Puneet Varma (Editor)

Boraras urophthalmoides

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Kingdom  Animalia
Order  Cypriniformes
Genus  Boraras
Higher classification  Boraras
Phylum  Chordata
Family  Cyprinidae
Scientific name  Boraras urophthalmoides
Rank  Species
Boraras urophthalmoides wwwseriouslyfishcomwpcontentuploads201205B
Similar  Boraras, Boraras brigittae, Dwarf rasbora, Boraras merah, Microrasbora

Boraras urophthalmoides in fluval spec 19l aquarium

Boraras urophthalmoides (exclamation point rasbora or least rasbora) is a species of ray-finned fish in the genus Boraras. It was first described from a freshwater swamp associated with the Sai Buri River in Pattani province, southern (peninsular) Thailand, but currently considered to range throughout much of southern and central parts of the country, with the province of Narathiwat on the border, with Peninsular Malaysia appearing to represent the southern limit of its range.


Additional records are not extensive, but it seemingly occurs throughout the Mae Klong and Chao Phraya river basins and has been recorded in both Vietnam and Cambodia, where one notable population inhabits the moats and ponds of the Angkor Wat temple complex near Siem Reap.

Boraras urophthalmoides sparring


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Boraras uriphthalmoides inhabits shallow bodies of water such as swamps, marshes, floodplains and rice paddies, where it is typically associated with submerged vegetation in predominantly clear water. It is also known to move into temporarily inundated areas during the wet season.


This species is very small, ranging from 12 to 16 mm.

Mature females are noticeably rounder-bellied and often a little larger than the slightly more colourful males.

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