Blue-lined Rasbora (Trigonopoma gracile)

Family: Cyprinidae

Blue-lined Rasbora — a Cyprinidae from Borneo, mostly peaceful community fish. Reaches 4.1–6.1 cm; singly or in small groups depending on temperament. 22–24 °C.

Care parameters

Water temperature
22–24 °C
pH
6.5–7
GH hardness
5–12 dGH
Adult length
4.1–6.1 cm
Minimum tank
45 L
Water layer
Bottom-dwelling
Difficulty
Moderate
Temperament
Mostly peaceful community fish
Origin
Borneo

Species overview

A Cyprinidae species native to Borneo: Trigonopoma gracile lives bottom-dwelling over gravel. Mostly peaceful community fish. Adults reach 4.1–6.1 cm. It is one of the aquarium-kept Trigonopoma species we profile, alongside Trigonopoma pauciperforatum.

Native biotope

Habitat
Clear streams and rivers over gravel
Flow
Moderate, well-oxygenated current
Dissolved O₂
Appreciates well-oxygenated water

Aquascape & hardware

Substrate
Fine gravel and sand
Hardscape
Water-worn stones and driftwood
Plants
Hardy rooted plants along the margins

Temperament, diet & tankmates

Schooling
Singly or in small groups depending on temperament
Diet
Accepts quality flakes, granules and frozen foods
Recommended tankmates
  • Similar-sized peaceful community fish — Compatible size and temperament
Avoid keeping with
  • Fin-nippers — Constant stress

Breeding & notes

Sexual dimorphism
Males often slimmer and more colourful
Breeding method
Egg-scatterer; no parental care

Frequently asked questions

Is Blue-lined Rasbora easy to keep?

A moderate-level species: mostly peaceful community fish; stable water matters more than fancy equipment.

What temperature and water chemistry does Blue-lined Rasbora need?

Set the heater to 22–24 °C and avoid swings. pH 6.5–7, GH 5–12 dGH suit it.

How big does Blue-lined Rasbora get, and what tank size?

Adults reach 4.1–6.1 cm; it is bottom-dwelling. Plan for at least 45 litres.

What does Blue-lined Rasbora eat?

Accepts quality flakes, granules and frozen foods. It forages naturally over fine gravel and sand, so let some food reach the bottom.

Can Blue-lined Rasbora live with other fish?

Yes, with care. Mostly peaceful community fish — pair it with Similar-sized peaceful community fish — Compatible size and temperament and skip Fin-nippers — Constant stress.

Where does Blue-lined Rasbora come from?

Comes from Borneo: clear streams and rivers over gravel. Expect moderate, well-oxygenated current and appreciates well-oxygenated water.

Does Blue-lined Rasbora jump?

Not a noted jumper — a standard cover still keeps dust and spray in.

How does Blue-lined Rasbora breed?

In the aquarium: egg-scatterer; no parental care. Males often slimmer and more colourful.