Heniochus chrysostomus

Datasheet

General Description

The Threeband pennantfish (Heniochus chrysostomus) is known for its striking long dorsal fin, hence its common name Bannerfish. Belonging to the Chaetodontidae family, these fish are part of the Butterflyfish group, characterized by attractive colors and patterns. They lack the distinctive spines found on Angelfish, with some species like H. acuminatus and H. diphreutes being easier to maintain and often considered reef-safe if adequately fed.

Aquarium Suitability

Considered suitable for aquariums with care, the Threeband pennantfish require frequent feeding multiple times a day, particularly when introduced to a new environment. They generally do well either on their own or in groups and need ample space for swimming as they enjoy swimming activities. These fish thrive best in tanks with hiding places like live rocks to provide security.

Demands, Care, and Hardiness

With an average hardiness level, these peaceful fish are generally compatible with other species in the tank. They demand good care, including a varied diet of invertebrates, small crustaceans, and zooplankton to maintain their health. Their preferred water conditions include a pH range of 8.1-8.4, a temperature of 22.2-25.6°C, and a specific gravity of 1.020-1.025.

Reef Suitability

While the Threeband pennantfish is considered suitable for aquariums, they are not reef-safe due to their tendency to nibble at clams, including Tridacna species, and feed on tubeworms. As such, caution is advised when keeping them in reef tank setups.

Aquarium Setup

For the ideal aquarium setup for Threeband pennantfish, a tank size of at least 400 liters is recommended. The tank should provide ample swimming space, hiding spots, and a diverse environment resembling their natural habitat, which typically includes live corals, rocks, and various invertebrates for them to feed on.

Behaviour

These fish are peaceful and generally ignore other tank mates. However, similar species should be kept together only if they form a pair to avoid territorial disputes. Adjusting to aquarium life and feeding habits can be challenging, so acquiring healthy specimens free from parasites or infections is crucial.

Feeding and Diet

Threeband pennantfish have a specific diet that includes large polyp stone coral (LPS), small polyp stone coral (SPS), and soft coral. They must be offered a varied diet consisting of live and frozen foods like small crustaceans, zooplankton, and other invertebrates to meet their nutritional needs adequately.

Dimorphism

Captive reproduction of the Threeband pennantfish is possible in some circumstances, where they can be trained to consume frozen foods as a replacement for their natural diet. Successful breeding typically involves providing a diet that mimics their natural feeding habits and habitat preferences.

Habitat and Distribution

Found in the Indo-Pacific region from Western India to the Pitcairn Islands, northern Japan, and southern Queensland, the Threeband pennantfish thrives in various environments, from shallow coastal regions to deeper waters. Their distribution extends across Micronesia, showcasing their adaptability to diverse habitats within the region.