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FishbeginnerSaltwater

Blue-throat Triggerfish

Xanthichthys auromarginatus

AnimaliaChordataActinopterygiiTetraodontiformesBalistidae

📍 Indo-Pacific

Ask Finn

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.

Size12"
Min Tank75g
semi-aggressive
Zonemid

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.

Common Diseases

Ich (Cryptocaryon irritans)

Symptoms

White spots on body and fins, rapid breathing, flashing against rocks, lethargy

Treatment

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)

Symptoms

Fine white or gold dust coating on body, rapid breathing, loss of appetite, scratching behavior

Treatment

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

Symptoms

Torn fins, open sores, cloudy eyes, lethargy, loss of appetite

Treatment

Maintain excellent water quality with frequent changes, use antibiotic medications if severe, ensure adequate nutrition and low stress environment

Parasitic Copepods

Symptoms

Visible small crustaceans on body, scratching, irritation, potential fin damage

Treatment

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

Stats

Community tips0
Kept by0 hobbyists