Overview
The Pirarucu / Arapaima (Arapaima gigas) is a advanced freshwater species known for its gray-green, red tail edge coloration. World's largest freshwater fish. Surface to Mid.
Origin & Appearance
Origin: Amazon Basin.
Colors: Gray-Green, Red tail edge.
Body Shape: Elongate (long/slender). Typical adult dimensions: 300.0 x 36.0 x 45.0.
Sexual Dimorphism: Minimal.
Tank & Water Requirements
| Min Tank Size | 2642 gallons |
| Temperature | 75–82°F |
| pH Range | 6–7.5 |
| Water Hardness (GH) | 3-10 |
| Bioload | very-high |
| Oxygen Demand | medium |
| Plant Safe | no |
| Aquarium Position | Surface to Mid |
Behavior & Activity
Massive surface-breathing cruiser; slow powerful tail beats; lunges at surface prey; air-gulping breaks
Speed: 55/100Aggression: 6/10diurnal
Breeding
Not practical
Common Diseases
💊 Hardy
Expert Notes
World's largest freshwater fish; public aquarium only