Eleutherochir opercularis   (Valenciennes,  1837) (Fish)
Organism information awaits expert curation
Class: Actinopterygii

Image copyrights: FAO

Size: 8-11 cm.

Color: Head and body brown or yellow, belly lighter. Back with small light spots and dark blotches. First dorsal fin black. Anal fin whitish. Pelvic fins dark and brown or black. Second dorsal, caudal, and pectoral fins spotted with dark brown.

Height 5.7-6, 7.2-7.5 in length with caudal. Head measured from branchial opening 2.9, 3.6-3.9 in length with caudal. Breadth of head 1.2 in its length, measured as above. eye 3.9-4.4, 1.2-1.4 in snout. Inter orbital space slightly concave, equal to or three fourths of eye. Mouth slightly oblique, lower jaw included. Maxillary reaching to below front border of eye. About 3 rows of small pointed teeth in the jaws. Preopercular process somewhat curved, without anterior spine, ending in a hooked spine which may be bifid, and with 3-6 strong spines along its upper border. Area behind eyes smooth in the middle, on both sides a rugose patch with low radiating ridges and covered by smooth skin. Lateral lines ramose in their anterior part, connected by a transverse branch at their origin, and continued forward, bifurcating into one branch directed downwards and running along the posterior border of the preopercle, and another running forwards, bending downwards behind eye, and ending below it. All these branches curved and more or less ramose. Posteriorly the lateral lines are continued on caudal, and are connected by a transverse branch over caudal peduncle. First dorsal low, the first spine equal to snout. Median rays of second dorsal longer than the anterior and the posterior ones, and equal to snout and eye. First anal ray equal to eye, rays increasing in length posteriorly, the last ray somewhat longer than snout. Pectorals equal to distance between tip of snout and base of preopercular process, ventrals slightly shorter. Caudal truncate. Body without lateral fold of skin below lateral line. Inter-orbital distance more than eye diameter. Dorsal spines (total): 4; Dorsal soft rays (total): 9; Anal soft rays: 9

Remarks: Values in the above description denote proportions.

Synonym (s)
Callionymus opercularis Valenciennes, 1837
(Senior synonym)
Pogonymus goslinei Rao, 1976
(Junior Synonym)
Callionymus opercularis Cuvier and Valenciennes, 1837
Callionymus opercularoides Bleeker, 1850
Callionymus opercularis Gunther, 1861
Callionymus opercularis Day, 1876
Eleutherochir opercularoides Bleeker, 1879
Callionymus opercularis M. Weber, 1913
Callionymus kellersi Fowler and Bean, 1927

Common Name (s)
• Indian Dragonet (English)
Economic Importance and Threats

Habitat:  Demersal, Estuarine
Trophic Level:  Consumer


• Tamil Nadu, Chennai INDIA
• Tamil Nadu, Gulf of Mannar INDIA
• West Bengal (Lat: 21.45) (Long: 87.9) INDIA

Literature Source(s)
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Marine Biological Station, Chennai, Tamil Nadu (2003) Checklist of marine fauna of Tamil Nadu Department of Environment, Government of Tamil Nadu Available at - http://tnenvis.nic.in
  • Froese, R and Pauly, D (2000) Fishbase 2000: Concepts, design and data sources ICLARM 344 pp Available at - http://www.fishbase.org
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Dr. Ramesh, R; Dr. Nammalwar, P and Dr. Gowri, VS (2008) Database on coastal information of Tamil Nadu Report Submitted to Environmental Information System (ENVIS) Centre, Department of Environment, Government of Tamil Nadu Institute for Ocean Management, Anna University, Chennai, Tamil Nadu. Available at - http://tnenvis.nic.in/PDF/coastal%20data.pdf
  • 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
  • Fischer, W and Bianchi, G (Eds.) (1984) FAO species identification sheets for fishery purposes. Western Indian Ocean; (Fishing area 51). FAO, Rome 1 Available at - http://www.fao.org/docrep/009/ad468e/ad468e00.HTM#Contents
  • Das, P; De, SP; Bhowmik, RM; Pandit, IK; Sengupta, R; Nandi, AC; Thakurta, SC and Saha, S (2007) Piscine diversity of West Bengal Fishing chimes 27(5) 15-28 Available at - NIO, Goa

Page last updated on:2012-01-24

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