Eleutheronema tetradactylum   (Shaw,  1804) (Fish)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Chordata
Class: Actinopterygii
Order:Perciformes
Family:Polynemidae

Image copyrights: Randall, J.E.

Description
Size: 50-200 cm.

Max. weight reported: 145.0 kg

Color: Body silvery green above, cream below; dorsal and caudal fins grey, dusky at edges, pelvic and anal fins orange, pectoral filamentous rays white.

Pectoral filaments 4; fin membranes vivid yellow in life, except in large specimens. Vomer with deciduous tooth plates on both sides, except in juveniles. Posterior part of maxilla deep, 3-4% of SL. Short tooth plate extension onto lateral surface of lower jaw. 7-9% SL. Dorsal spines (total): 9; Dorsal soft rays (total): 13 - 15; Anal spines: 3; Anal soft rays: 14 - 16.

Protandrous hermaphrodites, external fertilization. Hermaphroditic blue threadfin develop from 1-2-year-old fish, and females first appear as 2-3-year-old individuals. Male fish probably commence sex reversal immediately after spawning and this condition may persist until after the next spawning period. The progression from hermaphrodites to females is complete by the following season.

They usually form loose schools, although larger fish are more often observed in pairs or singly.


Synonym (s)
Polynemus coecus Macleay, 1878
(Junior synonym)
Polynemus teria Hamilton, 1822
(Junior synonym)
Polynemus tetradactylus Shaw, 1804
(Senior synonym)
Polynemus tetradactylus (Shaw, 1804)
(Basionym)
Eleutheronema tetradactylus (Bleeker, 1862)
Polynemus tetradactylus (Day, 1878)
Polydactylus tetradactylus (Jordan and Richardson, 1908)
Polydactylus rhadinus (Jordan and Richardson, 1902)
Polydactylus pleblus (Fowler, 1918)
Eleutheronema tetradactyla (Shaw, 1804)
(Misspelling)
Eleutheronema tetradactylus (Shaw, 1804)
(Misspelling)
Eleuthronema tetradactylum (Shaw, 1804)
(Misspelling)

Common Name (s)
• Guchhia (Bengali)
• Sahal (Bengali)
• Bamin (English)
• Bastard Mullets (English)
• Burnett Salmon (English)
• Four Tasselfish (English)
• Four Thread Tassel Fish (English)
• Fourfinger Threadfin (English)
• Horse's Friend (English)
• Indian Salmon (English)
• King Fish (English)
• Row Ball (English)
• Thread Fin (English)
• White Salmon (English)
• Rawas (Gujarati)
• Ramsi (Kannada)
• Vahmeenu (Kannada)
• Vameenu (Kannada)
• Baameen (Malayalam)
• Bahmin (Malayalam)
• Norakudiyan (Malayalam)
• Thamuthi (Malayalam)
• Wahmeen (Malayalam)
• Rawas (Marathi)
• Sahal (Oriya)
• Battihiravalai (Tamil)
• Kala (Tamil)
• Kattikalai (Tamil)
• Kondiangalai (Tamil)
• Panigala (Tamil)
• Pozhakkala (Tamil)
• Seenakalai (Tamil)
• Thiravalai (Tamil)
• Valanakala (Tamil)
• Vellaikala (Tamil)
• Yevakala (Tamil)
• Boddumaga (Telugu)
• Budathamaga (Telugu)
• Maga (Telugu)
• Podikimaga (Telugu)
• Sahala (Telugu)
• Thellamaga (Telugu)
• Polunkala (Telugu)
• Tobrodah (Tamil)
• Blind Tassel-Fish (English)
• Blue salmon (English)
• Blue threadfin (English)
• Bluenose Salmon (English)
• Blunt-Nosed Salmon (English)
• Colonial Salmon (English)
• Cooktown Salmon (English)
• Giant Threadfin (English)
• Rockhampton Salmon (English)
• Ravas
Economic Importance and Threats
Importance:  Commercial
(Fisheries. Marketed fresh, frozen, and dried or salted.)
Cultured:  Yes

Ecology
Habitat:  Pelagic, Estuarine, Muddy, Coastal
Trophic Level:  Secondary Consumer
Prey:  Prawns, fish (largely members of Mugilidae, Engraulidae, and Sciaenidae), occasional polychaetes, copepods, mysids and other crustaceans
Predator:  Lates calcarifer, Crocodylus porosus

Biogeography


• West Bengal INDIA
• INDIA
• Tamil Nadu, Chennai Coast INDIA
• Tamil Nadu, Gulf of Mannar INDIA
• Kerala, Ponnani Estuary INDIA (Record: 03/1997-02/1999)
• West Bengal, Hugli Matla Estuary INDIA
• Maharashtra, Mumbai Coast INDIA
• Gujarat, Saurashtra Coast INDIA
• Orissa, Puri INDIA (Record: 1987-2006)
• Orissa, Chilika Lake INDIA (Record: 1948-1950)
• Orissa, Dhamra Estuary INDIA
• Gujarat, Off Kandla INDIA (Record: 1986-1987)
• Maharashtra, Mumbai INDIA
• Kerala, Off Calicut INDIA (Record: 1948-1953) (Depth: 3.65-14.63 mts)
• Gujarat INDIA
• Andaman and Nicobar Islands INDIA
• Orissa, Chilka Lake INDIA
• Bay of Benga, INDIA
• West Bengal (Lat: 21.45) (Long: 87.9) INDIA

Literature Source(s)
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  • 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
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Page last updated on:2012-01-23

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