Appearance: They feature a dark gray to black base color with vibrant, irregular orange or red "tiger-like" markings.
Size & Growth: They grow rapidly, often reaching 10–14 inches (25–35 cm) in captivity. They can reach nearly a foot in length within their first year.
Lifespan: With proper care, they typically live 10 to 20 years.
Intelligence: They are considered among the smartest aquarium fish, capable of learning tricks and responding to human gestures.
Aquarium Care Essentials
Tank Size: A minimum of 75 gallons is recommended for a single adult, though PetSmart suggests 125 gallons for optimal health.
Water Conditions: They thrive in temperatures between 74–81°F (24–28°C) and a pH of 6.0–8.0.
Filtration: Oscars are "messy" eaters and produce significant waste, requiring heavy-duty filtration and weekly water changes of 20–30%.
Diet: As omnivores, they need a varied diet of high-quality cichlid pellets, supplemented with frozen or live foods like shrimp and bloodworms, plus some vegetable matter.
