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Acanthuridae is the family of surgeonfishes , tangs , and unicornfishes .. family. family ( biology ). unicornfishes. Naso ( genus ). The family includes about 86 extant species .. family. family ( biology ). The family is composed of marine fish living in tropical seas , usually around coral reefs .. family. family ( biology ). marine. ocean. Many of the species are brightly colored and popular for aquaria .. aquaria. aquarium. The distinctive characteristic of the family is the scalpel-like spines , one or more on either side of the tail -LRB- `` thorn tails '' -RRB- , which are dangerously sharp .. family. family ( biology ). The dorsal , anal , and caudal fins are large , extending for most of the length of the body .. dorsal. dorsal fin. anal. anal fin. The small mouths have a single row of teeth used for grazing on algae .. Surgeonfishes sometimes feed as solitary individuals , but they also often travel and feed in schools .. Feeding in schools may be a mechanism for overwhelming the highly aggressive defense responses of small territorial damselfishes that vigorously guard small patches of algae on coral reefs .. Most species are relatively small and have a maximum length of 15 -- , but some members of the genus Acanthurus , some members of the genus Prionurus , and most members of the genus Naso can grow larger , with the whitemargin unicornfish -LRB- N. annulatus -RRB- , the largest species in the family , reaching a length of up to 1 m .. Acanthurus. Acanthurus. Naso. Naso ( genus ). Prionurus. Prionurus. family. family ( biology ). whitemargin unicornfish. whitemargin unicornfish. These fishes can grow quickly in aquaria , so average growth size and suitability should be checked before adding them to a marine aquarium .. marine. ocean. aquaria. aquarium