Overview
The Oscar (Astronotus ocellatus) is a intermediate freshwater species known for its dark brown-black, orange-red markings coloration. Intelligent. Mid.
Origin & Appearance
Origin: South America.
Colors: Dark Brown-Black, Orange-Red markings.
Body Shape: Deep Fusiform (oval/robust). Typical adult dimensions: 45.0 x 9.0 x 18.0.
Sexual Dimorphism: Minimal; difficult to sex externally.
Tank & Water Requirements
| Min Tank Size | 125 gallons |
| Temperature | 73–82°F |
| pH Range | 6–7.5 |
| Water Hardness (GH) | 5-15 |
| Bioload | very-high |
| Oxygen Demand | high |
| Plant Safe | mostly |
| Aquarium Position | Mid |
Behavior & Activity
Intelligent slow cruiser; deliberate mid-level movement with personality; follows owner along tank glass; sudden lunges at food
Speed: 40/100Aggression: 6/10diurnal
Breeding
Moderate; substrate spawner
Common Diseases
💊 Hole in the head (HITH)💊 ich
Expert Notes
Intelligent; grows very large