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The Dot-Dash Butterflyfish is a striking marine fish admired for its distinctive yellow body, unusual pattern of black spots and stripes, and graceful swimming behaviour. Scientifically known as Chaetodon pelewensis, it is also commonly called the Dot-and-Dash Butterflyfish or Sunset Butterflyfish.
Native to the tropical Western Pacific, the Dot-Dash Butterflyfish is found around coral-rich offshore reefs, where it is commonly seen swimming around reef structures and feeding on coral polyps and small benthic invertebrates. It occurs from Australia and Papua New Guinea across to Fiji, Samoa and the Tuamotu and Society Islands. In Australia, it is found along the Great Barrier Reef and southward to central New South Wales and Lord Howe Island.
This is a beautiful but specialised butterflyfish and is best suited to experienced marine aquarists. Its natural diet includes coral polyps, meaning it is generally not considered a suitable choice for a reef aquarium containing prized corals.
Common Name: Dot-Dash Butterflyfish
Scientific Name: Chaetodon pelewensis
Other Names: Dot-and-Dash Butterflyfish, Sunset Butterflyfish
Family: Chaetodontidae
Origin: Western Pacific
Care Level: Moderate to Difficult
Temperament: Generally Peaceful
Diet: Omnivore / Coralivore
Minimum Tank Size: 300 litres
Adult Size: Up to 12.5 cm
Lifespan: Approximately 5–10 years with excellent care
Reef Compatible: No
The species reaches approximately 12.5 cm in length and is associated with tropical reef environments at depths of roughly 1–30 metres.
The Dot-Dash Butterflyfish has a deep, laterally compressed body with a pale yellow to tan base colour. Its most distinctive feature is the pattern of black spots and diagonal markings across the body.
The dark markings become more solid toward the rear of the body, creating the characteristic "dot-and-dash" appearance. A prominent orange bar edged in black passes vertically through the eye, while the caudal peduncle is orange.
The dorsal and anal fins are edged with bright yellow, adding to the fish's vibrant appearance.
Its small, pointed mouth is adapted for picking food from coral surfaces and reef structures, reflecting its specialised natural feeding habits.
Dot-Dash Butterflyfish are generally peaceful fish and can be kept with a range of similarly peaceful marine species.
They are active but can initially be shy when introduced to a new aquarium. Providing plenty of rockwork, caves, and sheltered areas allows them to retreat while they become accustomed to their surroundings.
The species is often observed in pairs in the wild, particularly adults. However, keeping a single specimen is generally the safest option in a home aquarium unless a proven compatible pair is being maintained in a suitably large system.
Suitable tank mates include:
Avoid keeping them with:
A mature marine aquarium with extensive live rock, caves, overhangs, and open swimming areas provides an excellent environment for the Dot-Dash Butterflyfish.
A minimum aquarium size of around 300 litres should be considered, although a larger aquarium is strongly recommended for long-term care. The aquarium should be well established before introducing this species, with mature rockwork providing natural feeding opportunities.
Moderate water movement is appropriate, with stronger circulation in some areas and quieter zones where the fish can rest and feed.
The aquarium should contain plenty of open swimming space while still offering rockwork and hiding areas. A secure lid or mesh cover is recommended because newly introduced butterflyfish may jump when frightened.
Temperature: 24–27°C
Specific Gravity: 1.023–1.026
pH: 8.0–8.4
KH: 8–12 dKH
Ammonia: 0 ppm
Nitrite: 0 ppm
Nitrate: Ideally below 10–20 ppm
Stable and clean water is essential for maintaining the health of this species. Butterflyfish can be particularly sensitive to poor water quality and stress during acclimation.
Regular water changes, efficient biological filtration, good oxygenation, and stable salinity should be maintained.
Diet is one of the most important considerations when keeping a Dot-Dash Butterflyfish. In the wild, adults feed mainly on coral polyps and small benthic invertebrates.
Newly introduced specimens can initially be shy feeders, so offering a variety of foods is important.
Recommended foods include:
Feed small portions several times throughout the day, particularly while the fish is settling into the aquarium.
A varied diet can encourage feeding and help maintain body condition. Newly acquired specimens should be monitored carefully to ensure they are actually consuming food rather than simply investigating it.
Dot-Dash Butterflyfish are graceful and active reef fish that spend much of their time exploring rockwork and swimming through the open areas of the aquarium.
They naturally inspect reef surfaces with their specialised mouth, searching for coral polyps and small invertebrates. This feeding behaviour can be fascinating to observe in a mature marine aquarium.
Newly introduced specimens may be shy and spend considerable time hiding among the rocks. Once settled, they can become confident and regularly swim throughout the aquarium.
The species is commonly encountered in pairs, and adults may form long-term associations.
Dot-Dash Butterflyfish are egg-laying marine fish and are generally found in pairs when breeding.
Spawning occurs in the water column, with eggs and sperm released into open water. The eggs develop as part of the planktonic environment before the larvae eventually develop into juvenile fish.
Successful breeding and larval rearing in a home aquarium is extremely difficult. The tiny larvae require specialised live foods and carefully controlled conditions, making captive breeding a project generally suited to experienced marine fish breeders and specialised facilities.
The Dot-Dash Butterflyfish is not considered reef safe.
This is an important consideration when deciding whether to purchase one. The species naturally feeds on coral polyps and small benthic invertebrates, so it may nip at or consume desirable corals in a reef aquarium. For this reason, the Dot-Dash Butterflyfish is generally better suited to a fish-only-with-live-rock aquarium or a marine display where coral consumption is not a concern.
It may be possible to maintain one with hardy or less desirable coral species, but there is no guarantee that an individual will leave corals untouched.
The most important considerations when keeping a Dot-Dash Butterflyfish are aquarium maturity, correct nutrition, excellent water quality, and understanding its natural coral-feeding behaviour.
Provide a mature aquarium of at least 300 litres, with larger systems preferred. Include plenty of live rock, caves, overhangs, and open swimming areas.
Offer a varied diet of frozen marine foods and high-quality prepared foods several times throughout the day, particularly during the acclimation period. Closely monitor newly introduced fish to ensure they begin feeding properly.
Avoid aggressive tank mates and provide sheltered areas where the butterflyfish can retreat when stressed.
Because Chaetodon pelewensis naturally feeds on coral polyps, it should generally be considered unsuitable for a traditional coral reef aquarium. A large fish-only-with-live-rock system is a much safer environment for this species.
With proper acclimation, a mature aquarium, excellent water quality, and a carefully planned diet, the Dot-Dash Butterflyfish can become a spectacular feature fish. Its distinctive pattern, bright yellow colouration, and graceful swimming behaviour make it one of the more attractive butterflyfish for an experienced marine aquarist.
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