Polynemus sextarius   Bloch and Schneider,  1801 (Fish)
Organism information awaits expert curation
Class: Actinopterygii

Size: 19-30 cm.

Color: In alcohol specimen golden, fins yellowish, more or less dusky. Inner side of operculum pigmented with black, shining through at the outside. A large black blotch at the beginning of the lateral line.

Height 2.8-2.9, 3.7-3.8 in length with caudal. Head 2.8-3.3, 3.8-4.4 in length with caudal. Eyes covered by a gelatinous membrane, 3-3.8, twice in postorbital part of head and somewhat more than interorbital space. Snout 2/3 length of eye, promenent. Mouth larger, reaching far behind eye. Maxillaries scaly, 2.4 in head. Head covered with scales to tip of snout. Anterior and posterior nostrils close together, midway between eye and point of snout. Praeoperculum coarsely serrated along its hindborder, the lowermost serrations the longest. Its angle produced and rounded. A short, rather strong spine at the beginning of the lateral line. Upper lip feebly developed, lower lip well developed, not continuous at the symphysis. Band of villiform teeth on jaws, not extending to their outside, a similar band on palatines. Vomer without teeth. Origin of first dorsal between that of ventrals and pectorals. First dorsal spine of first dorsal minute, second one the strongest but not so long as the third, somewhat shorter than snout and eye. Origin of second dorsal well in advance of that of anal. Spine of second dorsal less than half as long as second one of first dorsal and somewhat shorter than second anal spine. First anal spine very small. Dorsal, anal and proximal part of caudal scaly. Caudal deeply forked, the lobes pointed. Pectorals slightly falciform, 12-13of their rays divided, equal to distance between middle of eye and hindborder of operculum. The two upper free pectoral filaments are about of equal length and longer than the others, they reach to middle of ventrals or somewhat farther. Ventrals 5/7 length of pectorals. Distance between origin of ventrals and anal much less than length of head, somewhat more than postorbital part of head. Scales with a finely striated and crenulated hindborder.

Remarks: Values in above description denote proportions.

Synonym (s)
Polydactylus sextarius (Bloch & Schneider, 1801)
Polydactylus sextarius Bleeker, 1849
Polynemus sextarius Cantor, 1850
Polynemus sextarius Gunther, 1860
Trichidion sextarius Bleeker, 1865
Polynemus sextarius Day, 1888
Polynemus sextarius Gilchrist and Thompson, 1908
Trichidion sectarium Jordan and Starks, 1917

Common Name (s)
• Blackspot Threadfin (English)
Economic Importance and Threats
Importance:  Commercial
(Marketed fresh or frozen, dried and salted, Fisheries)

Habitat:  Estuarine, Sandy
Prey:  Small crustaceans (especially shrimps), fishes and bottom living organisms


• West Bengal, Digha Coast (Lat: 21.61) (Long: 87.53) INDIA
• North Andaman Sea INDIA
• Orissa, Puri INDIA
• Tamil Nadu, Rameswaram INDIA
• Gujarat INDIA
• Andhra Pradesh, Off Visakhapatnam (Lat: 17.73) (Long: 83.55) INDIA (Record: 04/1989-03/1990) (Depth: 50 mts)
• Gujarat, Veraval Coast INDIA
• Andhra Pradesh, Visakhapatnam Coast INDIA

Literature Source(s)
  • Madhavi, R (1974) Digenetic trematodes from marine fishes of Waltair coast Bay of Bengal family Monorchiidae Rivista di Parassitologia 35(2) 87-98 Available at - NCL, Pune
  • Kabata, Z and Tareen, IU (1981) A new species of Thysanote Kroyer, 1863 (Copepoda, Lernaeopodidae) from the Persian Gulf, with comments on the genus Systematic Parasitology 3(2) 97-103 Available at - Zoological records
  • Goswami, BCB (1992) Marine fauna of Digha coast of West Bengal, India Journal of Marine Biological Association of India The Marine Biological Association of India, Cochin 34 115-137 Available at - NIO, RC Kochi
  • (1982) A colour guide to the fishes of the south China sea and the Andaman sea Seafood Industries Association, Singapore Available at - CMFRI, Kochi
  • Suppa, M; Suebsin, S; Suri, V and Songsirikul, T (1997) Checklist of fishes in Thailand Office of Environmental Policy and Planning 1-353 Available at - CMFRI, Kochi
  • Tun, MT (2001) Marine fishes of Myanmar (pelagic and demersal) U Than Tun, Director-General, Department of Fisheries, Ministry of Livestock and Fisheries, Myanmar 276 pp Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Weber, M; Beaufort, LF (1922) The fishes of the Indo-Australian Archipelago Print times, Pataudi house, Daryaganj, New Delhi 4 410 pp Available at - NIO, Goa
  • 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 - http://eprints.cmfri.org.in/571/1/Bulletin_10.pdf
  • Kizhakudan, SJ; Nair, KVS and Zala, MS Demersal Finfish Resources of Gujarat Sustainable fisheries development: Focus on Gujarat 57-66 Available at - http://eprints.cmfri.org.in/6060/
  • Bapat, SV; Deshmukh, VM; Krishnamoorthi, B; Muthiah, C; Kagwade, PV; Ramamirtham, CP; Mathew, KJ; Pillai, SK and C. Mukundan (1982) Species composition, distribution and abundance of major groups/species Fishery resources of the Exclusive Economic Zone of the NorthWest coast of India Bulletin Of Central Marine Fisheries Research Institute CMFRI, Kochi 33 1-86 Available at - http://eprints.cmfri.org.in/808/1/Bulletin_No_33.pdf
  • 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
  • Sujatha, K (1995) Finfish constituents of trawl by-catch off Visakhapatnam Fishery Technology Society of Fisheries Technologists 32(1) 56-60 Available at - NIO, Goa
  • Biswas, KP (2009) Fishes around Indian Ocean Dominant Fish Groups Occurring in Indian Coasts Daya publishing house Available at - NIO,Goa

Page last updated on:2012-01-06

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