Blue Throat Triggerfish - Male - Xanthichthys auromarginatus

Male / ML (3.75-4.5")

$149.99

Blue Throat Triggerfish - Male - Xanthichthys auromarginatus

$149.99

Goes well with:

Xanthichthys auromarginatus

Care Level Moderate

Temperament Semi-Aggressive

Reef Safe With Caution

Max Size 10 inches

Tank Size 125 gallons

Diet Carnivore

Common Name Blue Jaw Triggerfish

Origin Hawaii

Food

Mysis Shrimp Finely Chopped Seafood Shellfish

Tags

Triggerfish Reef Safe With Caution Carnivore

Diet & Feeding

Blue Jaw Triggerfish are omnivorous, requiring a varied diet to maintain optimal health. Their diet should include a mix of meaty foods such as shrimp, squid, and krill, along with high-quality marine pellets and flakes. It's beneficial to supplement their diet with algae or spirulina to mimic their natural feeding habits. Feeding should occur 2-3 times daily in small amounts to prevent overfeeding and maintain water quality. Regularly varying their diet ensures they receive all necessary nutrients.

Behavior

Blue Jaw Triggerfish are active swimmers, often exploring mid to bottom levels of the water column. They are social but can be territorial, especially during breeding. Males exhibit vibrant colors to assert dominance and attract mates. Generally peaceful, they coexist well with similarly sized, non-aggressive species but may display aggression towards smaller, shy fish. They thrive in environments with ample space and hiding spots, which help mitigate territorial disputes and reduce stress.

FAQs

How can I reliably distinguish a male Blue Jaw Triggerfish from a female, and does sex matter for aquarium behavior and coloration over time?

Males have a bright blue “jaw” (lower face), yellow edging on the dorsal and anal fins, and often a more intense blue-gray body with faint vertical bars; females are usually duller gray with a less vivid or absent blue chin and minimal yellow fin trim. In captivity, some females can develop partial male coloration if no dominant male is present, but full sex transition in this species is debated and not consistently observed. Sex matters behaviorally: males tend to be slightly more territorial and bolder, especially as they mature, while females are often more reserved. If your goal is a calm semi-reef community and subtle color is acceptable, a single female can be an excellent choice; if you want the brightest colors, a single male or one male with one female (in a large tank) is ideal.

What minimum tank size and aquascape layout specifically suit an adult Blue Jaw Triggerfish, and how should rockwork be arranged to reduce stress and aggression?

A single adult Blue Jaw Triggerfish does best in at least a 125-gallon (475 L) tank; 180 gallons (680 L) or more is recommended for especially active individuals or for keeping with other sizable fish. They like open horizontal swimming space plus multiple cave-like retreats. Build rockwork as solid, stable “buttresses” rather than narrow towers, since triggers often wedge themselves into crevices at night and can topple loose rocks. Create at least two or three cave systems with different entrances so the fish can retreat without getting cornered by tankmates. Leave a clear “racetrack” of open water around the rock islands to allow continuous swimming and to reduce territorial bottlenecks. Avoid sharp overhangs pointing upward where the trigger might scrape its forehead while darting into hiding.

How can I keep a Blue Jaw Triggerfish well-fed without overloading the tank with nutrients, and what are ideal food types and feeding patterns for long-term health?

Blue Jaws are hearty eaters and need a varied, meaty diet but are less destructive than many triggers. Ideal staples include: high-quality marine pellets (medium to large size), frozen mysis shrimp, chopped squid, clam, shrimp, krill, and occasional whole shell-on foods (like small clams or mussels) to work their teeth and jaw muscles. Feed small portions 2–3 times per day rather than one large meal. Aim for what it can fully consume in 30–60 seconds, watch for spit-out fragments, and siphon uneaten chunks after feeding if possible. To manage nutrients, use strong mechanical filtration (filter socks, roller mat), a good skimmer, and consider feeding with pumps temporarily off so food doesn’t disperse into rockwork. You can also alternate heavier meaty meals with lighter pellet feedings, and schedule the heaviest feeding just before or during your skimmer’s most active period.

Are Blue Jaw Triggerfish truly “reef safe,” and which specific invertebrates or corals are most at risk versus generally safe in a mixed reef tank?

Blue Jaw Triggerfish are among the more coral-safe triggers, but “reef safe” is not guaranteed. They typically ignore corals themselves, so SPS, LPS, and soft corals are usually fine. The main risk is mobile invertebrates. They often prey on or at least pick at: small snails, small hermit crabs, ornamental shrimp (especially cleaner shrimp and sexy shrimp), and tiny crabs. Larger, well-armored inverts (large turbo snails, big hermits) have better odds but are not completely safe. Clams may be at risk if the fish learns to nip the mantle, though some keepers report success with large Tridacna in big tanks. If you want to maximize safety, avoid delicate ornamental shrimp and very small crabs, expect to replenish clean-up crew periodically, and introduce the Blue Jaw after corals are established so it is less likely to experiment with nipping tissue out of boredom.

My new Blue Jaw Triggerfish is hiding constantly and refuses food for several days after introduction. What species-specific acclimation steps can I take to help it settle and start eating?

Blue Jaws are more timid than many triggers and often react to new surroundings by hiding and fasting. To help: 1) Dim lights for the first few days, or reduce the photoperiod; bright lights can intimidate them. 2) Provide ample caves and overhangs, ideally including one that faces a quieter side of the tank. 3) Use a social acclimation box (for 3–7 days) if there are assertive tankmates; this lets the trigger see others without being chased. 4) Start with very enticing foods like thawed mysis, enriched brine shrimp, or small bits of fresh clam or shrimp on a feeding stick right near its chosen cave. 5) Keep human movement slow and avoid tapping the glass or sudden approach. 6) Check that temperature, salinity, and pH closely match the water it came from to minimize physiological stress. Many Blue Jaws will not eat for 3–7 days after introduction; as long as breathing is steady, fins are not clamped tightly, and there are no visible parasites, this is usually normal. Once it takes the first few bites, gradually transition to your regular varied diet and normal lighting over a week.

You will receive a fish SIMILAR in design and size to the fish in the photo. This is NOT a WYSIWYG fish.

Blue Throat Triggerfish (Xanthichthys auromarginatus)

The Blue Throat Triggerfish is a striking, reef-associated species admired for its calm demeanor and vibrant coloration. Males feature a vivid blue jaw and yellow-edged fins, while females display subtler hues of silver and blue. Found across the Indo-Pacific, this triggerfish inhabits deep reef slopes and open-water environments, bringing both color and personality to larger aquariums.

Tank Requirements
A minimum of 125 gallons is recommended to accommodate their active swimming habits. Provide abundant open space for cruising along with stable rock structures for resting and security. Good filtration, moderate-to-strong flow, and a secure lid are essential, as triggers are powerful jumpers.

Color, Personality, and Hardiness
Unlike many triggerfish, the Blue Jaw is mild-mannered and well-suited for community reef tanks. Males are particularly colorful and confident, while females tend to be more reserved. They are highly intelligent, responsive to their keepers, and among the hardier trigger species when acclimated properly.

Diet and Feeding
Omnivorous by nature, they thrive on a balanced diet of meaty fare such as shrimp, squid, clams, krill, and high-quality pellets formulated for marine carnivores. Provide variety to maintain their bright coloration and dental health. Feeding two to three times daily is ideal.

Tankmates and Behavior
Generally peaceful toward other species, Blue Jaw Triggerfish can coexist with tangs, angelfish, and larger wrasses. Avoid small ornamental shrimp, as they may be consumed. Their outgoing and interactive personalities make them excellent centerpiece fish for larger reef systems.

Tags: Reef Safe Caution Trigger