The bluejaw triggerfish is one of the most peaceful, reef-tolerant triggers, with males displaying a striking blue throat and gold fin margins. A graceful planktivore that suits larger reef and fish-only systems.
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Medium: reaches about 25-30 cm (10-12 in); males show a bright blue 'jaw' and yellow-margined fins.
Lifespan
8–15 years
Social needs
solo
Native region
Indo-Pacific (East Africa and Red Sea to Hawaii)
Origin
Old World
Climate
🌴 Tropical
Water type
🌊 Marine
Family
Balistidae
Genus
Xanthichthys
Part of the Triggerfish
Intelligent, charismatic reef fish with locking dorsal spines and powerful jaws; ranging from peaceful planktivores to boisterous personalities, they make engaging large-aquarium specimens.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Single specimen FOWLR
125 gal / 473 L FOWLR
Xanthichthys auromarginatus is one of the more reef-tolerant triggers, but still big and active. 125-gal FOWLR or reef-with-no-inverts minimum, with strong flow and open swim length.
Photo coming soon
Recommended
Pair reef-safe display
180 gal / 681 L display
180-gallon display for a male/female pair (males have the blue jaw), with branching rock, strong current, and reef-safe tankmates. Coral-safe in most cases; will eat shrimp and small crustaceans.
Photo coming soon
Ideal
Large display reef
240 gal+ / 909 L+ display
8-foot+ display reef where the pair can mid-water cruise constantly. Bluejaws spend most of the day in open water — length matters more than gallons.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
Photo coming soon
Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
Photo coming soon
Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Habitat & enclosure
Inhabits outer-reef slopes and current-swept drop-offs in the Indo-Pacific, where it feeds on zooplankton in open water. Provide a large aquarium of at least 470 L (125 gal) with live rock arranged to leave open swimming space and a few caves. Reef parameters: 24-27 C (75-80 F), salinity 1.020-1.025 SG, pH 8.1-8.4. One of the few triggers considered relatively reef-safe.
Substrate
Fine aragonite sand with substantial live rock for shelter and sleeping nooks. Leave broad open swimming areas, as this is an active midwater species rather than a rock-hugger.
Equipment & setup
Robust skimmer and biological filtration for a meaty-fed predator, strong circulation pumps, a heater, and a secure lid (triggers can jump). Standard reef lighting; no special UVB. Sturdy aquascape since larger triggers may rearrange light rockwork.
Diet
Planktivore and carnivore. Offer a varied meaty diet — mysis, krill, chopped seafood, and enriched frozen preparations — along with some marine algae/nori. Feed two or three times daily in smaller portions to mirror its natural midwater grazing. Hard foods help keep the ever-growing teeth worn.
Behavior & temperament
Among the most docile triggerfish, spending much of its time hovering in the water column. Generally peaceful toward tankmates and usually leaves corals alone, though it may sample shrimp and other small mobile invertebrates. Typically kept singly; a male-female pair can work in a very large tank. Not handleable, and like all triggers it can bite if cornered.
Health
Hardy and disease-resistant when well fed and given clean, stable, oxygen-rich water. Susceptible to marine ich and bacterial issues under stress; quarantine before adding. Provide strong flow and surface agitation, as it comes from current-rich, high-oxygen reef zones.
Tips, DIY & hacks
Buy a male for the namesake blue jaw and yellow fin edges; females are plainer. Keep current high and feed several small meals to reduce any nipping. Watch newly added shrimp and ornamental crabs, as even peaceful triggers can pick at them once settled.
