Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Ringtail surgeonfish (Acanthurus blochii) is a marine reef tang in the fish family Acanthuridae. The fish grow to a maximum length of 45 cm (18 in). 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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