|Scientific Name:||Danio rerio (Hamilton, 1822)|
|Taxonomic Notes:||Hamilton (1822) described Cyprinus rerio from Gangetic provinces. Shrestha (1978) treated it under genus Danio.|
|Red List Category & Criteria:||Least Concern ver 3.1|
|Reviewer(s):||Barbhuiya, A.H., Juffe Bignoli, D., Rema Devi, K.R., Dahanukar, N. & Chaudhry, S.|
Danio rerio is very widely distributed species with a few populations threatened from overexploitation for ornamental fisheries. Otherwise, the species is not threatened in its entire range and with the recommendation of continuing monitoring of population trends, it is assessed as Least Concern presently.
|Range Description:||Danio rerio is a widely distributed species, known througout India to Nepal in the north and from Sutlej River in the west and in the east in West Bengal and Arunachal Pradesh.|
Native:Bangladesh; India (Arunachal Pradesh, Assam, Karnataka, Meghalaya, Orissa, Uttar Pradesh, West Bengal); Nepal
|Range Map:||Click here to open the map viewer and explore range.|
It is difficult to assess the population of the species. It is not common in the natural water bodies. It breeds easily in nature. Aquarists have also artificially bred the fish successfuly. In Nepal the catch per unit effort (CPUE) of this species is up to 1.88 %. In Arunachal Pradesh the catch rate is 1.9 % (Tamang et al. 2007).
|Current Population Trend:||Decreasing|
|Habitat and Ecology:|
The species is an annual species. Adults inhabit streams, canals, ditches, ponds and beels occur in slow-moving to stagnant standing water bodies, particularly rice-fields and lower reaches of streams common in rivulets at foot hills. Feed on worms and small crustaceans, also on insect larvae. Breed all year round. Spawning is induced by temperature and commences at the onset of the monsoon season. Food availability also acts as cue for breeding.
|Use and Trade:||Danio rerio is one of the most popular aquarium fishes being extremely active and graceful. Its blue and silver horizontal stripes, its constant activity, the ease with which it is kept and fed, and its inoffensive nature make it a prime favourite with most tropical fish hobbyists. Besides the fact that it is an egg-layer and, therefore, not as easily raised as the livebearers, the Zebra Danio is probably the finest small tropical aquarium fish known. It is strikingly beautiful coloured, easy to feed, and resistant to disease. It attains a length of 4.5 cm. It is hardy and easy to breed; desirable in community tank, and is easily maintained. It is also grown in captivity to use for experimental science.|
Being a popular aquarium fish, it might suffer from over exploitation resulting in fluctuation of individuals.
Although it has been reported from Namdapha National Park, Arunachal Pradesh, it is also distributed in many unprotected areas. Thus, clearly there is a need for improved habitat protection at sites where this species is known to occur. Further survey work is needed to confirm whether or not this species is experiencing a widespread decline, or is undergoing extreme population fluctuations.
Hamilton, F. 1822. An account of the fishes found in the river Ganges and its branches. Edinburgh & London.
IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.4). Available at: http://www.iucnredlist.org. (Accessed: 27 October 2010).
Jha, B.R. 2009. Fish ecological studies in assessing ecological integrity of rivers: Application in rivers of Nepal. VDM Verlag Dr. Muller Aktiengesellschaft & Co. KG, Germany.
Shrestha, J. 1978. Fish fauna of Nepal. Journel of NAtural History Museum Tribhuvan University. 5(1-4): 33-43.
Tamang, L., Chaudhry, S. and Choudhury, D. 2007. Ichthyofaunal contribution to the state and comparison of habitat contiguity on taxonomic diversity in Senkhi Stream, Arunachal Pradesh, India. Journal of the Bombay Natural History Society 104(2): 170–177.
|Citation:||Vishwanath, W. 2010. Danio rerio. The IUCN Red List of Threatened Species 2010: e.T166487A6219667.Downloaded on 17 January 2018.|