Species Description…

Scientific Name: Chaetodon lunulatus

Common Name: Oval Butterflyfish

Species Group: Butterflyfish

Habitat: Fish Only

Care Level: Advanced

Temperament: Peaceful

Diet Type: Carnivore

Role in Aquarium: Showpiece Fish

Max Fish Length: 5.5 (inches)

Min Aquarium Size: 185 (gallons)

Native Range: Pacific Ocean: from Japan and Australia to Hawaii and the Tuamotu Islands

Chaetodon Lunulatus - The Oval Butterflyfish

Chaetodon Lunulatus (The Oval Butterflyfish)

Native to the Indo-Pacific region, commonly found in coral reefs, lagoons, and coastal waters.
Distinguished by its vibrant yellow body, intricate blue markings, and striking red dorsal fin.
A specialized feeder that thrives in a well-maintained aquarium with proper care.
Typically observed in pairs or small groups, often swimming close to coral formations.
Best suited for experienced aquarists due to its specific dietary needs and sensitivity to water conditions.

Omnivorous, feeding on coral polyps, small invertebrates, and algae in the wild.
In captivity, it requires a varied diet of sponge-based foods, frozen mysis shrimp, and marine algae.
May be reluctant to accept prepared foods initially, so a slow transition is recommended.
Frequent small feedings throughout the day help sustain energy levels and digestion.
A nutrient-rich diet is essential to maintain its vibrant coloration and overall health.

Prefers coral-rich reef environments with abundant live rock structures.
Often found near reef slopes and sheltered coastal areas with moderate water currents.
Aquarium setups should include plenty of live rock to encourage natural grazing and provide shelter.
Requires high-quality water conditions with stable parameters to remain healthy.
Providing shaded areas and open swimming spaces helps reduce stress and encourages natural behaviors.

Optimal water temperature: 74-82°F (23-28°C) to support overall well-being.
Preferred pH range: 8.1-8.4, with a salinity level of 1.020-1.025.
Requires consistent water quality with frequent maintenance and water changes.
Not considered reef-safe, as it may consume soft corals and sessile invertebrates.
Providing live rock enhances grazing opportunities and supports natural behaviors.

Generally peaceful but may become territorial with other butterflyfish.
Compatible with tangs, angelfish, and other non-aggressive marine fish.
Not suitable for reef aquariums due to its tendency to nip at coral polyps.
Should be housed with similarly sized fish to avoid intimidation or food competition.
Providing adequate swimming space and defined territories helps maintain harmony in the aquarium.

An active and curious species that enjoys exploring its surroundings.
Frequently observed grazing on rock surfaces and interacting with tankmates.
May take time to adjust to captivity but becomes more comfortable with proper care.
Providing live rock encourages natural foraging behavior and keeps it engaged.
Over time, it may recognize its caretaker and show increased curiosity, particularly during feeding sessions.