Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Acanthurus polyzona is a tropical fish found in coral reefs situated in the western Indian Ocean. It was first named by Pieter Bleeker in 1868, and is commonly known as the Black-barred surgeonfish. Acanthuridae ("thorn tail") is the family of surgeonfishes, tangs, and unicornfishes. The family includes about 80 species in six genera, all of which are marine fish living in tropical seas, usually around coral reefs. Many of the species are brightly colored and popular for aquaria. The distinctive characteristic of the family is the spines, one or more on either side of the tail, which are dangerously sharp. The dorsal, anal and caudal fins are large, extending for most of the length of the body. The small mouths have a single row of teeth used for grazing on algae.

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