Desjardin's sailfin tang

Geographical Origin and Habitat: Widely distributed in the Indian Ocean, from East Africa and the Red Sea to Sri Lanka and western Indonesia. Found in sheltered coral reefs and deep lagoons.

Taxonomy and Morphology: Belongs to the Acanthuridae family. Closely resembles Z. veliferum but is distinguished by more intricate freckles and lighter tail spots. Grows up to 40 cm (16 inches).

Social Behavior: Bold and territorial. Established adults will fiercely defend their feeding territories, especially against other herbivores in the tank.

Coloration and Sexual Dimorphism: Features alternating dark and light vertical bands, covered in fine yellow lines and golden freckles on the face and lower body. No visible sexual dimorphism.

Aquarium Setup: Demands a massive tank of at least 600 liters (150 gallons) with plenty of open swimming space and heavy rockwork for hiding and algae grazing.

Diet and Feeding: Heavily herbivorous. Provide constant access to dried nori sheets, spirulina-based pellets, flakes, and macroalgae. Supplement with occasional frozen mysis.

Water Quality: Requires clean, highly oxygenated water with strong currents. Keep temperature at 24-28°C (75-82°F), pH 8.1-8.4, specific gravity 1.020-1.025, and KH 8-12.

Compatibility and Cohabitation: Highly aggressive towards other Zebrasoma species. Best kept as the sole tang or alongside tangs of different genera in very large systems. Reef safe.

Aquarium Breeding: Unreported in domestic setups. Spawns openly in water columns, producing pelagic eggs that drift in offshore currents, making rearing impossible at home.

Risks and Diseases: Prone to Cryptocaryon irritans and Lateral Line Erosion (HLLE). High-quality herbivorous nutrition and stable water quality are vital preventive measures.