Freshwater
Blackline rasbora
Rasbora borapetensis
Danionidae, Rasborinae
Facts
Characteristics
- Length
- Up to 10 cm
- Body shape
- Elongated
Care
- Group
- At least 6 together
- Smallest aquarium
- 103 liters
- Diet
- Missing
Know what is missing? Suggest it in the app.
Behavior
Water values
Smallest tank
Range
NativeIntroduced
Lives wild in Brunei, Cambodia, Indonesia, Laos, Malaysia, Thailand, and Vietnam.
Introduced to Philippines and Singapore.
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
Snorkeling a Rice Field: Rare Rasboras & Wild Bettas | Exploring Eastern Thailand EP1
Rodrigo SilvaFeb 13, 2026
Thailand’s River That Looks Like A Real Life Planted Tank! Giant Snakeheads, Barbs, Rasboras & More!
Rodrigo SilvaJun 6, 2025
More about the species
Description
Occurs in swamps, ponds, streams and drains, usually in slow flowing, often somewhat turbid water. Found from midwater level to surface in nearly all ponds, ditches, canals and reservoir margins of 2 m depth or less. Inhabits medium to large rivers, flooded fields and brooks of the middle Mekong. Feeds on zooplankton, insects, worms and crustaceans. Very popular aquarium fish.
Other names
In other languages
- Rødhalerasbora
- Rödstjärtsrasbora
- Rødhalet rasbora
- Punapyrstörasbora
- Borapet rasbora, Red tail rasbora, Red-tailed rasbora, Redtail 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.