Furry Diary

Not furry, but we like them anyway.

Raccoon Butterflyfish

Chaetodon lunula

Also called Crescent-masked butterflyfish, Lunule butterflyfish, Halfmoon butterflyfish, Moon butterflyfish, Redstriped butterflyfish

SpeciesShort profile

From Indo-Pacific: East Africa east to the Hawaiian, Marquesan and Ducie islands, north to southern Japan and south to Lord Howe and Rapa; also off East London, South Africa12

At a glance the quick version

Length20 cm123
Lifespan5 to 9 years21
Sizemedium

Wikipedia gives 5 to 7 years as typical in aquariums; FishBase gives a maximum reported age of 9 years

Raccoon-like face mask
Hardy and easy to care for
Helps control Aiptasia anemones
23

Looks how to spot one

Compressed, oval reef butterflyfish

A golden-yellow body with a black mask across the eyes and a broad white band behind it, much like a raccoon's face. Slanting reddish stripes cross the flanks, yellow stripes run behind the head, and a black spot sits at the base of the tail.23

Coloursyelloworangewhiteblack32

Personality what they are like

Peaceful and generally easygoing with other fish. It is most active around dusk and at night.321

Daily activity how busy a day looks

An active swimmer that likes open space and rockwork to search for food, and is largely nocturnal in the wild.12

Grooming and care the hands-on bits

Rated easy care, but it is not a reef fish because it will eat corals and other invertebrates. Feed several small meals a day. A shy new arrival can be encouraged to eat by offering small anemones.32

Home where they are happiest

A tank of at least 125 US gallons (about 475 L). Saltwater at 22 to 26 °C (72 to 78 °F), pH 8.1 to 8.4, specific gravity 1.020 to 1.025. Wild adults live on shallow reef flats of lagoons and seaward reefs, while juveniles use rocky inner reef flats and tide pools.31

Food basics what goes in the bowl

An omnivore. Offer meaty foods such as mysis shrimp, crustacean flesh and frozen preparations several times a day. In the wild it eats nudibranchs, tubeworm tentacles, other small invertebrates, algae and coral polyps.31

Company who they like around

Usually seen in pairs or small groups. Pairs are monogamous when breeding.12

The story where it all began

French naturalist Bernard Germain de Lacépède described the species in 1802 as Pomacentrus lunula, from a specimen from the Indian Ocean. The name lunula refers to the crescent-shaped markings on its face.2

Fun facts for the dinner table

  1. 1

    Its common name comes from the black eye mask and white band that look like a raccoon's face.2

  2. 2

    It is mainly active at night.1

  3. 3

    Reef keepers sometimes use it to eat pest Aiptasia and Majano anemones.2

  4. 4

    Young fish shelter in tide pools and rocky inner reef flats.1

Recognised by the official bits

IUCN Red List
Least Concern (assessed 2009)1

The care rhythm Furry Diary remembers it for you

A typical home-care rhythm for a Raccoon Butterflyfish. It is our own starting plan, not a vet's advice, and you can change every line in the app.

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Where this comes from

Every breed page shows where each fact comes from. If we got something wrong, sorry, we are pet people, not a science magazine. Tell us at support@furrydiary.app and we will fix it.

  1. FishBase: Chaetodon lunula, Raccoon butterflyfish fishbase.seused for distribution, length, depth, habitat, diet, behaviour, lifespan, IUCN status
  2. Wikipedia: Raccoon butterflyfish en.wikipedia.orgused for other names, colour description, lifespan in aquariums, Aiptasia control, history
  3. LiveAquaria: Raccoon Butterflyfish liveaquaria.comused for aquarium care, tank size, water parameters, temperament, diet, colours

Checked 2026-09-30. Text is written in our own words from these sources.