EN ▾
ZH
Blackline rasbora
Rasbora borapetensis
Red at the tail, a clear dorsal fin
A black lateral line with gold above crosses the silver body; red is concentrated at the tail base.
- Adult length
- Up to 5 cm (standard length, without the tail fin)
- Water temperature
- 22–26 °C
- pH
- 6–7.5
- Hardness
- 2–12 dGH
- Natural habitat
- Favours shallow margins of slow or standing water, including ponds, ditches, reservoirs and canals.
Keep an open swimming lane alongside planted margins.
Appearance and identification
Similar Rasbora rubrodorsalis has a red dorsal blotch; this species has a largely clear dorsal fin. Tail-base red alone is not diagnostic.
Same-species behaviour
Keep at least 8–10.
Space requirements
Allow a 60 × 38 cm base.
Diet and feeding
Offer small prepared foods alongside small live or frozen foods.
Compatibility limits
A peaceful description does not guarantee compatibility; check predation, feeding competition, space and water separately.
Aquarium environment
Retain horizontal swimming space outside planted cover.
Sources
www.seriouslyfish.com ↗ 2026-10-22