include:

• Peaceful tetras

• Corydoras catfish

• Peaceful dwarf cichlids

• Other calm community fish

However, small shrimp or tiny fish may be seen as food.

Ideal Aquarium Setup

Altum Angelfish require large aquariums with significant vertical height due to their tall body structure.

A suitable aquarium should include:

• Tall tanks with plenty of swimming space
• Driftwood and natural decorations
• Dense aquatic plants
• Gentle water movement
• Dim lighting or tannin-stained water

Replicating a blackwater environment using botanicals such as Indian almond leaves or driftwood can help them feel more comfortable.

Diet and Feeding

Altum Angelfish are omnivorous with a preference for protein-rich foods.

Recommended foods include:

• High-quality pellets
• Frozen bloodworms
• Brine shrimp
• Daphnia
• Occasional live foods

A varied diet helps maintain their health, growth, and coloration.

Recommended Tank Parameters

Temperature: 80 – 86°F (27 – 30°C)
pH: 5.0 – 6.8
KH: 0 – 3 dKH
Minimum Tank Size: 75 gallons or larger

Stable water conditions are very important for this species.

Origin

Wild Altum Angelfish originate from the Orinoco River Basin in northern South America, particularly in Venezuela and Colombia. Many specimens in the aquarium trade are wild-caught, though captive-bred populations are becoming more available.

Add elegance and prestige to your aquarium with the Orinoco Altum Angelfish, one of the most iconic and admired freshwater angelfish species in the world.