Desjardin's sailfin tang
Zebrasoma desjardinii
A majestic marine surgeonfish from the Indian Ocean, famous for its spectacular sail-like fins and striped pattern. Requires very large tanks and constant grazing opportunities.
Water Temperature
24 - 28 °C
pH Value
8.1 - 8.4
Water type
Marine
Tank level
All levels
Adult size
40 cm
Minimum tank volume
>= 600 L
Minimum group
>= 1
KH
8 - 12 dKH
Species description
Geographical Origin and Habitat: Widely distributed in the tropical Indian Ocean, including the Red Sea, South Africa, and the Mascarene Islands. Inhabits silty inner reefs, protected lagoons, and seaward reef slopes with abundant algal growth down to 30 meters.
Taxonomy and Morphology: Belongs to the family Acanthuridae, genus Zebrasoma. Characterized by a high, laterally compressed body, pointed snout, and exceptionally large, fan-like dorsal and anal fins. Features a sharp caudal spine on each side of the caudal peduncle.
Social Behavior: Territorial and active species. Juveniles are solitary and hide among corals, while adults form pairs or small groups. In captivity, it displays strong intraspecific aggression and hostility toward other surgeonfish, especially if introduced later.
Coloration and Sexual Dimorphism: The body pattern consists of alternating gray, brown, and yellow vertical bands covered in numerous small light blue and golden spots extending to the snout and fins. No obvious external sexual dimorphism exists, though adult males are slightly larger.
Care, breeding and tankmates
Aquarium Setup: Demands large marine aquariums, starting from 500 liters (130 gallons) for adult specimens, as they can grow up to 40 cm. Setup must include plenty of live rock arranged to create caves and swim-throughs, leaving ample open space for swimming.
Diet and Feeding: Primarily herbivorous diet. In the aquarium, it must be fed nori seaweed, spirulina, blanched vegetables (spinach, zucchini), and specific marine herbivore foods. Supplement occasionally with meaty foods like mysis and brine shrimp.
Water Quality: Demands excellent filtration (efficient protein skimmer) and strong water movement to ensure high oxygenation. Parameters: salinity 1.020-1.025, pH 8.1-8.4, temperature 24-28°C. Nitrates should be kept as close to zero as possible.
Compatibility and Cohabitation: Compatible with most reef fish and invertebrates (reef-safe). Avoid housing with other Zebrasoma or similarly shaped acanthurids unless the tank is exceptionally large. Should be the last fish introduced.
Aquarium Breeding: Extremely complex and not successfully documented in home aquariums. In the wild, they are pelagic spawners, releasing eggs and sperm into the water column during group spawning events synchronized with lunar phases.
Risks and Diseases: Highly susceptible to skin parasites such as Marine Velvet (Oodinium) and Marine Ich (Cryptocaryon irritans). A UV sterilizer is highly recommended. Can suffer from Head and Lateral Line Erosion (HLLE) if the diet lacks vitamins.
Geographic Origin and Distribution
Widely distributed in the tropical Indian Ocean, including the Red Sea, South Africa, and the Mascarene Islands. Inhabits silty inner reefs, protected lagoons, and seaward reef slopes with abundant algal growth down to 30 meters.
Origin
Tropical oceans and reefsAfrica and MadagascarSouth and Southeast Asia
Fish profile
- Temperament
- Territorial
- They exhibit an energetic and bold temperament, often becoming the centerpiece and one of the most active fish in the marine aquarium. While generally peaceful toward non-competitors, they are fiercely territorial over their grazing areas against other surgeonfish. They possess a sharp, scalpel-like spine at the base of their tail which they use to defend themselves or assert dominance. With adequate space and a proper diet, they become confident, hardy, and engaging pets that quickly learn to recognize their owners.
- Diet
- Herbivore
- They are quintessential herbivores that require a diet overwhelmingly focused on marine algae and vegetable matter to maintain optimal health. While they will eat meaty frozen foods, their primary diet should consist of high-quality dried seaweed (nori), spirulina flakes, and algae-based pellets. Grazing naturally on live rock throughout the day provides both nutrition and essential behavioral enrichment. Insufficient vegetable matter in their diet can lead to malnutrition, faded coloration, and conditions like Head and Lateral Line Erosion (HLLE).
- Life expectancy
- 10-15 years
- This majestic species can live between 10 and 15 years in captivity when kept under optimal conditions, although in the wild its lifespan can exceed 20 years. To ensure its longevity, it is essential to house it in a very spacious aquarium with excellent filtration and provide a diet rich in vegetable matter. Targeted stress management and proper parasite prophylaxis significantly increase the chances of long-term success.
- Adult size
- 40 cm
- The catalog's scalar value is 40 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 40 cm for this species, recorded as total length (TL). The taxonomic record consulted is Zebrasoma desjardinii (v25.04); male or unsexed record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Solitary
- Sexing these fish visually is extremely difficult, as there are no obvious external differences between males and females. In the home aquarium, they are almost exclusively kept as solitary individuals to avoid severe territorial disputes. Keeping multiple individuals requires an exceptionally large tank (hundreds of gallons) to allow them to establish distinct territories. Unless one has a massive public-style aquarium, keeping a single specimen is the only reliable way to ensure harmony.
- Feeding frequency
- 3-4 times daily
- Because they are constant grazers in the wild, they should be fed multiple times a day to satisfy their high metabolic rate. Offering dried seaweed on a vegetable clip should be a daily routine, allowing them to graze naturally over several hours. Supplement this with small offerings of prepared foods or frozen mysis and brine shrimp two to three times daily. Ensuring they always have access to algae prevents aggression driven by hunger and keeps their immune system strong.
- Bioload
- This tang produces a significant bioload due to its large adult size and constant grazing habits. They excrete a large volume of waste, necessitating a highly efficient protein skimmer and robust biological filtration in the marine system. Regular, substantial water changes and the use of chemical filtration media like GFO and activated carbon are essential to keep nutrient levels low. Maintaining pristine water quality is critical, as they are susceptible to diseases like marine ich if stressed by poor conditions.
- Flow
- Strong
- They originate from reef environments with strong, dynamic water movement and require similar conditions in captivity. High water flow provides necessary oxygenation and allows them to utilize their powerful swimming abilities. Wavemakers and powerheads should be positioned to create turbulent flow across the reef structure, mimicking the surge zones they inhabit naturally. Adequate flow also helps keep detritus suspended so the mechanical filtration can remove it efficiently.
- Jump risk
- No
- Reproduction
- Egg scatterer
- They are pelagic spawners, releasing their gametes into the water column during synchronized mass spawning events in the open ocean. Captive breeding in standard home aquariums is exceptionally rare and virtually impossible due to the spatial requirements for their spawning ascent. The microscopic larvae undergo a complex pelagic phase before settling onto the reef, requiring specialized commercial aquaculture facilities to rear successfully. Consequently, most specimens available are either wild-caught or commercially bred by large-scale institutions.
- Compatibility & tankmates
- Peaceful
- They are generally peaceful toward dissimilar species but can be highly territorial and aggressive toward other tangs, particularly those of the same genus or body shape. They do well in large community reef tanks with a variety of wrasses, clownfish, anthias, and peaceful angels. To minimize aggression, they should be introduced to the aquarium as the last fish or introduced simultaneously with other tangs. They are entirely reef safe, as they focus their grazing on algae rather than corals or sessile invertebrates.
- Tank level
- All levels
- They are active, open-water swimmers that utilize every level of the aquarium, from the bottom substrate to the water's surface. They spend the vast majority of their time navigating the rockwork, constantly picking and grazing at algae in the middle and lower zones. However, they need significant unobstructed horizontal space to swim rapidly across the upper levels of the tank. A mature tank with intricate rock structures combined with open swimming lanes is essential for their well-being.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Resilience
- Medium (1.4 - 4.4 years)
- Phylogenetic uniqueness (PD50)
- 0.5078
- Bayesian Length-Weight
- a = 0.02291, b = 2.96
- VulnerabilityLow to moderate vulnerability (30 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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