Rexea prometheoides   (Bleeker,  1856) (Fish)
Organism information awaits expert curation
Class: Actinopterygii

Image copyrights: CSIRO

Size: 17.3-40 cm.

Color: Body color is grayish with silvery tint; the fins hyaline except for the black blotch on the fin membranes between the first and the third first dorsal spines.

Lateral line branching below the 4th to the 5th spine of the first dorsal fin; the upper branch reaching the middle to end of the second dorsal-fin base; the lower branch running mid laterally. Body naked except for a large scaly patch extending around the posterior portion of the lower lateral line. The pelvic fin is represented by a single spine in smaller specimens but is entirely absent in specimens over 18 - 20 cm SL. Height 6.25, 7 in length with caudal. Head 3, 3.38 in length with caudal. Eye 4, 1.5 in snout. Inter orbital space concave, 1.5 in eye. Mouth somewhat oblique. Maxillary almost reaching to below front border of pupil. Lower jaw prominent, the two anterior canines in the lower jaw remain outside the mouth, when last named is closed. anterior fangs in the upper jaw somewhat curved, much longer than those of the lower jaw. Origin of first dorsal slightly behind hind border of preopercle. Anterior and posterior spines of first dorsal somewhat shorter than the median ones, the length of which barely exceeds eye in length, Second dorsal originating close to end of first dorsal, the rays longest, almost equal to eye. Origin of anal slightly behind that of second dorsal, the first spine of anal minute, separated from the rest of the fin. Pectorals with a narrow base, pointed, slightly longer than snout and half eye. Ventrals minute rudiments, in front of base pectorals. Dorsal spines (total): 19 - 20; Dorsal soft rays (total): 14 - 17; Anal spines: 2; Anal soft rays: 12 - 15; Vertebrae: 34.

Remarks: Values in above description denote proportions.

Synonym (s)
Thyrsites prometheoides Bleeker, 1856
Thyrsites bengalensis Alcock, 1894
Thyrisites (Promethichthys) bengalensis Alcock, 1899
Rexea prometheoides Waite, 1911
Dicrotus prometheoides M. Weber, 1913
Rexea solandri (non Cuvier) Matsubara & Iwai, 1952
Jordanidia prometheoides (Bleeker, 1856)
Jordanidia raptoria Snyder, 1911
Rexea promethoides Bleeker, 1856)
Reyea prometheoides (Bleeker, 1856)
Thyrsites prometheoides Bleeker, 1856

Common Name (s)
• Royal Escolar (English)
Economic Importance and Threats
Importance:  Commercial
(Utilized as a food, fish food; marketed fresh or iced)

Habitat:  Pelagic, Bentho Pelagic, Coastal
Trophic Level:  Consumer
Prey:  Fishes, crustaceans, and cephalopods.


• Bay of Bengal INDIA
• Kerala, Off Alleppey INDIA (Depth: 329.184 mts)
• Bay of Bengal INDIA (Record: 02/1985-06/1987) (Depth: 32-119 mts)
• Andaman Sea (Lat: 13.5) (Long: 80) INDIA (Record: 02/1985-06/1987) (Depth: 32-119 mts)
• Andaman Sea (Lat: 20.5) (Long: 87.36) INDIA (Record: 02/1985-06/1987) (Depth: 32-119 mts)
• Andaman Sea (Lat: 12.5) (Long: 90.53) INDIA (Record: 02/1985-06/1987) (Depth: 32-119 mts)
• Off South West Coast INDIA (Record: 01/1962-12/1968) (Depth: 101-450 mts)
• Off Kerala INDIA

Literature Source(s)
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Beaufort, LF and Chapman, WM (1951) The fishes of the Indo-Australian Archipelago A. J. Reprints agency, Karol Bagh, New Delhi 9 484 pp Available at - NIO, Goa
  • Froese, R and Pauly, D (2000) Fishbase 2000: Concepts, design and data sources ICLARM 344 pp Available at -
  • Fischer, W and Bianchi, G (Eds.) (1984) FAO species identification sheets for fishery purposes. Western Indian Ocean (Fishing Area 51) FAO, Rome 2 Available at -
  • Tholasilingam, T; Venkataraman, G and Krishna Kartha, KN (1964) On some Bathypelagic fishes taken from the Continental slope off the South West Coast of India Journal of the Marine Biological Association of India Central Marine Fisheries Research Sub-Station, Ernakulam 6(2) 268-284 Available at -
  • Silas, EG (1969) Part-1 Exploratory otter trawling surveys by R.V. Varuna and other vessels operating in association with her from the continental shelf edge and the upper continental slope off the south-west coast of India Exploratory fishing by R.V. Varuna Bulletin Of Central Marine Fisheries Research Institute CMFRI, Cochin 12 7-51 Available at -
  • Murty, VS (1969) Catalogue of fishes (excluding from the Laccadives) in the reference collections of the Central Marine Fisheries Research Institute Bulletin of Central Marine Research Institute CMFRI, Cochin 10 1-38 Available at -

Page last updated on:2011-06-01

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