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Blue-throat Triggerfish
Xanthichthys auromarginatus
Animalia›Chordata›Actinopterygii›Tetraodontiformes›Balistidae
📍 Indo-Pacific
The most reef-safe triggerfish. Males develop a vivid blue throat patch. Open-water plankton feeder rather than a coral destroyer. One of very few triggers that can be kept in reef aquariums. Hardy and active.
Care Guide
Diet
Blue-throat Triggerfish are opportunistic omnivores that primarily feed on zooplankton, small crustaceans, and meaty foods in the aquarium. Offer a varied diet of high-quality marine flakes, small pellets, frozen mysis shrimp, and brine shrimp once daily. Supplement occasionally with chopped squid or small pieces of fish to maintain nutrition and coloration.
Behavior
This species is notably less aggressive than most triggerfish, making it one of the few suitable for reef environments. They are active mid-water swimmers that spend much of their time hunting for plankton and small prey, displaying curious and intelligent behavior. Males develop striking blue throat patches during breeding season and may exhibit territorial behavior, but they generally tolerate tank mates better than other trigger species.
Breeding
Breeding Blue-throat Triggerfish in captivity is extremely rare and difficult, requiring very large tanks and specific environmental conditions. Pairs may spawn in established reef systems, but larvae rearing is nearly impossible in home aquariums. Most specimens in the hobby are wild-caught, and successful captive breeding is not well-documented.
Tank Mates
Similar reef-safe temperament and mid-water swimming habits; generally compatible in larger tanks
Active reef fish with similar dietary needs; may compete for food but rarely aggressive toward triggers
Bottom-dwelling goby that occupies different tank zone; peaceful and reef-compatible
May be eaten if trigger is hungry; monitor closely but often tolerated due to trigger's plankton-feeding nature
Fast-moving bottom dweller that avoids competition; peaceful coexistence in reef settings
Small reef goby with different feeding zone; provides cleaning services and rarely conflicts with triggers
Common Diseases
Ich (Cryptocaryon irritans)
White spots on body and fins, rapid breathing, flashing against rocks, lethargy
Raise temperature gradually to 28-29°C, perform daily 25% water changes, use copper-free ich medication or UV sterilization; quarantine new fish before introduction
Marine Velvet (Amyloodinium ocellatum)
Fine white or gold dust coating on body, rapid breathing, loss of appetite, scratching behavior
Increase aeration, perform daily water changes, use copper-free treatments or hyposalinity (SG 1.015-1.017) for 3-4 weeks; quarantine affected fish
Bacterial Infections
Torn fins, open sores, cloudy eyes, lethargy, loss of appetite
Maintain excellent water quality with frequent changes, use antibiotic medications if severe, ensure adequate nutrition and low stress environment
Parasitic Copepods
Visible small crustaceans on body, scratching, irritation, potential fin damage
Manual removal with tweezers, freshwater dips (2-3 minutes), copper-free parasite treatments, or UV sterilization of incoming water
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Quick Facts
- pH
- 8.1–8.4
- diet
- omnivore/zooplankton
- maxSize
- 12 inches
- salinity
- SG 1.020–1.025
- minTankSize
- 75 gallons
- temperature
- 73–81°F (23–27°C)
Temperature
73–81°F
23–27°C