Acanthurus blochii (Valenciennes, 1835)
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Acanthurus blochii (Valenciennes, 1835)

Genus: ,

Scientific Name: Acanthurus blochii (Valenciennes, 1835)

English Name: Ringtail surgeonfish

Creole Name: Sirizyen lezel zonn

French Name: Chirurgien à queue rayée

IUCN Red List Status: Least Concern (LC)

Description:

Dorsal spines: 9; Dorsal rays: 25-27; Anal spines: 3; Anal rays: 24-25.

Blue grey body with, in life, numerous very small brownish yellow spots that tend to form irregular longitudinal lines. Head with irregular yellow-brown stripes and an irregular orange-yellow spot behind the eye. Opercular membrane black. Dorsal fin yellow with narrow blue bands. A narrow blue margin on the dorsal, anal caudal fins. A blue to black margin around caudal spine socket. Base of caudal fin usually encircled by a white bar. Vertical stripes apparent in the central area of the caudal fin . Underwater this fish may appear black with a lighter bar across the caudal peduncle.


Size:

Maturity: Lm unknown. Range unknown. Max Length: 45cm TL.


Habitat and Ecology:

Adults in outer lagoons and seaward reefs (depth 2-15m), usually in small groups. Juveniles settle in coral rubble. Grazer/detrivore feeds on the algal film covering compacted sand, diatoms and detritus.


Fishery Status:

This species is not protected or subject to fishery regulations. It is caught in the fish trap fishery, it is unclear how abundant it is the catch because a cursory glance of dead specimens it can readily be mistaken for A. xanthopterus, A. dussumieri or A. mata.


Notes:

A. blochii is often confused with A. xanthopterus with which it shares its Creole name. The latter differs in having the outer third of the pectoral fin yellow and the dorsal fin with 4 blue bands as opposed to 8 in A. blochii. A. blochii differs from A. dussumieri in having vertical stripes rather than spots on the blue central area of the caudal fin. It differs from A. mata in having a lunate caudal fin.


References:

Bray, D.J. 2017, Acanthurus blochii in Fishes of Australia, http://fishesofaustralia.net.au/home/species/1022 (06/11/18).

Choat, J.H. et al. 2012. Acanthurus blochii. The IUCN Red List of Threatened Species 2012: e.T177971A1507181. http://dx.doi.org/10.2305/IUCN.UK.2012.RLTS.T177971A1507181.en. (06/11/18).

Froese, R. & D. Pauly. Eds. 2018. FishBase. https://www.fishbase.de/summary/acanthurus-dussumieri (06/11/18).

McGrouther, M. (2013). Dark Surgeon, Acanthurus blochii. https://australianmuseum.net.au/dark-surgeon-acanthurus-blochii-valenciennes-1835 (06/11/18).

Randall, J.E. (2001). Surgeonfishes of Hawaii and the World. ISBN: 1-56647-561-9

 


Citation:

Nevill, J.E.G. & Mason-Parker, C. (2019). Acanthurus blochii, Ringtail surgeonfish. www.seatizens.sc. (Updated 05/05/20). 


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