Pennant Coralfish
Heniochus acuminatus · Fish, Vertebrate, Cold-blooded, Wild
Animal Family
Family Chaetodontidae, order Perciformes, class Actinopterygii
Animal Category
Marine Animal
Breed / Variety
Heniochus acuminatus (Longfin Bannerfish or Pennant Coralfish)
Conservation Status
Least Concern according to the IUCN Red List, with stable populations distributed widely across the Indo-Pacific coral reefs.
About This Creature
Deep-bodied, laterally compressed disc shape with distinctive contrasting vertical black and white bands and a bright yellow rear body and fins. Famous for its extremely elongated fourth dorsal fin spine resembling a white pennant or banner. Typically grows to about 15 to 25 centimeters in length.
Physical Characteristics
Deep disc-shaped body, small protruding snout with a small mouth containing brush-like teeth, large rounded eyes, and the signature white filamentous streamer extending from the fourth dorsal spine. The body features prominent broad black vertical bands over a stark white background transitioning to vibrant yellow on the posterior dorsal, anal, and caudal fins.
Behavior & Temperament
Generally peaceful and social, often found in pairs or small groups, sometimes forming large schools. Diurnal, active during daylight hours exploring coral reefs for food. They often engage in cleaning behaviors, picking parasites off larger fish.
Habitat & Diet
Origin Region
Indo-Pacific region, from the Red Sea and East Africa to Indonesia, Japan, and the Society Islands
Habitat
Ocean/Marine, Coral Reef; Aquatic
Diet & Nutrition
Omnivorous; feeds on zooplankton, benthic invertebrates, and coral polyps. Forages actively along reef structures during the day.
Lifespan & Health
Typically lives 5 to 8 years or more in the wild, and can live longer in well-maintained marine aquariums. Subject to common marine fish diseases like cryptocaryon (marine ich) and lymphocystis.
Special Characteristics
Known for their mutualistic cleaning stations where they service larger predatory reef fish. Popular in the marine aquarium trade due to striking coloration and unique fin extensions.
Ecological Information
Acts as an important part of the coral reef food web, helping control invertebrate and zooplankton populations and occasionally serving as cleaner fish that maintain the health of other reef species.