Astronotus ocellatus
Oscar
Oscars are famous for their 'dog-like' personality. They are highly intelligent and can learn to recognize their owners. However, they grow very large, are extremely messy, and will eat any fish that fits in their mouth.
Ensure perfect water for Oscar ➔
Perfect for Aquaware Monitoring
Caution: Highly Sensitive
This species reacts immediately to unstable water parameters. Even minor fluctuations can be critical. Continuous 24/7 monitoring with Aquaware is highly recommended.
Temperature
23 - 27 °C
74 - 81 °F
pH Value
6.0 - 7.5 pH
Acidity Level
Mineral Content (TDS)
100 - 400 ppm
⚠️ Hard water required
Did you know?
Oscars are known to 'pout' or change color significantly when they are stressed or unhappy with a tank change.
Aquaware Pro Tip
Avoid live feeder fish to prevent disease; stick to high-quality prepared foods and occasional treats.
Natural Habitat
Slow-moving rivers and canals in the Amazon, Paraguay, and Orinoco basins.
Diet & Nutrition
Carnivore. Feeds on large pellets, crickets, earthworms, and frozen shrimp.
Behavior
Aggressive and territorial. Known for 'redecorating' their tank by moving gravel and plants.
Max Size
30-40 cm (12-16 inches)
Average adult size
Lifespan
10-12 years
Years with proper care
Swim Zone
Preferred tank region
Top 🐟
Mid 🐟
Bottom 🦞
Min. Tank
300 Liters
Recommended minimum size
Social
1 Fish
Solitary possible
Add. Space
150 L
Required per additional fish
(40 Gallons)
(40 Gallons)
💧 +150 Liters needed