Doublebar Chromis, Chromis opercularis (Günther 1867)

Other Names: Lightning Double Bar Chromis

A Doublebar Chromis, Chromis opercularis, at Kiritimati Island. Source: David R / License: CC By Attribution-NonCommercial-NoDerivatives

A silvery-grey to a bronzy-brown chromis with a dark bar on the gill cover behind the eye, a broad dark bar behind the head running onto the pectoral-fin base, dark-edged scales, and a broad pale or transparent margin on the dorsal and anal fin. Juveniles are silvery-blue with elongate yellow caudal-fin lobes.

In the Australian EEZ, this species in known only from Cocos (Keeling) Islands and Christmas Island in the eastern Indian ocean.

Cite this page as:
Bray, D.J. 2018, Chromis opercularis in Fishes of Australia, accessed 12 Jul 2020,

Doublebar Chromis, Chromis opercularis (Günther 1867)

More Info


Cocos (Keeling) Islands and Christmas Island, eastern Indian Ocean, AUS EEZ. Elsewhere the species is widespread in the Indo-west Pacific. Inhabits outer reef slopes and deep lagoons.


Dorsal-fn rays XIII, 10 or 11 (mode 11); anal-fn rays II, 10 or 11 (11); pectoral-fn rays 18–20 (19); upper and lower procurrent caudal-fn rays 3; pored lateral-line scales 17 or 18 (18); gill rakers 6–8 (7) + 19–22 (21) = 26–30 (28); longest dorsalfn soft ray length 24.6–36.4% (mean 29.4%) of SL; frst anal-fn spine length 6.5–8.4% (7.1%) of SL; caudal-fn length 43.9–59.8% (48.6%) of SL; posterior tips of caudal-fn lobes flamentous.


broad black bands along preopercular and opercular margins, sum width of two bands 15.3–27.9% (23.6%) of head length; distal half of soft-rayed portion of dorsal fin transparent in adults; no triangular black blotches at upper or lower caudal-fin base; caudal peduncle and fin tinged with yellow; soft-rayed portions of dorsal and anal fins yellowish, but spinous portion of dorsal fin and pelvic fin dark blue in juveniles.

Species Citation

Heliastes opercularis Günther 1867, Fishes of Zanzibar: 84, Pl. 11 (fig. 2). Type locality: Zanzibar, Tanzania, western Indian Ocean


Bray, D.J. 2018


Australian Faunal Directory

Doublebar Chromis, Chromis opercularis (Günther 1867)


Allen, G. R. 1986. Family 219: Pomacentridae. pp. 670-682 in Smith, M.M. & Heemstra, P.C. (eds). Smith's Sea Fishes. Johannesburg : Macmillan South Africa xx + 1047 pp. 144 pls. 

Allen, G. R. 2001. Family Pomacentridae. pp. in Carpenter, K.E. & Niem, T.H. (eds). The Living Marine Resources of the Western Central Pacific. FAO Species Identification Guide for Fisheries Purposes. Rome : FAO Vol. 6 pp. 3381-4218. 

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

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 Cocos (Keeling) Islands. Atoll Research Bulletin 412: 1-21 

Hobbs, J-P.A., Newman, S.J., Mitsopoulos, G.E.A., Travers, M.J., Skepper, C.L., Gilligan, J.J., Allen, G.R., Choat, H.J. & Ayling, A.M. 2014. Checklist and new records of Christmas Island fishes: the influence of isolation, biogeography and habitat availability on species abundance and community composition. Raffles Bulletin of Zoology Supplement 30: 184–202 

Hobbs, J-P.A., Newman, S .J., Mitsopoulos, G.E.A., Travers, M.J., Skepper, C.L., Gilligan, J.J., Allen, G.R., Choat, H.J. & Ayling, A.M. 2014. Fishes of the Cocos (Keeling) Islands: new records, community composition and biogeographic significance. Raffles Bulletin of Zoology Supplement 30: 203–219 

Motomura, H., Nishiyama, H. & Chiba, S.N. 2017. Review of the Chromis xanthura species group (Perciformes: Pomacentridae), with description of a new species. Ichthyological Research:  [1-15] Abstract

Playfair, R. L. & Günther, A. 1867. The fishes of Zanzibar, with a list of the fishes of the whole east coast of Africa. London pp. i-xix + 1-153, pls 1-21.

Quick Facts

CAAB Code:37372148

Depth:4-40 m

Habitat:Reef associated

Max Size:17 cm TL

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