Freshwater
Least rasbora
Boraras urophthalmoides
Danionidae, Rasborinae
Facts
Characteristics
- Length
- Up to 4 cm
- Body shape
- Elongated
Care
- Group
- At least 6 together
- Smallest aquarium
- 24 liters
- Diet
- Missing
Know what is missing? Suggest it in the app.
Behavior
Water values
Smallest tank
Range
Videos
Snorkelling a Suspiciously Clear Irrigation Canal in Thailand | Gourami, Snakeheads, Rasbora & more!
Rodrigo SilvaOct 6, 2026
Snorkelling a Suspiciously Clear Rice Field | Exploring Eastern Thailand EP2
Rodrigo SilvaJul 24, 2026
All the fish species that I found in this rice field in Thailand!
Rodrigo SilvaFeb 17, 2026
All the fish species that I found in this ditch in Thailand!
Rodrigo SilvaFeb 16, 2026
More about the species
Description
Lives in peats and bog wetlands. Occurs in marshes, swamps and ponds with dense growth of fine-leaved aquatic macrophytes. Does not seem to require large open areas. Probably browses on zooplankton in the vegetation. Never seen in markets, but known from the aquarium trade. Uncommonly seen in aquarium trades but widely used as aquarium bait in Ho Chi Minh City, Vietnam.
Other names
Other scientific names
- Rasbora urophthalma
- Rasbora urophthalmoides
In other languages
- Stjärtfläcksrasbora
- Juovaminirasbora, Valkerasbora
- Exclamation-point rasbora, Miniature rasbora
Articles
All articles
How many fish can I keep?4 min read
Why "one cm of fish per liter" falls short, and what adult size, schools, territory and swimming zones mean for how many fish a tank can hold.
Velvet and dropsy4 min read
Velvet is a fast-moving parasite. Dropsy is a sign that something is seriously wrong inside the fish. How to recognize them, and what you can do.
How to set up an Asian aquarium5 min read
Two aquariums from Southeast Asia: calm forest streams and peat swamps with soft, brown water, and fast mountain streams with cool, oxygen-rich water.
How to add new fish4 min read
From the store to the tank: how to get the fish used to your water, why you should add only a few at a time, and what to watch for in the first few days.