Saltwater Fish
Chaetodon lunulatus

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)

Overview

  • 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.

Feeding

  • 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.

Habitat

  • 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.

Fish Care

  • 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.

Compatibility

  • 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.

Aquarium Behavior

  • 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.

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