Premnas biaculeatus   (Bloch,  1790) (Fish)
Organism information awaits expert curation
Class: Actinopterygii

Image copyrights: Randall, J.E.

Size: 14-17 cm.

Color: Juveniles and males bright red, females become maroon to nearly black.

Height 2-2.1, 2.4-2.7 in length with caudal. Head 3.2-3.4, 4-4.2 in length with caudal and 1.2-1.3 in its own height. Eye 4.8-5.2, 1.8-2 in snout and 1.5-1.8 in convex inter orbital space. Mouth oblique, far below level of eye. Maxillary reaching to below front border of eye. Lips rather thick. Teeth incisiviform, in a single series in both jaws. Preopercle scaly, its posterior and inferior limb naked. Interopercle and subopercle scaly. Opercle scaleless, rugose. Preorbital spine about equal to eye, suborbital spine much longer, directed backwards and reaching on opercle. Preopercle strongly denticulated behind. About 20-23 rows of scales before dorsal, the first row on nap behind vertical through hind border of eye. First dorsal spine shorter than second, which is equal to snout and eye together. Following spines decreasing in size posteriorly, the 8th the shortest, the 9th and 10th equal and somewhat longer than the 8th, and half diameter of eye shorter than second spine. Soft dorsal much higher than spinous part, the 10th-12th rays longest and equal to head without snout. First anal spine small, second as long as second dorsal spine. Soft anal similar to soft dorsal. Pectorals rounded, equal to head. Ventrals somewhat shorter. Caudal rounded. Has a distinctive prominent preopercular spine that extends across the head-bar. Males are much smaller than females. Dorsal spines (total): 10; Dorsal soft rays (total): 17-18; Anal spines: 2; Anal soft rays: 13-15.

Associated with the anemone Entacmaea quadricolor (usually), Heteractis magnifica (occasionally) and Stichodactyla haddoni (rarely).

Has been reared in captivity.

Remarks: Values in above description denote proportions.

Synonym (s)
Chaetodon biaculeatus Bloch, 1790
(Senior synonym)
Holocentrus sonnerat Lacepede, 1802
(Junior synonym)
Lutianus trifasciatus Schneider 1801
(Junior synonym)
Premnas epigrammata Fowler, 1904
(Junior synonym)
Premnas gibbosus Castelnau, 1875
(Junior synonym)
Premnas semicinctus Cuvier, 1830
(Junior synonym)
Premnas unicolor Cuvier, 1829
(Junior synonym)
Sargus ensifer Gronow, 1854
(Junior synonym)
Scorpaena aculeata Lecepede, 1802
Premnas trifasciatus Cuvier and Valenciennes, 1830
Sargus ensifer Gray, 1854
Premnas biaculeatus Bleeker, 1854
Premnas biaculeatus Gunther, 1862
Premnas biaculeatus De Crespigny, 1869
Premnas biaculeatus Day, 1877
Premnas biaculeatus Bleeker, 1877
Premnas biaculeatus Macleay, 1882
Premnas biaculeatus Vinciguerra, 1926
Premnas biaculeatus Ahl, 1926
Premnas biaculeatus Montalban, 1927
Premnas biaculeatus Fowler and Bean, 1928
Premnas biaculeatus Fowler, 1928
Premnas biaculeatus McCulloch, 1929

Common Name (s)
• Spine Cheek Anemonefish (English)
• Maroon Clown (English)
Economic Importance and Threats
Importance:  Commercial

Habitat:  Reef Associated
Trophic Level:  Consumer
Prey:  Plants, benthic algae/weeds, zooplankton, other planktonic invertebrates


• Andaman and Nicobar Islands, North Bay INDIA (Record: 2000-2005)
• Andaman and Nicobar Islands, Chidiya Tapu INDIA (Record: 2000-2005)
• Andaman and Nicobar Islands, Car Nicobar INDIA (Record: 2000-2005)
• Andaman and Nicobar Islands, Campbell Bay INDIA (Record: 2000-2005)

Literature Source(s)
  • Madhu, R and Madhu, K (2007) Occurrence of anemonefishes and host sea anemones in Andaman and Nicobar Islands Journal of the Marine Biological Association of India The Marine Biological Association of India, Cochin 49(2) 118-126 Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Froese, R and Pauly, D (2000) Fishbase 2000: Concepts, design and data sources ICLARM 344 pp Available at -
  • Beaufort, LF (1940) The fishes of the Indo-Australian Archipelago A. J. Reprints agency, Karol Bagh, New Delhi 8 508 pp Available at - NIO, Goa

Page last updated on:2010-05-10

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