|Scientific Name:||Nemacheilus triangularis|
|Species Authority:||Day, 1865|
Mesonoemacheilus triangularis (Day, 1865)
Mesonoemacheilus triangularis (Day, 1865)
Noemacheilus triangularis tambaraparniensis Menon, 1987
|Taxonomic Notes:||Nemacheilus triangularis was described by Day in 1865. The subspecies designated as N. triangularis tambarapaniensis Menon, 1987 from Tambaraparani River may be a distinct species. Presently it is synonymised under this species (Menon 1987, M. Arunachalam pers. com.).|
|Red List Category & Criteria:||Least Concern ver 3.1|
|Reviewer(s):||Rema Devi, K.R., Gopalakrishnan, A., Arunachalam, M., Shrikant, J., Johnson, J.A., Rahul, K. & Molur, S.|
Nemacheilus triangularis is a widely distributed species occurring in the Western Ghats of three states of southern India. Although the species is harvested for aquarium trade and there is no monitoring, the population trends in this commonly occurring and abundant species is stable, hence Least Concern.
|Range Description:||Nemacheilus triangularis is endemic to the Western Ghats, widespread in southern Karnataka, Kerala and Tamil Nadu (Menon 1987, Devi et al. 1997, Shaji & Easa 2003, Johnson and Arunachalam 2009, Jayaram 2010). It is commonly found in almost all west flowing rivers and in some east flowing rivers in southern India (Tamil Nadu) (Remadevi pers. comm.).|
Native:India (Karnataka, Kerala, Tamil Nadu)
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||It is a fairly common species, abundant in its range (R. Abraham pers. obs.). There is no literature on the population trends of this species.|
|Habitat and Ecology:||Nemacheilus triangularis is a benthic species that are found in both highland and midland areas, preferring oxygenated clear water streams with gravel, cobbles and bedrock with a little amount of sand as the substrate. They are a territorial, omnivorous and forage fishes for larger species (Chhapgar & Manakadan 2000, Biju 2003).|
|Use and Trade:||Nemacheilus triangularis is collected for the aquarium trade. But, levels of off-take from the wild has not been monitored. Not a targeted food fish.|
The species is threatened by widespread deterioration and transformation of its habitat for agricultural expansion and developmental activities including recent spurt in tourism development resulting in the damming of rivers, submerging large areas of habitat as well as pollution from tourism and agricultural sources. In recent years many streams in the species range have been threatened by habitat alterations caused by sand mining, and exploitative fishing by poisoning and explosives, despite not being the targeted species (R. Abraham pers. obs. November 2009).
Some areas of the species' habitat falls in protected areas. Outside PAs, there are no conservation measures of any kind and the threats are escalating. Captive breeding technology has been developed (Mercy et al. 2007).
Biju C. R. 2003. Habitat and Distribution of Hillstream fishes of Northern Kerala. Department of Zoology, Mahatma Gandhi University.
Chhapgar, B.F. and Manakadan, R. 2000. Ecology of Hill Streams of Western Ghats with Special Reference to Fish Community. US Fish and Wildlife Service & Bombay Natural History Society, Bombay.
Devi, R., T.J.Indira, M.B. Raghunathan, M. Marybai and M.S. Ravichandran. 1997. Ichthyofauna of the Tambaraparani River system, Tamil Nadu. Zoos' Print 12(7): 1-2.
IUCN. 2011. IUCN Red List of Threatened Species (ver. 2011.1). Available at: http://www.iucnredlist.org. (Accessed: 16 June 2011).
Jayaram, K.C. 1981. The freshwater fishes of India, Pakistan, Bangladesh, Burma and Sri Lanka - a handbook..
Jayaram, K.C. 2010. The Freshwater Fishes of the Indian Region. Narendra Publishing House, Delhi.
Johnson, J. A. and Arunachalam, M. 2009. Diversity, distribution and assemblage structure of fishes in streams of southern Western Ghats, India. Journal of Threatened Taxa 1(10): 507-513.
Menon A.G.K. 1987. The Fauna of India and Adjacent Countries (Pisces - Teleostei - Cobitidea - Homalopteridae). Zoological Survey of India, Calcutta.
Menon, A. G. K. 1987. The fauna of India and the adjacent countries. Pisces. Vol. IV. Teleostei - Cobitoidea. Part 1. Homalopteridae. Zoological Survey of India.
Mercy, T.V.A and Jacob, E. 2007. A new species of Teleostei: Puntius pookodensis (Cyprinidae) from Wayanad, Kerala, India. Journal of the Bombay Natural History Society 104(1): 76-78.
Shaji, C.P. and Easa, P.S. (eds). 2003. Freshwater fishes of Kerala. pp. 125. Kerala Forest Research Research Institute (KFRI), Thrissur.
|Citation:||Abraham, R. 2013. Nemacheilus triangularis. The IUCN Red List of Threatened Species. Version 2015.2. <www.iucnredlist.org>. Downloaded on 31 August 2015.|
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