Ctenochaetus truncatus Randall & Clements 2001

Other Names: Indian Gold Ring Bristletooth, Indian Gold-ring Bristle-tooth, Spotted Yellow Eye Tang, Truncate Bristletooth, Yelloweye Bristletooth

Ctenochaetus truncatus, at Banda Aceh, Indonesia. Source: Graham Edgar / Reef Life Survey. License: CC BY Attribution

Abundant at Christmas Island in the Indian Ocean.

Cite this page as:
Dianne J. Bray, Ctenochaetus truncatus in Fishes of Australia, accessed 23 Mar 2023, https://fishesofaustralia.net.au/home/species/4938

Ctenochaetus truncatus Randall & Clements 2001

More Info


Recorded from the Australian territories of Christmas and Cocos (Keeling) islands in the Indian Ocean. Elsewhere, widespread in the Indian Ocean from East Africa to Natal, to the Andaman Sea off Thailand, Cocos Keeling Islands and Christmas Island. The species is common in parts of its range, and is one of the most abundant surgeonfishes at Christmas Island.

Inhabits shallow coral and rocky reefs.


Meristic features: Dorsal fin VIII, 24-25; Anal fin III, 22-23. 

Margins of lips papillate. Only species of Ctenochaetus with angular dorsal and anal fins. Caudal fin of juveniles forked, of adults lunate. Gill rakers on anterior row 20-21, on posterior row 20. Outer soft portion of dorsal and anal fins orange (pale in preservative). Caudal fin white. Edge of lips crenulate. Upper teeth with 2 or 3 denticulations (not including tip). Anterior gill rakers 19-23 (Ref 42056). 


Thsi species, like all members of the genus Ctenochaetus, feeds on detritus (comprised of diatoms, algal fragments, organic material and fine inorganic sediment) scraped and sucked up from the substrate.

Species Citation

Ctenochaetus tominiensis Randall, 1955, Zoologica 40(4):  163. Type locality: Gulf of Tomini, Sulawesi. 


Dianne J. Bray

Ctenochaetus truncatus Randall & Clements 2001


Allen, G.R. & Erdmann, M.V. 2012. Reef fishes of the East Indies. Perth : Tropical Reef Research 3 vols, 1260 pp.

Allen, G.R. & Smith-Vaniz, W.F. 1994. Fishes of the Cocos (Keeling) Islands. Atoll Research Bulletin 412: 1-21. (as Ctenochaetus strigosus)

Allen, G.R., Steene, R.C. & Orchard, M. 2007. Fishes of Christmas Island. Christmas Island : Christmas Island Natural History Association 2 edn, 284 pp.

Choat, J.H., Clements, K.D. & Robbins, W.D. 2002. The trophic status of herbivorous fishes on coral reefs. 1. Dietary analyses. Marine Biology 140: 613-623.

Clements, K.D., Choat, J.H., Abesamis, R., McIlwain, J., Myers, R., Nanola, C., Rocha, L.A., Russell, B. & Stockwell, B. 2012. Ctenochaetus truncatus. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. . Downloaded on 24 March 2014.

Randall, J.E. 2001. Surgeonfishes of Hawai'i and the World. Honolulu : Mutual Publishing and Bishop Museum Press 125 pp.

Randall, J.E. 2005. Reef and shore fishes of the South Pacific. New Caledonia to Tahiti and the Pitcairn Islands. Honolulu : University of Hawaii Press 707 pp.

Quick Facts

CAAB Code:37437055

Conservation:IUCN Least Concern

Depth:1-21 m

Fishing:Aquarium fish

Habitat:Reef associated

Max Size:16 cm SL

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