Doublebar Chromis, Chromis opercularis (Günther 1867)


Other Names: Lightning Double Bar Chromis

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

Summary:
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 30 Jan 2020, http://136.154.202.208/home/species/4953

Doublebar Chromis, Chromis opercularis (Günther 1867)

More Info


Distribution

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.

Features

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.

Colour

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

Author

Bray, D.J. 2018

Resources

Australian Faunal Directory

Doublebar Chromis, Chromis opercularis (Günther 1867)

References


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] https://doi.org/10.1007/s10228-017-0601-8 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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