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Zebrasoma rostratum, commonly known as the Black tang, is a species of surgeonfish belonging to the family Acanthuridae. Here are some key characteristics and information about this striking marine fish:

1. Appearance: The Black tang has a distinctive appearance with a sleek, elongated body and a striking coloration. Its body is primarily black, which is accentuated by a bright yellow or white dorsal fin and tail fin. Juveniles may have additional markings that fade as they mature.
2. Distribution: This species is native to the Indo-Pacific region, specifically found in the waters around islands and reefs of the central Pacific, including Hawaii and Johnston Atoll.
3. Habitat: Black tangs inhabit clear, shallow waters on coral reefs and reef slopes. They prefer areas with abundant coral growth and often swim in small groups or solitary.
4. Behavior: Like other surgeonfish, Zebrasoma rostratum feeds primarily on algae and detritus, using its specialized mouth and teeth to graze on reef surfaces. They play a role in controlling algae growth and maintaining reef health.
5. Aquarium Care: The Black tang is highly valued in the aquarium trade due to its striking appearance. However, it requires a large aquarium with plenty of swimming space and hiding spots. It is important to provide a diet rich in marine algae and vegetables to maintain its health in captivity.