Acanthurus lineatus is a marine surgeonfish known as the lined surgeonfish, recognized for its vivid blue and yellow horizontal striping, laterally compressed body, and active territorial behavior around shallow reef flats and rocky surge zones. In the wild, it grazes on algae growing over reef surfaces while defending feeding areas and moving through wave-swept habitats with powerful, continuous swimming, giving it both striking beauty and a strong ecological presence. In aquarium care, Acanthurus lineatus is admired for its bold pattern and algae-grazing behavior, but it requires a very spacious, mature marine system with stable water quality, strong oxygenation, abundant vegetable-based foods, and careful attention to aggression, stress, and common tang health problems such as marine ich.
