Rasbora jacobsoni

Family: Cyprinidae

Rasbora jacobsoni — a Cyprinidae freshwater fish. Reaches 3.5–5.2 cm; keep at 22–26 °C.

Care parameters

Water temperature
22–26 °C
pH
6.2–7
GH hardness
5–15 dGH
Adult length
3.5–5.2 cm
Minimum tank
32 L
Water layer
Bottom-dwelling
Difficulty
Moderate
Temperament
Mostly peaceful; some species nip fins

Species overview

Rasbora jacobsoni is a Cyprinidae. In the aquarium it stays mostly peaceful. Plan on 3.5–5.2 cm of adult fish at 22–26 °C. Related profiles: Rasbora borapetensis, Rasbora caudimaculata, Rasbora einthovenii.

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
Shoaling; keep in groups of 6 or more
Diet
Omnivore; prepared foods with regular vegetable matter
Recommended tankmates
  • Similar-sized peaceful community fish — Similar size and water needs
Avoid keeping with
  • Much smaller fish — May outcompete or bully tiny tankmates

Breeding & notes

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

Frequently asked questions

Is Rasbora jacobsoni easy to keep?

Difficulty: moderate. Mostly peaceful; some species nip fins. Shoaling; keep in groups of 6 or more.

What temperature and water chemistry does Rasbora jacobsoni need?

Set the heater to 22–26 °C and avoid swings. pH 6.2–7, GH 5–15 dGH suit it.

How big does Rasbora jacobsoni get, and what tank size?

Full size is 3.5–5.2 cm. Minimum tank: 32 L, with open swimming space along its bottom-dwelling habits.

What does Rasbora jacobsoni eat?

Omnivore; prepared foods with regular vegetable matter. Feed two small meals a day rather than one large one.

Can Rasbora jacobsoni live with other fish?

Mostly peaceful; some species nip fins. Recommended tankmates: Similar-sized peaceful community fish — Similar size and water needs. Avoid Much smaller fish — May outcompete or bully tiny tankmates.

Where does Rasbora jacobsoni come from?

Found in clear streams and rivers over gravel; expect moderate, well-oxygenated current and appreciates well-oxygenated water.

Does Rasbora jacobsoni jump?

Low escape risk, but a lid is cheap insurance.

How does Rasbora jacobsoni breed?

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