Acanthurus polyzona, commonly known as the black-barred surgeonfish[3] or zebra tang,[4] is a tropical fish found in coral reefs in the western Indian Ocean.

[2] Acanthurus polyzona is a laterally flattened fish, roughly the shape of an almond, and can grow to a length of about 20 cm (8 in).

[6] The only fish with which it is likely to be confused is the "convict tang" (Acanthurus triostegus); that species has a yellower background colour and just six vertical, rather more slender black bands.

[6] Acanthurus polyzona has a rather restricted distribution in the tropical western Indian Ocean, its range including Madagascar, Mauritius, Réunion and the Comoro Islands.

[6] The juveniles, which are similar to the adults in markings but rather more elongated, associate with young convict tangs.