Lemon Oscar Yellow Astronotus Ocellatus

Overview

The Lemon Oscar is a selectively bred yellow form of the South American Oscar, with a clean lemon body and reduced dark pigment. Like all Oscars it is heavy-bodied, intelligent and quickly learns to recognise its keeper. It suits keepers with a large, well-filtered aquarium who want a bright, characterful centrepiece fish.

• Adult Size: Around 30–35 cm (12–14 in) in aquaria; males sometimes slightly larger
• Lifespan: 10–15 years, sometimes up to 20

Origin

• Native to: Amazon and Orinoco basins, South America
• Habitat: Slow, silty shallows among tree roots and marginal plants

Feeding

• Diet: Omnivorous, favouring high-protein foods
• Preferred Foods: Cichlid pellets, earthworms, prawns, shrimp, insects, frozen krill
• Feeding Habits: Feed once daily, varying foods; skip feeder fish and mammal meat

Tank Mates

• Best with: Large robust cichlids, big characins, sturdy catfish such as plecs
• Avoid: Anything small enough to eat; timid or fin-nipping species

Aggression & Behaviour

• Temperament: Boisterous, predatory, intelligent and owner-aware
• Territoriality: Territorial, especially at feeding time and when pairing off

Experience Level

• Difficulty: Intermediate
• Challenges: Huge adult size, heavy waste load, strong filtration and weekly large water changes

Water Parameters

• Water Type: Freshwater, soft to moderately hard
• Temperature: 22–28°C (72–82°F)
• pH: 6.0–7.5
• Hardness: 5–20 dGH
• Flow: Slow to moderate
• Tank Size: Minimum 450 litres; 150 cm long footprint for a single adult; larger for pairs

Final Notes

Oscars grow fast, often reaching 20 cm within a year, so buy the full-size tank from the start. They rearrange decor, uproot plants and can knock heaters, so secure equipment and use a tight lid. Sexing is unreliable outside spawning; pairs are substrate spawners that lay on flat rocks and guard their fry fiercely. Give them space and variety and you will have a responsive, long-lived pet fish.