Blue-jaw Triggerfish (Xanthichthys auromarginatus) Care Guide
The most reef-safe triggerfish available, with males sporting a stunning blue chin and golden-edged fins. Planktivorous rather than benthic, so it does not dig or rearrange rocks.
Compiled by Aquairi from published sources · Published · Updated
Overview
Xanthichthys auromarginatus is a species in the family Balistidae. The most reef-safe triggerfish available, with males sporting a stunning blue chin and golden-edged fins. Planktivorous rather than benthic, so it does not dig or rearrange rocks. Relatively peaceful for a trigger. Males and females look very different (sexual dimorphism).
Taxonomy
- Family: Balistidae
- Genus: Xanthichthys
- Scientific name: Xanthichthys auromarginatus
- Other names: Bluechin Triggerfish, Gilded Triggerfish
- Origin: Indo-Pacific
Habitat
Xanthichthys auromarginatus is a planktivorous triggerfish of Indo-Pacific reef slopes, where it feeds on zooplankton in open water above the reef. Males bear a blue jaw. It is comparatively reef-tolerant for a trigger but may sample some invertebrates.
Tank requirements
- Minimum tank volume: 400 L
- Temperature: 24-27 °C
- pH: 8.1-8.4
- Salinity: SG 1.024-1.026
- KH: 8-12 dKH
- Water flow: moderate
- Adult size: 18-22 cm
- Lifespan: 8-12 years
- Difficulty: intermediate
Diet
Classified as carnivore. Recommended feeding frequency: 2x daily. In captivity, offer a varied diet appropriate to the species — quality prepared foods supplemented with frozen or live items of suitable size.
Compatibility
- Temperament: semi-aggressive
- Position in tank: middle
- Compatible tank mates: Tangs, Wrasses, Clownfish, Angelfish
- Avoid with: Other Triggerfish, Small Shrimp
Reef compatibility
Generally classified as reef-safe with caution: may disturb other sessile invertebrates, sting neighbouring corals or prey on small ornamental shrimps, so placement and tankmates need consideration.
Breeding
- Breeding strategy: egg-layer
- Breeding difficulty: advanced
Blue-jaw Triggerfish Breeding Guide
Overview
The blue-jaw, bluechin or gilded triggerfish (Xanthichthys auromarginatus) is an Indo-Pacific triggerfish ranging from East Africa to Hawaii, usually at depths of 20-50 m (recorded between 8 and 161 m) and reaching roughly 10-30 cm. It is planktivorous rather than benthic. Home breeding is not established; the following describes documented wild reproduction. It is typically found toward the deeper end of its range and is rarer above 20 m, and it is the second-smallest species in its genus.
Sexing
This species is strongly sexually dimorphic. Males show a blue cheek patch on the underside of the head and yellow-bordered white second dorsal, anal and caudal fins, whereas females lack these and instead have brown-margined fins.
Conditioning
No home conditioning protocol is documented. The natural diet consists almost exclusively of zooplankton, primarily calanoid copepods, so the species is a mid-water planktivore rather than a substrate digger.
Spawning Behaviour & Trigger
Reproduction is oviparous and occurs as single male-female pairs. The preferred spawning site is sandy substrate on reefs, with spawning usually taking place in the early morning. A female releases roughly 55,500 to 430,000 eggs per spawning event.
Egg & Fry Care
The eggs attach to the sand and hatch on the evening of the same day. Both parental and biparental care occur within triggerfish; after hatching the larvae enter open water, which is the stage that has prevented hobbyist rearing.
Common Challenges
Even though this is among the more reef-tolerant triggerfish and lays demersal eggs, it is not bred in home aquaria. The large adult size, paired territorial spawning and open-water larval phase make captive reproduction impractical for hobbyists.