
Acanthurus guttatus
Family: Acanthuridae ยท Tangs & Surgeonfish
Also known as: Whitespotted Tang, Mustard Surgeonfish, Spotted Surgeonfish
The Whitespotted Surgeonfish is a robust and attractively patterned tang characterized by its dark brown to charcoal body adorned with prominent white spots concentrated on the posterior half. Three broad white vertical bars on the forward body add to its distinctive appearance, making this one of the more uniquely patterned surgeonfish in the hobby.
In the wild, Whitespotted Surgeonfish are typically found in surge zones and shallow, wave-washed reef crests at depths of 1 to 15 meters. They are adapted to high-energy environments and are strong swimmers that thrive in turbulent waters. Their diet consists primarily of filamentous algae, which they graze continuously from reef surfaces in these shallow, sun-lit areas.
In captivity, the Whitespotted Surgeonfish requires a minimum of 125 gallons with strong water flow to simulate its natural surge-zone habitat. At around 10 inches maximum size, it is a manageable tang for medium-to-large aquariums. This species is hardy once established but can be shy initially and requires patience during acclimation. Like all tangs, it benefits from a diet rich in marine algae to prevent HLLE.
A dedicated herbivore that feeds on filamentous algae in wave-washed reef zones. In captivity, offer dried nori seaweed sheets daily, Spirulina-enriched pellets, and frozen herbivore preparations. Strong emphasis on marine algae is critical for health and coloration.
The Whitespotted Surgeonfish is semi-aggressive toward other Acanthurus tangs but generally compatible with dissimilar species. Works well with clownfish, wrasses, angelfish, and other community reef fish. Completely reef-safe and an effective algae grazer.
Check CompatibilityWhitespotted Surgeonfish are pelagic spawners that have not been bred in home aquariums. Their extended larval phase and surge-zone habitat requirements make captive propagation extremely challenging. All specimens are wild-caught.