Arawana (Osteoglossum bicirrhosum)

Family: Osteoglossidae

A peaceful carnivore osteoglossidae from the Amazon basin in South America — advanced care.

Care parameters

Water temperature: 24–30 °C
pH: 6.5–7.5
GH hardness: 5–15 dGH
Adult length: 63–90 cm
Minimum tank: 900 L
Water layer: Upper; surface-oriented
Difficulty: Advanced
Temperament: Semi-aggressive; predatory — keep singly
Origin: 南美洲亚马逊河流域

Species overview

A Osteoglossidae species: Osteoglossum bicirrhosum lives upper; surface-oriented over clear streams, rivers and still waters. Semi-aggressive; predatory — keep singly. Adults reach 63–90 cm. In a community tank it pairs well with Gold carp, Indonesian snakehead.

Native biotope

Habitat: Clear streams, rivers and still waters
Flow: Moderate flow
Dissolved O₂: Average oxygen needs

Aquascape & hardware

Substrate: Smooth gravel and sand with open floor space
Hardscape: Driftwood, water-worn stones and shelters that mimic the native biotope
Plants: Hardy plants on hardscape; keep the floor open

Temperament, diet & tankmates

Schooling: Solitary, pairs or small groups
Diet: Carnivore; quality prepared foods with variety; regular frozen or live foods
Recommended tankmates: Gold carp — Similar size and water needs
Indonesian snakehead — Similar size and water needs
Asian Snakehead — Similar size and water needs
Avoid keeping with: Fish under half its size — May be eaten
Small fish and shrimp — Live-prey size

Breeding & notes

Sexual dimorphism: Males are typically slimmer and more intensely colored; females fuller-bodied
Breeding method: Spawning; condition with rich foods and simulate seasonal changes

Frequently asked questions

Is Arawana easy to keep?

Rated advanced — semi-aggressive; predatory — keep singly. Demanding water conditions; best for experienced keepers.

What temperature and water chemistry does Arawana need?

Aim for 24–30 °C. Heater required for stable tropical warmth; 24–30 °C recorded range.

How big does Arawana get, and what tank size?

Expect 63–90 cm as an adult, living upper; surface-oriented. A 900 L tank or larger gives it room.

What does Arawana eat?

Carnivore; quality prepared foods with variety; regular frozen or live foods. Feed two small meals a day rather than one large one.

Can Arawana live with other fish?

Semi-aggressive; predatory — keep singly. Recommended tankmates: Gold carp — Similar size and water needs, Indonesian snakehead — Similar size and water needs, Asian Snakehead — Similar size and water needs. Avoid Fish under half its size — May be eaten, Small fish and shrimp — Live-prey size.

Where does Arawana come from?

Its home waters are 南美洲亚马逊河流域 — clear streams, rivers and still waters, with moderate flow.

Does Arawana jump?

It can jump when startled — keep the tank tightly covered, especially at night and during maintenance.

How does Arawana breed?

Spawning; condition with rich foods and simulate seasonal changes. Males are typically slimmer and more intensely colored; females fuller-bodied.