Astronotus ocellatus
The oscar is a large South American cichlid famous for its personality, colour morphs (tiger, red, albino), and willingness to interact with keepers. It grows quickly and needs a long, heavy-duty aquarium with excellent filtration—bioload is high. Territorial and predatory toward fish small enough to swallow; tankmates must be chosen with size and temperament in mind. Accepts pellets, frozen foods, and suitable fresh items; avoid mammalian meat as a staple. Not suitable for typical community nano or planted tanks.
Large cichlid pellets; frozen fish foods; earthworms; occasional shellfish; avoid fatty mammal meat.
Frequency: 1–2× daily
Variety supports colour; overfeeding fouls water fast in large cichlid systems.
Native Region: South America (Amazon, Orinoco, Paraná basins)
Slow rivers, floodplain lakes, and vegetated margins.
Very large tank, strong filtration, secure lid; driftwood and sand; minimal small fish as tankmates.
Activity Level: High
Recognises keeper; rearranges décor; can be hand-fed with care—watch fingers.
Difficulty: Moderate
Type: Egg layer
Sexual Dimorphism: Difficult when young; adults may show subtle differences; venting most reliable.
Open substrate or flat rock spawner; both parents guard eggs and fry; large tank required for breeding pairs.
Substrate: Sand
Plant Safe: Yes
Heavy rocks and wood—ensure stable stacking; uproots delicate plants.
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