Blue Throat Triggerfish - Xanthichthys auromarginatus

Blue-throat Triggerfish (Xanthichthys auromarginatus)

The Blue-throat Triggerfish, Xanthichthys auromarginatus, is an impressive Indo-Pacific marine fish valued for its comparatively calm temperament and striking sexual colour differences. Also known as the Bluejaw Triggerfish, Gilded Triggerfish or Blue Face Triggerfish, adult males develop a vivid blue throat and lower face with bright yellow edging along the fins, while females are generally more subdued with grey-brown colouration and pale fin margins. Unlike many bottom-feeding triggerfish, this species spends much of its time swimming in open water and feeding on drifting plankton. It can be a suitable choice for a large, carefully managed reef aquarium, although its eventual size, powerful teeth and potential risk to small invertebrates must be considered.

Common Name:
Blue-throat Triggerfish, Bluejaw Triggerfish, Blue Face Triggerfish, Gilded Triggerfish, Golden-edged Triggerfish.

Scientific Name (Latin):
Xanthichthys auromarginatus

Maximum Size:
Capable of reaching approximately 30 cm when fully grown. Aquarium specimens commonly reach around 20–25 cm but should always be housed according to their potential adult size.

Water Type:
Marine

Origin / Natural Habitat:
Widely distributed throughout the Indo-Pacific, from South Africa and the western Indian Ocean eastwards to the Hawaiian Islands, north to southern Japan and south to Australia and New Caledonia. Blue-throat Triggerfish inhabit clear outer reef slopes, channels and drop-offs, usually in areas with strong currents and access to open water. They commonly swim above the reef while feeding on zooplankton and retreat into deep crevices or caves when threatened.

Water Parameters:
Temperature: 24–28°C
pH Range: 8.1–8.4
Hardness or Salinity: Marine salinity 1.023–1.026 specific gravity; maintain stable salinity, strong oxygenation, efficient filtration and consistently high water quality.

Temperament:
Generally peaceful to semi-aggressive for a triggerfish. Blue-throat Triggerfish are usually less territorial and destructive than many members of the triggerfish family, but established adults can still become assertive towards timid fish, newly introduced tank mates or other triggerfish. They are best housed with confident, similarly sized marine fish that will not be intimidated or easily swallowed.

Diet:
Omnivorous planktivore with a strong preference for animal-based foods. In the wild, this species feeds primarily on zooplankton and other small organisms collected from the water column. In the aquarium, offer enriched mysis shrimp, krill, chopped prawn, clam, mussel, squid, copepods, marine fish flesh and high-quality carnivore pellets. Some algae-based marine foods may also be accepted. Feed varied portions once or twice daily, avoiding excessive feeding that could contribute to obesity and poor water quality.

Minimum Tank Size:
A minimum aquarium volume of approximately 500 litres is recommended for one adult, with a long tank providing substantial open swimming space. A larger aquarium of 700 litres or more is preferable for a male and female pair or when keeping the species with several other large, active marine fish.

Behaviour & Activity:
An active open-water triggerfish that spends much of the day swimming through the middle and upper areas of the aquarium. It frequently faces into the current while searching for suspended food and uses reef caves or deep rock crevices as secure resting places. Like other triggerfish, it can raise and lock its strong first dorsal spine to wedge itself firmly into shelter. Established individuals often become bold and responsive at feeding time.

Reef Safe:
Reef Safe with Caution

Blue-throat Triggerfish are among the more reef-compatible triggerfish and do not usually feed directly on coral tissue. However, small ornamental shrimps, crabs, snails and other mobile invertebrates may be investigated, bitten or eaten, particularly by larger adults. Individual behaviour varies, and no triggerfish should be considered completely trustworthy with valuable invertebrates. Loose corals may also be displaced by an active adult.

Special Requirements or Care Notes:
Provide extensive open swimming room alongside large, firmly secured rock structures containing caves and deep retreats. Filtration and protein skimming should be appropriately oversized because adult triggerfish are substantial feeders and produce considerable waste. Strong, well-distributed water movement and high oxygen levels suit this naturally open-water species.

A tightly fitted, heavy aquarium cover is essential, as Blue-throat Triggerfish are powerful swimmers and may jump when startled. Avoid very small, delicate or slow-moving tank mates. Males and females can sometimes be maintained as a pair in a sufficiently large aquarium, but two males may become territorial. Use feeding tongs rather than fingers, as even a generally calm triggerfish has strong teeth and can deliver a painful bite.

Suitable for:
Intermediate to experienced fishkeepers

Availability:
Occasional in trade

All images are a visual representation of the fish you will receive, made to be as accurate as possible. Please note that Mother Nature is a wonderful thing, and variation in patterns and colours will occur — that is part of the unique beauty of these animals.