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Exclamation-point rasbora
Boraras urophthalmoides
A separate dot beyond the flank stripe
A long dark flank stripe and a separate round tail-base spot mark a pale golden body.
- Adult length
- Up to 1.6 cm (standard length, without the tail fin)
- Water temperature
- 20–28 °C
- pH
- 6–7
- Hardness
- 1–10 dGH
- Native range
- Central and southern Thailand, including the Sai Buri, Mae Klong and Chao Phraya basins, with additional records in Vietnam and Cambodia.
- Natural habitat
- Occupies shallow swamps, floodplains and rice fields, often among submerged plants, and enters temporarily flooded areas during the wet season.
Its tiny size calls for mature stable water, gentle flow and shelter; check filter intakes and food size.
Appearance and identification
Often confused in trade with chili rasboras. A paler body and distinct tail-base spot are useful clues, but reddish individuals occur.
Same-species behaviour
Keep at least 8–10. Hybridisation with other Boraras is possible.
Space requirements
A 45 × 30 cm base.
Diet and feeding
Offer tiny prepared foods and small live or frozen foods; check that sheltered fish feed.
Compatibility limits
Consider predation and feeding competition when choosing companions.
Aquarium environment
Dense plants and floating shade provide cover.
Similar and related fish
