Dussumier Tang (Acanthurus Dussumieri) saltwater aquarium fish portrait

Acanthurus dussumieri is a deep-bodied, laterally compressed surgeonfish built for open-water cruising and constant grazing. The body ranges from pale brown to orange-tan or yellow-brown and carries irregular wavy blue lines across the flanks, with a conspicuous orange to yellow band running between the eyes. Fins are edged in yellow, the tail is marked with blue spots, and a sharp white erectile spine sits on each side of the caudal peduncle. The species ranges widely across the tropical Indo-Pacific, from East Africa to Hawaii and the Line Islands, north to southern Japan and south to Australia and Lord Howe Island. Aquarium specimens commonly reach around 10 inches.

Housing should reflect the swimming demands of a large Acanthurus. A 125-gallon aquarium is the practical minimum, and longer footprints are strongly preferred; several aquarium references push recommendations far higher, into the several-hundred-gallon range, which reflects how much horizontal distance this fish will use. Arrange rockwork to create grazing surfaces, sheltered refuges, and visual breaks that separate territories, while leaving broad open lanes for continuous laps. Strong, turbulent, well-oxygenated circulation suits its reef-slope origins, and stable, clean water is essential for long-term condition. Care requirements place this fish at a moderate level, so the system should be mature and steady before it is introduced.

On the reef, this tang works the surface film that coats sand and rock, taking fine green and blue-green algae, diatoms, and detritus in near-continuous grazing bouts. That feeding pattern should guide captive nutrition. Build the diet around marine algae and vegetable matter, including dried nori, macroalgae, Spirulina, and enriched herbivore flakes or pellets. Some aquarium references also suggest occasional frozen or meaty marine foods as a supplement, but algae-based items should remain the foundation.

Offer two or three feedings each day, and keep grazing material available between meals so the fish is rarely without something to pick at. Constant access to algae supports better color, steadier weight, and less interest in picking at the reef itself. During acclimation and quarantine, confirm that the fish is feeding confidently on an algae-rich diet before it is moved into the display aquarium.

Dried Nori Macroalgae Spirulina Herbivore Flakes Herbivore Pellets Frozen Marine Foods
This is an active, largely diurnal grazer that patrols tirelessly through open water and along rock faces. In the wild it occurs alone or in loose groups, but aquarium practice favors one specimen per system. It can be territorial toward other surgeonfish, and aggression is most likely with similar-shaped tangs and other members of Acanthurus. Behavior is usually far more measured around dissimilar community fishes, though cramped quarters sharpen its semi-aggressive streak. Handle it with care, since the caudal-peduncle spine is genuinely sharp and can catch nets and fingers alike.

Choose tankmates that will neither nip fins nor compete for the same grazing territory, and introduce any additional tangs only in a very large aquarium with abundant structure. The species is consistently regarded as coral-safe and appropriate for reef displays, and it generally leaves invertebrates alone. One caution deserves attention: an underfed individual may begin picking at small mobile or sessile invertebrates, so treat generous algae feeding as part of reef protection rather than assuming the reef-safe label covers every situation.

FAQ

Frequently Asked Questions

About the Dussumier Tang

  • How large an aquarium does a Dussumier Tang need?
    A 125-gallon aquarium is the working minimum, though several aquarium references recommend substantially larger systems. Favor a long tank with wide open swimming lanes, since this fish cruises constantly.
  • What should a Dussumier Tang be fed, and how often?
    Base the diet on marine algae, dried nori, Spirulina, macroalgae, and other herbivore preparations, with occasional frozen or meaty marine foods as a supplement. Feed two or three times daily and leave grazing material available in between.
  • Can it be kept in a reef tank or with other tangs?
    It is regarded as coral-safe and suitable for reef aquariums, although a poorly fed individual may pick at small mobile or sessile invertebrates. One specimen per tank is the safest arrangement, and mixing it with similar-shaped surgeonfish requires a very large aquarium.