One unusually cold site was only 12.3 ☌ (54.1 ☏) and another unusually warm site was 38.6 ☌ (101.5 ☏), but the zebrafish still appeared healthy. In surveys of zebrafish locations throughout much of its Bangladeshi and Indian distribution, the water had a near-neutral to somewhat basic pH and mostly ranged from 16.5 to 34 ☌ (61.7–93.2 ☏) in temperature. There is usually some vegetation, either submerged or overhanging from the banks, and the bottom is sandy, muddy or silty, often mixed with pebbles or gravel. Zebrafish typically inhabit moderately flowing to stagnant clear water of quite shallow depth in streams, canals, ditches, oxbow lakes, ponds and rice paddies. Elsewhere the species has been introduced to Colombia and Malaysia. The New Mexico population had been extirpated by 2003 and it is unclear if the others survive, as the last published records were decades ago. Zebrafish have been introduced to California, Connecticut, Florida and New Mexico in the United States, presumably by deliberate release by aquarists or by escape from fish farms. Likewise, old records from Sri Lanka are highly questionable and remain unconfirmed. It has frequently been said to occur in Myanmar (Burma), but this is entirely based on pre-1930 records and likely refers to close relatives only described later, notably Danio kyathit. Its range further south is more local, with scattered records from the Western and Eastern Ghats regions. Its range is concentrated in the Ganges and Brahmaputra River basins, and the species was first described from Kosi River (lower Ganges basin) of India. The northern limit is in the South Himalayas, ranging from the Sutlej river basin in the Bangladesh–India border region to the state of Arunachal Pradesh in northeast Indian. The zebrafish is native to fresh water habitats in South Asia where it is found in India, Pakistan, Bangladesh, Nepal and Bhutan. Zebrafish are also closely related to the genus Devario, as demonstrated by a phylogenetic tree of close species. It has a sister-group relationship with Danio aesculapii. The zebrafish is a derived member of the genus Brachydanio, of the family Cyprinidae.
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