Can Arapaima and Dourada Live Together?
Keeping Arapaima and Dourada together is possible but requires caution due to mismatched flow preferences. Provide a spacious tank of at least 15000 litres with plenty of hiding spots to reduce stress. Monitor behaviour closely, especially during the first few weeks.
At a Glance
Can your tank handle Arapaima and Dourada?
Compatibility is only part of the answer. Test both fish with your real tank size, current stock, and maintenance needs to see if you have enough space and a safe stocking level before you add them.
Behaviour & Temperament
Arapaima is a semi-aggressive species (7/10), while Dourada is moderately assertive (6/10). This modest difference means Arapaima may occasionally assert dominance over Dourada.
Arapaima and Dourada both frequent the Middle (Open Water) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.
Worth noting: Arapaima is a known jumper, so a tight-fitting lid is essential.
Water Parameters
The safe temperature window for both species falls between 24°C and 29°C. Aim for the midpoint of this range (around 26.5°C) for optimal comfort.
Both fish can tolerate a pH between 6 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 2–15 dGH. Regular testing will ensure conditions stay within this range.
Tank Setup
To house Arapaima and Dourada together, plan for an aquarium of at least 15000 litres with a minimum length of 600 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.
Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.
Specific environmental needs for this combination include: Sand (Sifters), Smooth Gravel (Sensitive Barbels). Meeting these requirements will help both species thrive.
Arapaima prefers Low (Still Water) flow while Dourada needs High (River/Stream) flow. Consider positioning filter outlets and using baffles to create zones of different current intensity within the same tank.
Why This Pairing Needs Extra Planning in Practice
This pairing usually fails when the tank is treated like a standard mixed community and the caution flags are ignored. Arapaima and Dourada need extra room, more cover, and closer observation during the first few weeks so small aggression, feeding, or territory issues do not snowball into a long-term problem.
Frequently Asked Questions
Can Arapaima and Dourada live together?
They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 15000 litres), plenty of hiding spots, and watch for signs of stress or aggression.
What size tank do Arapaima and Dourada need?
A minimum of 15000 litres (tank length at least 600 cm) is recommended. This provides enough space for both species to establish their own areas and reduces the likelihood of territorial disputes.
What water temperature is best for Arapaima and Dourada together?
Keep the aquarium between 24°C and 29°C. A target of around 26.5°C sits comfortably within both species' preferred ranges.
Are Arapaima or Dourada aggressive?
Arapaima is semi-aggressive (7/10) and Dourada is moderately assertive (6/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Arapaima and Dourada need?
Both species overlap in the 6–7.5 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Shared setup supplies
We may earn from qualifying purchases
Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 4, 2026
- Last updated
- May 4, 2026
- Issues or corrections?
- Contact the editorial team
Related Comparisons
Arapaima & Orangespotted Snakehead
·
Arapaima & Rainbow Snakehead
·
Arapaima & Shortnose Gar
·
Arapaima & Tropical Gar
·
Arapaima & African Butterfly Fish
·
Arapaima & African Knifefish
·
Dourada & Chao Phraya Giant Catfish (Paroon Shark)
·
Dourada & Piraiba
·
Dourada & Adonis Pleco
·
Dourada & Asian Upside Down Catfish
·
Dourada & Bullseye Catfish
·
Dourada & Channel Catfish
·