Bariene Tang - Acanthurus bariene

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$129.99

Reef Safe Tang

$129.99

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Goes well with:

Diet

algae/nori spirulina mysis brine shrimp

Min Tank Size 350 gallons

Temperament Semi-aggressive

Reef Safe Yes

Care & Diet Feeding, nutrition, and best practices.

Diet Type: Omnivore

Diet and Feeding: The Bariene Tang is primarily an herbivore, grazing continuously in the wild on marine algae, filamentous seaweed, and associated plant matter, with small amounts of detritus and incidental meaty foods; in captivity, it is beneficial to make marine algae the bulk of the diet, especially nori/seaweed sheets, spirulina-based flakes, algae pellets, and other high-quality herbivore formulas. To ensure balanced nutrition, supplement regularly with modest portions of mysis shrimp, enriched brine shrimp, chopped clam, and other finely prepared seafoods as occasional treats rather than staples. Offer seaweed on a clip or feeding station to encourage natural foraging, and provide small feedings multiple times daily instead of one large meal. It is important to avoid overfeeding, as this can compromise water quality and reduce grazing behavior.

algae/nori spirulina mysis brine shrimp

Behavior Temperament, activity level, and interactions.

Temperament: Semi-aggressive

Bariene Tangs are highly active, nonstop swimmers that need a long, open aquarium with plenty of room to cruise and retreat into rockwork when stressed. They are generally semi-aggressive and territorial, with conspecifics often sparring unless introduced together in a very spacious system. A minimum tank size of 350 gallons is recommended, though larger systems are strongly preferred, and a layout with visual barriers and structured live rock helps reduce aggression and establish calmer territories. In reef systems they are usually reef-safe and can coexist well with many other fish, but best kept with robust, similarly sized tank mates rather than passive species or other tangs in cramped quarters. Their diet is primarily herbivorous, centered on filamentous algae and marine vegetable matter, though they also benefit from supplemental meaty foods and prepared herbivore blends. Frequent feedings of nori, algae-based pellets, and frozen fare support both health and grazing behavior.

Tank & Aquascape Tank requirements and aquascaping tips.

Min Tank Size: 350 gallons
Max Size: 20 inches
Care Level: Moderate
Origin: Indo-Pacific

Compatibility Tank mates, aggression, and introduction order.

Temperament: Semi-aggressive
Reef Safe: Yes

Reef & Health Reef safety, common issues, and prevention.

Reef Safe: Yes
Care Level: Moderate

FAQs Answers to the most common questions.

How can I tell a Bariene Tang (Acanthurus bariene) apart from a Naso tang or other brown surgeonfish at the store?

The Bariene Tang has a more streamlined, oval surgeonfish body with a long continuous dorsal and anal fin, a distinctly yellowish-brown to olive-brown coloration, and a pale ring around the eye on many individuals. Unlike Naso tangs, it does not develop the prominent horn or elongated streamers, and it has a more “flat-sided” surgeonfish profile. Juveniles are often more subdued and can be confused with other brown Acanthurus species, so look for the overall body shape and the sharp caudal scalpel near the tail base, which is typical of surgeonfish.

What tank size and layout does a Bariene Tang really need long term?

This is a large, active open-water grazer that should be kept in a very large system, ideally 8 feet long or more, with 350 gallons minimum and larger being much better. It needs long swimming lanes, strong circulation, and plenty of open space rather than a rock-choked aquascape. Rockwork should be arranged to create caves and turning points, not fill the tank. Because it is constantly on the move and can become stressed in cramped quarters, undersizing is one of the biggest reasons Bariene Tangs fail in captivity.

Will a Bariene Tang eat enough algae in a reef tank to help control nuisance growth?

It will graze constantly, but it should not be thought of as a true nuisance-algae solution. Bariene Tangs primarily browse on microalgae, film algae, and some detrital material on rock and hard surfaces. They may pick at certain nuisance algae, but they are not reliable for eradicating hair algae or tougher macroalgae outbreaks. In captivity, they still need regular feedings of marine algae-based foods, nori, and a varied herbivorous omnivore diet to stay healthy and maintain color.

Is a Bariene Tang aggressive toward other tangs, especially similar body-shaped species?

Yes, it can be quite territorial, especially toward other surgeonfish with similar body shape, color, or grazing behavior. It is usually best introduced last in a community and kept with ample space and multiple feeding stations. Aggression rises sharply in smaller tanks or when added with other Acanthurus species. In a large system, mixing with dissimilar tankmates is easier, but caution is still needed because tang-to-tang disputes can become severe and persistent.

What are the most common health problems in Bariene Tangs, and how do I prevent them?

The biggest issues are stress-related immune suppression, marine ich, skin flukes, and head/lateral line erosion if nutrition or water quality is poor. They often arrive thin and stressed from collection and shipping, so quarantine is strongly recommended. Feed a varied diet rich in marine algae, maintain excellent oxygenation, stable salinity, and pristine water quality, and avoid overcrowding. Because they are sensitive to stress and poor handling, prevention is far more important than treatment once symptoms appear.

Bariene Tang – Acanthurus bariene

The Bariene Tang, also known as the Blackspot Surgeonfish or Eyespot Surgeonfish, is an impressive saltwater fish distinguished by its deep gray-brown body, delicate horizontal patterning, warm yellow-to-orange dorsal and anal fins, and vivid blue fin edging. A prominent dark spot behind the eye gives the species its alternate common names, while pale lips and a crescent-shaped tail complete its refined adult coloration.

Native to the Indo-West Pacific, Acanthurus bariene inhabits clear coastal reef slopes and outer reef walls. Adults are most often encountered on deeper reef faces, while juveniles use shallower protected areas around soft corals. In the wild, this active surgeonfish occurs singly or in pairs and grazes algal film from exposed rock surfaces.

Reaching approximately 20 inches, the Bariene Tang requires considerably more room than most commonly kept tangs. Its substantial adult size, powerful swimming ability, and commanding presence make it an exceptional centerpiece for a very large reef aquarium or fish-only aquarium. Long-term success depends on expansive swimming space, strong water movement, generous vegetable-based feeding, and carefully selected tankmates.

Quick Care Guide

Care Level: Moderate
Minimum Tank Size: 350 gallons
Temperament: Semi-aggressive
Diet: Herbivore
Reef Safe: Yes
Region: Indo-West Pacific
Scientific Name: Acanthurus bariene

Tank Requirements

Provide a mature aquarium with an eight-foot or longer swimming footprint, substantial water volume, and wide, uninterrupted swimming lanes. Rockwork should be positioned mainly along the back and sides of the aquarium, creating caves, overhangs, and nighttime retreats without filling the central swimming area.

Strong, varied water movement and excellent oxygenation are important for this active reef-slope species. Use oversized biological filtration and efficient protein skimming to manage the waste produced by a large fish receiving frequent meals. Stable water quality is essential, and this tang should not be introduced to a newly established system.

A sand or fine-gravel substrate is suitable, although no specialized substrate is required. Secure the rockwork carefully and provide enough room for the fish to turn comfortably at its adult size. A fitted aquarium cover is advisable, particularly during acclimation or territorial disputes.

Diet and Feeding

The Bariene Tang is primarily herbivorous and naturally grazes algal film from bare reef rock. In captivity, marine algae should remain the foundation of its diet rather than relying exclusively on general-purpose pellets or meaty frozen foods.

Offer nori or other marine algae sheets daily, along with spirulina flakes, high-quality herbivore pellets, frozen algae blends, and foods formulated for surgeonfish. Natural algae growth on mature live rock provides valuable additional grazing opportunities. Small portions of mysis shrimp, enriched brine shrimp, krill, or mixed marine frozen foods may be included for variety, but they should not replace algae-rich foods.

Feed two to three small meals daily and make grazing material available regularly. Multiple algae clips can help reduce competition when this fish is housed with rabbitfish or other large herbivores.

Temperament and Tankmates

This species is generally manageable with unrelated marine fish but may become territorial toward other tangs, particularly members of the genus Acanthurus or fish with a similar body shape. Its aggression may increase as it grows and establishes ownership of the aquarium.

Suitable tankmates include large angelfish, rabbitfish, robust wrasses, butterflyfish, triggers with appropriate temperaments, and other medium-to-large marine fish capable of competing at feeding time. Avoid timid species that may be intimidated by its size and constant movement.

Keep one Bariene Tang in most aquariums. Combining it with additional surgeonfish should only be attempted in an exceptionally large system with separate territories, abundant food, and a carefully planned introduction order. Introduce this tang after more peaceful community fish whenever possible.

Like all surgeonfish, it possesses sharp defensive spines on the caudal peduncle. Avoid handling it directly and use appropriate containers rather than standard fine-mesh nets during transfers.

Reef Compatibility

The Bariene Tang is considered reef safe and does not normally prey on corals, ornamental shrimp, crabs, snails, clams, or other desirable reef invertebrates. Its continuous grazing can help control algal films on exposed rockwork.

It may consume decorative macroalgae and can accidentally brush against or dislodge loosely mounted coral fragments because of its adult size. Secure frags and leave adequate clearance between large coral colonies and primary swimming routes.

Water Parameters

Temperature: 75–80°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH

Maintain excellent oxygenation, consistent salinity, and low levels of accumulated organic waste. Long-term stability is more important than repeatedly adjusting the aquarium to reach a single exact reading.

Common Considerations

Very large adult size: This species can reach approximately 20 inches and is unsuitable for the average home aquarium.
Requires a long aquarium: Water volume alone is not enough; extensive horizontal swimming space is essential.
Use caution with other tangs: Territorial aggression is most likely toward other Acanthurus species and similarly shaped surgeonfish.
Provide algae every day: Frequent access to marine algae supports body condition and natural grazing behavior.
Handle carefully: The sharp caudal-peduncle spines can cause significant cuts during capture or transfer.