Acanthurus nigrofuscus

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Acanthurus nigrofuscus
Acanthurus nigrofuscus by NPS.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Acanthuridae
Genus: Acanthurus
Species: A. nigrofuscus
Binomial name
Acanthurus nigrofuscus
(Forsskål, 1775)

Acanthurus nigrofuscus, also known as the Lavender tang, Brown Tang, or Spot-Cheeked Surgeonfish, is a tang from the Indo-Pacific and Hawaii. It commonly makes its way into the aquarium trade. It grows to 21 cm in length.[1] Recently, a huge bacterium discovered in its intestine, Epulopiscium fishelsoni,[2][3] has been found to grow as large as 600 by 80 μm, a little smaller than a printed hyphen, which controls the pH of its host's gut, thereby influencing its host's ability to digest food and absorb nutrients.


The Lavender Tang is an herbivore that grazes primarily on benthic algae. In captivity, they will also feed on animal matter such as brine shrimp and mysis shrimp.


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  2. ^ Angert ER, Clements KD, Pace NR (1993). "The largest bacterium". Nature 362 (6417): 239–241. doi:10.1038/362239a0. PMID 8459849. 
  3. ^ Angert ER, Brooks AE, Pace NR (1996). "Phylogenetic analysis of Metabacterium polyspora: Clues to the evolutionary origin of Epulopiscium spp., the largest bacteria". Journal of Bacteriology 178 (5): 1451–6. PMC 177821. PMID 8631724.