Rhynchostracion nasus   (Bloch,  1785) (Fish)
Organism information awaits expert curation
Class: Actinopterygii

Image copyrights: Teresa Zubi

Size: 18-120 mm

Color: Yellowish brown with a large dark spot generally in each scute; ventral side, free portion of caudal peduncle and caudal fin whitish. Dorsal, anal and pectoral light yellowish.

Head 3.7-3.9 in standard length, 4.6-4.9 in total length. Depth of body 3.0-3.1 in standard length, 3.7-3.8 in total length. Eye diameter 2.8-3.0 in head, 1.7-1.9 in snout and twice in concave interorbital space. A hump above mouth. Body five ridged, the lateral and pelvic ridges well developed. Both sides of the distinct dorsal ridge along the median line of back concave. Pectoral fin rounded, longest ray 1.6-1.7 in head. Longest dorsal ray 1.7-1.8 and longest anal ray 1.8-1.9 in head.
Number of spines and rays in the dorsal fin: i, 8; number of spines and rays in the anal fin: i, 8; number of rays in the pectoral fin: i, 9.

Remarks: Values in above description denote proportions.

Synonym (s)
Ostracion nasus Bloch, 1785
Rhynchostracion nasus Munro, 1955

Common Name (s)
• Gonu
• Thombu
• Small-nosed Boxfish
Economic Importance and Threats



• Tamil Nadu, Gulf of Mannar INDIA
• Tamil Nadu, Chennai Coast INDIA
• Lakshadweep, Agatti INDIA
• Lakshadweep, Amini INDIA
• Lakshadweep, Andrott INDIA
• Lakshadweep, Minicoy INDIA
• Lakshadweep INDIA
• Andaman and Nicobar Islands INDIA
• West Bengal (Lat: 21.45) (Long: 87.9) INDIA

Literature Source(s)
  • Wafar, MVM (2003) Checklists of reef fauna Available at - http://www.reefindia.org/
  • 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
  • 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
  • Jones, S and Kumaran, M (1980) Fishes of the Laccadive Archipelago The Nature Conservation and Aquatic Sciences Service, Trivandrum, Kerala 760 pp Available at - NIO, Goa
  • Starfish Available at - http://www.starfish.ch/
  • Talwar, PK (1990) Fishes of Andaman and Nicobar Islands: A synoptic survey Journal of the Andaman Science Association Andaman Science Association, Port Blair 6(2) 71-102 Available at - NIO,Goa
  • Pillai, PKM and Augustine, SK (2000) A code list of common marine living resources of the Indian seas CMFRI Special Publication No.12 CMFRI 1-115 Available at - eprints.cmfri.org.in/3975/1/Special_Publication_No_12_Revised.pdf
  • 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:2012-01-10

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