“The bannerfish glides through the reef with that impossibly long white fin trailing behind it — the reef’s own pennant, raised in permanent celebration.”
Bannerfish of the Great Barrier Reef – Elegance in Motion
Bannerfish are among the most elegant and easily recognised fish on the Great Barrier Reef. Related to butterflyfish, they’re distinguished by a dramatically elongated dorsal fin that streams behind them as they swim — giving them an appearance unlike any other reef fish.
About Bannerfish
Several bannerfish species are recorded on the Great Barrier Reef, including the Schooling Bannerfish (Heniochus diphreutes), the Masked Bannerfish (Heniochus monoceros) and the Horned Bannerfish (Heniochus varius), while the Longfin Bannerfish (Heniochus acuminatus) is a close look-alike of the Schooling Bannerfish. Most display the characteristic black and white banding pattern and the sweeping white dorsal fin, but differ subtly in their markings and facial features.
Bannerfish are often confused with Moorish Idols — another striped, high-finned reef fish — though bannerfish have a more rounded snout and a distinctly different body shape when viewed side by side.
They typically move in pairs or small groups, often hovering at mid-water above coral formations. In some areas, they form larger schools of 20 or more fish, creating spectacular displays of synchronised movement across the reef wall.
Behaviour and Diet
Diet depends on the species. Schooling and Longfin Bannerfish hover above the reef picking zooplankton from the current, the Masked Bannerfish eats small bottom-dwelling animals such as worms, and the Pennant, Horned and Singular Bannerfish feed mainly on coral polyps.
They’re diurnal fish — active during the day and returning to shelter among the coral heads at night.
Quick Facts About Bannerfish
- Scientific name: genus Heniochus (butterflyfish family, Chaetodontidae)
- Also known as: pennant coralfish, bullfish; the Schooling Bannerfish is also called the False Moorish Idol
- Found in: coral-rich lagoons and seaward reefs; Schooling Bannerfish gather above deeper outer reef slopes
- Diet: depends on the species, from zooplankton to bottom-dwelling invertebrates and coral polyps
- Size: about 18–25 cm, depending on the species
- Lifespan: not well documented
- Best chance of sighting: coral-rich lagoons and reef slopes; Schooling Bannerfish in large groups above outer reef slopes
Scientific Classification
- Kingdom: Animalia
- Phylum: Chordata
- Class: Actinopterygii (ray-finned fishes)
- Order: Acanthuriformes (formerly Perciformes)
- Family: Chaetodontidae (butterflyfishes)
- Genus: Heniochus
- Conservation status: the reef species are listed as Least Concern (IUCN)
Common Names
- Primary common name: Bannerfish
- Other names: pennant coralfish, bullfish, coachman
Bannerfish of the Great Barrier Reef
- Schooling Bannerfish (Heniochus diphreutes)
- Masked Bannerfish (Heniochus monoceros)
- Horned Bannerfish, also called Humphead Bannerfish (Heniochus varius)
- Singular Bannerfish (Heniochus singularius)
- Pennant Bannerfish (Heniochus chrysostomus)
- Longfin Bannerfish (Heniochus acuminatus), found in tropical northern Australia
Identification Notes
The Longfin and Schooling Bannerfish are both silvery-white with two diagonal black bands and are very hard to tell apart: on the Schooling Bannerfish the second black band ends at about the corner of the anal fin, and it has a shorter snout. The Moorish Idol looks similar but belongs to a different family and has a yellow saddle across its long, tube-shaped snout.
Role on the Reef
Bannerfish are butterflyfish, and several species depend on living coral for food. Young Longfin Bannerfish and Schooling Bannerfish sometimes pick parasites off other fish, acting as part-time cleaners. Schooling Bannerfish gather in large groups, while Longfin adults are usually seen in pairs.
Learning about reef fish in class? We help schools, universities and study groups plan educational trips to the Great Barrier Reef. Depending on the program, groups can enjoy guided snorkelling and marine biology presentations.
Great Barrier Reef Educational Groups →
Where to See Bannerfish
Bannerfish are found on coral reefs across the Great Barrier Reef, from fringing reefs near the coast to the outer reefs, and are often seen on reef tours from Cairns, Port Douglas, and the Whitsundays.
A Hot Getaways destination. Where Care is Our Compass.
FAQs
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