Gilded Triggerfish / Blue Throat Triggerfish (Xanthichthys auromarginatus)
• Small fish safe: ✅ Yes (one of the most peaceful triggerfish)
• Small invert safe: ⚠️ With caution (generally safe but may eat small shrimp)
• Coral safe: ✅ Yes (one of the few truly reef-safe triggerfish)
• Minimum tank size: 500 liters (130 gallons) for juveniles, 750+ liters (200+ gallons) for adults
• Adult size: Up to 30 cm (12 inches)
• Diet: Carnivorous, primarily feeding on plankton and small invertebrates
• Be aware of: One of the most peaceful triggerfish; requires open swimming space; males develop a vibrant blue throat during spawning season
Appearance and Coloration
The Blue Throat Triggerfish is one of the most striking and reef-safe trigger species. Males are distinguished by a brilliant blue patch on their throat and lower jaw, which becomes more intense during breeding periods. Their bodies are silver-gray with a subtle crosshatch pattern and bright yellow edges on the dorsal, anal, and tail fins.
Females, while lacking the vibrant blue throat, still exhibit elegant silver coloration with yellow fin accents, making them an attractive addition to larger marine aquariums.
Natural Habitat and Behaviour
Native to the Indo-Pacific region, Xanthichthys auromarginatus inhabits deep reefs and outer reef slopes at depths of 20 to 100 meters (65 to 330 feet). Unlike more aggressive, benthic-dwelling triggerfish, the Blue Throat Triggerfish is a mid-water swimmer, preferring to stay in the open water column rather than foraging along the substrate.
This species is one of the most peaceful triggerfish, making it an excellent choice for large community reef tanks. It is not highly territorial, though males may display increased coloration and mild aggression during spawning.
Tank Requirements and Water Parameters
• Minimum Tank Size: 130 gallons (500 liters) for juveniles, 200+ gallons (750+ liters) for adults
• Water Parameters:
• Temperature: 24°C – 27°C (75°F – 81°F)
• pH: 8.1 – 8.4
• Specific Gravity: 1.020 – 1.025
• Aquascaping:
• Open swimming areas are essential, as this species prefers to swim in the mid-water column.
• Caves and ledges should be provided for resting and hiding.
• Stable rockwork is recommended, though this species is less likely to move objects than other triggers.
• Lighting: Moderate; deep-water fish may take time to adjust to intense reef lighting.
• Water Movement: Moderate to strong, mimicking deep-reef currents.
Diet and Feeding
Unlike most triggerfish, the Blue Throat Triggerfish is primarily a planktivore, meaning it does not actively hunt crustaceans on the reef. This makes it one of the most reef-compatible triggerfish.
• Natural Diet: Zooplankton, small crustaceans, and floating invertebrates.
• Captive Diet:
• Mysis and brine shrimp.
• Chopped seafood (shrimp, squid, clams).
• High-quality marine pellets and flakes.
• Occasional algae-based foods to ensure a balanced diet.
Feeding Frequency: 1-2 times per day to maintain energy levels and coloration.
Compatibility and Social Structure
Temperament:
• One of the most peaceful triggerfish, making it a great choice for large community tanks.
• Does not display territorial aggression like most trigger species.
• Tank Mates:
Compatible with other large, peaceful fish, such as:
• Tangs
• Large angelfish
• Butterflyfish
• Wrasses
• Can be kept in pairs (male and female) in very large tanks (300+ gallons).
• Avoid highly aggressive triggers, which may stress them.
Reef Compatibility:
✅ One of the few truly reef-safe triggerfish—does not damage corals but may eat small shrimp.
Important Considerations
• One of the Best Triggers for Reefs: Unlike most triggerfish, this species does not harm corals, making it one of the few true reef-safe triggers.
• May Be Shy at First: It can take time to adjust to brighter lighting and active tank mates.
• Prefers Open Water: This species prefers mid-water swimming, so ensure plenty of open space in the aquarium.
• Less Likely to Rearrange Rockwork: Unlike more aggressive triggers, the Blue Throat does not typically dig or move objects.