Sohal surgeonfish (Acanthurus sohal)

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Side view of a Sohal surgeonfish
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Sohal surgeonfish fact file

Sohal surgeonfish description

KingdomAnimalia
PhylumChordata
ClassActinopterygii
OrderPerciformes
FamilyAcanthuridae
GenusAcanthurus (1)

A beautiful fish of tropical reefs in the Indian Ocean, the sohal surgeonfish (Acanthurus sohal) is vividly coloured with striking blue and white stripes stretching along the body and jet black fins with yellow margins (3). This attractive fish is dark blue on the upperside, fading to silver on the sides, and whitish on the underside (4) (5). There are narrow blackish stripes on the head above the eyes, faint grey lines below the head and chest, and patches of orange beneath the pectoral fins and around the razor-sharp, long, slender tail spine (4) (5) (6). This spine normally sits flattened in a groove, but when the fish is disturbed or threatened this formidable weapon is rapidly erected and can be used to inflict slashing wounds on other fish (6). The distinctive sohal surgeonfish also has a deep, elongated, flattened body, with the eyes positioned high on the head, and a well-defined, concave tail fin with long, elaborate lobes, which are black with a vibrant blue edge and a large diffuse brown area in the centre (2) (4) (5). The mouth is small, but armed with an impressive array of small, sharp teeth which are used to rasp algae on rocks (2) (6).

Also known as
Arabian surgeonfish, Red Sea clown surgeonfish, Red Sea surgeonfish, sohal, sohal tang.
Synonyms
Acanthurus carinatus, Aspisurus sohar, Chaetodon sohal, Chaetodon sohar, Choetodon sohab, Ctenodon ruppeli.
Size
Maximum length: 40 cm (2)
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Sohal surgeonfish biology

An inquisitive and bold fish, the sohal surgeonfish aggressively defends a territory from other fish (3). Like other surgeonfishes, it has a sharp spine at the base of its tail and can use this to slash at other fish by rapidly sweeping its tail to the side (2). It feeds on various kinds of algae which it scrapes off rocks with its sharp teeth (2)

Little else is known of the sohal surgeonfish’s biology, but like other surgeonfish it probably breeds in aggregations over relatively deep, open water, the timing of which is determined by the lunar cycle (2) (3).

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Sohal surgeonfish range

The sohal surgeonfish is found in the western Indian Ocean from the Red Sea to the Arabian Gulf (2).

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Sohal surgeonfish habitat

A common species in coral reefs, the sohal surgeonfish is most commonly found around the outer edge of reefs that are exposed to surge (3) (5).

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Sohal surgeonfish status

The sohal surgeonfish is classified as Least Concern (LC) on the IUCN Red List (1).

IUCN Red List species status – Least Concern

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Sohal surgeonfish threats

There are no known major threats to the sohal surgeonfish, but as a species that inhabits reefs, it could be adversely affected by a number of activities that degrade or destroy coral reef habitats, such as pollution and irresponsible development, as well as global climate change (7) (8). It is also captured across its range in artisanal fisheries (2).

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Sohal surgeonfish conservation

The sohal surgeonfish has not been the target of any known conservation measures. However, its range overlaps a number of Marine Protected Areas, which may offer it some protection (1).

Environment Agency - Abu Dhabi is a principal sponsor of ARKive. EAD is working to protect and conserve the environment as well as promoting sustainable development in the Emirate of Abu Dhabi.
View information on this species at the UNEP World Conservation Monitoring Centre.
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Find out more

To find out more about the conservation of fish, see:

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Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
arkive@wildscreen.org.uk

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Glossary

Algae
Simple plants that lack roots, stems and leaves but contain the green pigment chlorophyll. Most occur in marine and freshwater habitats.
Pectoral fins
In fish, the pair of fins that are found one on each side of the body just behind the gills. They are generally used for balancing and braking.
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References

  1. IUCN Red List (February, 2013)
    http://www.iucnredlist.org/
  2. FishBase – Sohal surgeonfish (November, 2010)
    http://www.fishbase.org/Summary/speciesSummary.php?ID=4740&genusname=Acanthurus&speciesname=sohal
  3. World Association of Zoos and Aquariums – Sohal surgeonfish (November, 2010)
    http://www.waza.org/en/zoo/choose-a-species/fishes/bony-fishes/acanthurus-sohal
  4. U.S. Geological Society – Sohal surgeonfish (November, 2010)  
    http://fl.biology.usgs.gov/documents/Acanthurus_sohal.pdf
  5. Randall, J.E. (1996) Coastal Fishes of Oman. University of Hawaii Press, Honolulu.
  6. Campbell, A. and Dawes, J. (2004) Encyclopedia of Underwater Life. Oxford University Press, Oxford.  
  7. Wilkinson, C. (2004) Status of Coral Reefs of the World: 2004. Volume 3. Australian Institute of Marine Science, Townsville, Australia.
  8. Carpenter, K.E. et al. (2008) One-third of reef-building corals face elevated extinction risk from climate change and local impacts. Science, 321: 560-563.
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Image credit

Side view of a Sohal surgeonfish  
Side view of a Sohal surgeonfish

© Georgette Douwma / naturepl.com

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