Pennant coralfish (Heniochus acuminatus)

Classification (WoRMS)

Full classification as recorded by WoRMS: Kingdom: Animalia · Phylum: Chordata · Class: Teleostei · Order: Acanthuriformes · Family: Chaetodontidae · Genus: Heniochus.

Accepted name: Heniochus acuminatus · Authority: (Linnaeus, 1758) · Taxonomic status: accepted · AphiaID: 218765.

Synonyms and superseded combinations recorded for this taxon: Chaetodon acuminatus Linnaeus, 1758; Chaetodon bifasciatus Shaw, 1803; Chaetodon macrolepidotus Linnaeus, 1758; Chaetodon mycteryzans Gronow, 1854; Heniochus accuminatus (Linnaeus, 1758); Heniochus macrolepidotus (Linnaeus, 1758); Taurichthys macrolepidotus (Linnaeus, 1758).

Source: World Register of Marine Species (WoRMS) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=218765 (CC BY 4.0). Accessed 2026-09-25.

Biology and life history (FishBase)

Measured values published by FishBase for Heniochus acuminatus. Only fields the database actually holds for this species are shown; these are database values, not aquarium guidance.

Maximum length: 25 cm · Common length: 15 cm · Depth range: 2–178 m · Habitat zone: reef-associated · Body shape: short and / or deep · Vulnerability index: 15 of 100 · Fishery importance: minor commercial · Aquarium trade: commercial.

FishBase notes: Inhabit deep, protected lagoons and channels, and the deeper parts of outer reef slopes. Juveniles are often solitary while adults occur in pairs (Ref. 1602, 48636).

A planktivorous species that generally remains within a few meters of the reef. Juveniles may sometimes pick on parasites on the epidermis of other fish (Ref. 5503). Oviparous (Ref. 205). Form pairs during breeding (Ref. 205).

Source: FishBase species summary (SpecCode 5588) — https://www.fishbase.se/summary/Heniochus-acuminatus.html (CC BY-NC 3.0 — non-commercial use only). Accessed 2026-09-25.

Distribution and occurrence records (GBIF)

4,325 georeferenced occurrence records for Heniochus acuminatus are published through GBIF from 68 countries or marine areas. The map above plots 396 distinct locations from a sample of 3,000 records, omitting 66 inland records that carry an institution's coordinates rather than a collection site; it shows where the species has been observed and reported, not a modelled range.

Most records by country or area: Australia (1,864); New Caledonia (435); Thailand (203); Japan (182); Indonesia (136).

The full country table, WoRMS marine regions and the sampling notes are on this species' Distribution page.

Source: GBIF Occurrence Search (taxonKey 2385730) — https://www.gbif.org/occurrence/search?taxon_key=2385730&has_coordinate=true (records CC0 / CC BY); WoRMS distribution records (MarineRegions) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=218765 (CC BY 4.0); Natural Earth 110m basemap — https://www.naturalearthdata.com/ (public domain). Accessed 2026-09-25.

Conservation status (IUCN Red List)

The IUCN Red List assesses Heniochus acuminatus (Linnaeus, 1758) as Least Concern (code LC). No trend, population estimate or threat analysis is given here, because none is available from this source without the Red List API; follow the source link for the full assessment, including its date.

Source: IUCN Red List of Threatened Species (taxon 165626) — https://www.iucnredlist.org/species/165626/0; GBIF IUCN Red List category endpoint (taxonKey 2385730) — https://api.gbif.org/v1/species/2385730/iucnRedListCategory. Accessed 2026-09-25.

Description and natural history (Wikipedia)

The pennant coralfish is a small-sized fish that can reach a maximum length of 25 cm. However, the average size generally observed in the nature oscillates around 15 cm.

Its body is compressed laterally, the first rays of its dorsal fin stretch in a long white filament. The background color of its body is white with two large black diagonal bands. Beyond the second black stripe, the dorsal and the caudal fins are yellow. The pectoral fins are also yellow.

The head is white, the eyes are black and linked together by a black band. The snout, spotted with black, is a bit stretched with a small terminal protractile (it can be extend) mouth.

The juvenile doesn't have yet after the second black stripe any white area like adults.

The pennant coralfish can easily be confused with the quite similar schooling bannerfish, (Heniochus diphreutes). The main and visible differences are: a longer snout for the reef bannerfish and spots on its snout are darker, the pelvic fin of the reef bannerfish is longer and has a rounded end unlike the schooling bannerfish which has a smaller and more angular end.

Distribution and habitat

The pennant coralfish is widespread throughout the tropical and subtropical waters of the Indo-Pacific from the eastern coast of Africa, Red Sea included, to Polynesia and from south Japan to the south of the Great Barrier Reef.

The reef bannerfish likes relatively deep waters from protected lagoon, channels or outer reef slopes from 15 to 75 m deep.

Biology

The pennant coralfish lives in pairs and feeds on zooplankton in the water column, coral polyps and occasionally benthic invertebrates. Juveniles are solitary and can feed by cleaning other fishes.

Conservation status

The species is globally assessed as Least concern by the IUCN, however some local populations are in decline. Much like many other reef fish, the pennant coral fish is threatened in the Persian Gulf due to the fact several coral reefs have been damaged and severely fragmented with no contiguous coral assemblages.

Taxonomy

The pennant coralfish was first formally described as Chaetodon acuminatus in 1758 by Linnaeus in the 10th edition of Systema Natura. Linnaeus also described a species he named Chaetodon macrolepidotus which Georges Cuvier used as the type species for the genus Heniochus and which has since come to be regarded as a synonym of H. acuminatus.

Source: Wikipedia: Pennant coralfish — https://en.wikipedia.org/wiki/Pennant_coralfish (CC BY-SA 4.0). Accessed 2026-09-25.