Banggai Cardinalfish care guide
Banggai Cardinalfish (Pterapogon kauderni) — minimum tank 100 L, temperature 24-28 °C, pH 8-8.4.
Compiled by Aquairi from published sources · Published · Updated
Overview
The Banggai Cardinalfish (Pterapogon kauderni) is a small reef fish with a silvery body crossed by three black bars and white-edged elongated fins covered with bright white spots. It is the sole species of its genus and is restricted to a tiny natural range.
Taxonomy
- Family: Apogonidae
- Genus: Pterapogon
- Scientific name: Pterapogon kauderni
- Common synonyms: Kaudern's Cardinalfish
Habitat
Endemic to a small archipelago around the Banggai Islands in central Indonesia, where it occurs in shallow sheltered seagrass and coral-rubble habitats at 0.5-5 metres depth. Juveniles shelter among the spines of long-spined sea urchins (Diadema setosum) and anemones.
Tank requirements
- Minimum tank volume: 100 L (26.4 US gal)
- Adult size: 6-8 cm
- Temperature: 24-28 °C (75-82 °F)
- pH: 8-8.4
- GH: 8-12 °dGH
- Water flow: low
- Lifespan: 3-5 years
- Salinity: SG 1.024-1.026
- Carbonate hardness (dKH): 8-12
- School size: ≥3 individuals
Diet
A diurnal micropredator that takes small zooplankton, copepods and amphipods from the water column. In aquaria it accepts frozen mysis, enriched brine shrimp, marine pellets and quality flake; offer several small daily feedings.
Compatibility
Peaceful with most tankmates but intraspecifically aggressive; pairs aggressively exclude additional adults from their territory. Best maintained as a single individual or as a bonded pair in any but very large tanks. Suitable companions include clownfish, Royal Gramma, Yellowtail Damsel, gobies and small wrasses.
Reef compatibility
Reef-safe. Does not harm corals or sessile invertebrates and typically hovers above the rockwork; pairs with the long-spined urchin Diadema or anemones in nature, but these hosts are not essential in captivity.
Breeding
A paternal mouthbrooder. The male incubates around 30-90 eggs in his buccal cavity for roughly 25 days and continues to shelter the fully formed juveniles for several additional days; no pelagic larval phase exists, which makes captive breeding particularly practical.
Conservation status
IUCN Red List: Endangered. The natural range is exceptionally small and wild populations have declined sharply due to the aquarium trade; captive-bred stock is widely available and is strongly preferred over wild-caught individuals.
Banggai Cardinalfish Breeding Guide (Pterapogon kauderni)
Overview
Pterapogon kauderni is a marine fish endemic to the Banggai Islands of Indonesia and a paternal mouthbrooder. Because the male broods the eggs and the species lacks a planktonic stage in its life history, captive breeding is achievable and aquacultured individuals now dominate the market as an alternative to wild-caught fish. This makes it one of the more accessible marine species to breed at home.
Sexing
Males and females appear nearly identical. The male can be differentiated from the female by a conspicuous, enlarged oral cavity, but this is apparent only when he is brooding. Pairs typically form a few hours to a few days before spawning and establish a defended territory.
Conditioning
Maintain stable marine water and feed the carnivorous diet this species requires to bring a compatible pair into condition. Allowing a pair to form and defend a territory within the tank is part of preparing them to spawn, since pairing precedes spawning by hours to days.
Breeding Setup
Provide a calm marine aquarium with space for a pair to establish and defend a territory. Because the male carries the brood in his mouth, no spawning substrate or nest is required; the priority is stable water quality and minimal disturbance to the brooding male.
Spawning Behavior & Trigger
Females actively initiate courtship. The female produces no more than 90 eggs, each 2-3 mm in diameter, and the egg transfer to the male is immediate, taking no more than two seconds. The male then incubates the eggs orally for approximately 30 days, during which he does not feed.
Egg & Fry Care
Because there is no planktonic larval stage, juveniles develop fully within the father's mouth cavity and are released as formed juveniles rather than free-floating larvae. The released young are comparatively large and can be reared on suitably sized prey, which is a key reason this species is bred successfully in captivity.
Common Challenges
The brooding male fasts for about a month, so his condition before spawning matters and disturbance must be minimised. Juveniles emerge needing appropriately sized live foods, and because adults can be intolerant of conspecifics, managing pairs and the released young to avoid aggression is an ongoing concern.