Gangetic whiting
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| Gangetic whiting | ||||||||||||||||||
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 Gangetic whiting
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| Sillaginopsis panijus (Hamilton, 1822) |
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 Range of Gangetic whiting in dark blue
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The Gangetic whiting, Sillaginopsis panijus (also known as the flathead sillago), is a distinctive Asian member of the smelt-whitings family, in its own genus comprising only the single species. This species of minor commercial importance is found along the Southeast coast of the Asian continent where it inhabits protected areas. Its distinctive flattened head allows for easy identification.
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[edit] Taxonomy and naming
The Gangetic whiting is the only species of the genus Sillaginopsis, which itself is in the family Sillaginidae, containing all the smelt whitings. The Sillaginidae are part of the Percoidei, a suborder of the order Perciformes.
The Gangetic whiting was originally named Cheilodipterus panijus in 1822 by Francis Buchanan-Hamilton from a holotype taken from the Ganges estuary in India. The species was further examined by Gill in 1861 in the first review of the family, entitled "Synopsis of the Sillaginoids", which lead to the creation of the genus Sillaginopsis. This new classification changed the binomial name to the currently accepted Sillaginopsis panijus.[1]
[edit] Anatomy
The distinct appearance of the Gangetic whiting makes it the easiest of the smelt whitings to identify. The head of the species is highly depressed, like that of the flatheads, with very small eyes well constricted by the orbits. The first dorsal fin contains ten spines including a large trailing second spine; the second dorsal fin has one spine and 25 to 27 soft rays. The anal fin has two spines and 24 to 27 soft rays. There are 84 to 90 lateral line scales and the species has a total of 42 vertebrae. The species is known to grow to a length of 44 cm.[2]
Another unique feature of this species is its severe reduction or even absence of a swim bladder, which all other members of the family Sillaginidae possess. The Gangetic whiting also has a small mouth with a much shorter lower jaw than upper jaw, with the two anteriormost teeth larger than the rest.[1]
[edit] Distribution and habitat
The Gangetic whiting is found on the southern Asian coast from Pondicherry in the east, northward along the Coromandel Coast and the Ganges delta, Myanmar, Malaysia and occasionally as far south as the Indonesian archipelago.[1]
The species is often found on silty or muddy substrates in shallow, open bays and estuaries along the coast. Juveniles usually migrate into the upper reaches of estuaries for protection against predation by larger species.
[edit] Biology
Gut content analysis has found the Gangetic whiting consumes numerous small fish, benthic and planktonic crustaceans and algae, with its small mouth size restricting the size of food portions.[2]
The Gangetic whiting is the only known species of fish to host the intestinal parasite Dichelyne alatae, found in specimens in West Bengal,[3] with a number of other parasites identified from it.
Otolith and size-age composition studies by Krishnayya (1963) of the commercial catches from the Hooghly River estuary and found that S. panijus probably spawns twice a year during the periods of November to February and August to September. The juveniles migrate toward the upper reaches during March and April and during December where they remain for two to three months. Sexual maturity is attained at a length of about 120 mm.[4]
[edit] Importance to humans
A local fishery exists along the coast of the Bay of Bengal primarily near or on the river deltas, with commercially important fish captured by nets and longlines in the Hooghly and Ganges delta. The Gangetic whiting is sold fresh in local markets, rarely making its way to overseas markets.[1] Juvenile Sillaginopsis panijus are also occasionally traded as brackish water aquarium fish.[5]
[edit] References
- ^ a b c d McKay, R.J. (1992). FAO Species Catalogue: Vol. 14. Sillaginid Fishes Of The World. Rome: Food and Agricultural Organisation, 19-20. ISBN 92-5-103123-1.
- ^ a b "Sillaginopsis panijus". FishBase. Ed. Ranier Froese and Daniel Pauly. Aug 2007 version. N.p.: FishBase, 2007.
- ^ De, N.C.; R.N. Maity (1995). "A new nematode, Dichelyne alatae sp. n. (Cucullanidae), from Sillaginopsis panijus (Pisces) of West Bengal, India". Folia Parasitologica 42 (3): 220–226. PMID 8774775.
- ^ Krishnayya, C.G. (1963). "On the use of otoliths in the determination of age and growth of the Gangetic whiting, Sillago panijus (Ham.Buch.), with notes on its fishery in Hooghly estuary". indian Joural of Fisheries 10: 391–412.
- ^ Schaefer, Frank (2005). Brackish-water fishes : all about species, care and breeding. Rodgau: Aqualog. ISBN 3-936027-82-X.
