Bony-tongue Arawana

The trade name Bony-tongue Arawana refers to members of the family Osteoglossidae — most commonly Osteoglossum bicirrhosum (Silver Arowana) or related species — highlighting their defining anatomical feature: a toothed tongue that occludes against a toothed palate to grip prey. This is the ancestral feature that defines the entire order Osteoglossiformes, one of the oldest lineages of bony fish, dating back over 100 million years. Care requirements mirror those of the Silver Arowana: pristine water, a very large long aquarium with a tight-fitting lid, and a diet of large meaty prey. Sold as captive-bred juveniles.

Water: 24-30°C, pH 6.0-7.0, soft to moderately hard; pristine conditions with regular large water changes. Tank: Minimum 1500L; long footprint; very secure lid; minimal decor to prevent injury. Feeding: Carnivore; large insects, prawns, whole fish, floating sticks; avoid feeder goldfish. Breeding: Paternal mouthbrooder; not feasible in home aquaria. Compatibility: Keep alone or with very large robust fish; predatory toward anything that fits in its mouth.