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Isok barb - Probarbus jullieni

Isok barb - Probarbus jullieni

Scientific name: Probarbus jullieni

Common name: Isok barb

Family: Cyprinidae

Usual size in fish tanks: 95 - 100 cm (37.4 - 39.37 inch)


Recommended pH range for the species: 4.1 - 8.9

Recommended water hardness (dGH): 6 - 19°N (107.14 - 339.29ppm)

0°C 32°F30°C 86°F

Recommended temperature: 22 - 28 °C (71.6 - 82.4°F)

The way how these fish reproduce: Spawning

Where the species comes from: South Asia

Temperament to its own species: peaceful

Temperament toward other fish species: aggressive to smaller

Usual place in the tank: Middle levels

Food and feeding

Isok barb should accept all foods; include some vegetable matter in the diet, along with quality flake or pellets and bi-weekly treats of meaty foods like blood worms, brine shrimp, and chopped prawns.


Asia; Isok barb is found in Malaysia, Thailand, Cambodia, and Vietnam.


There are no visible differences between the sexes.


As of yet, there are no reported cases of these fish breeding in the aquarium.


It is believed that as Probarbus jullieni are slow growers, they can live for up to 25 years.

Short description

The Isok barb is classed as the most endangered fish species on the planet; this is due to over fishing in its natural habitat. Specimens of these fish are rarely seen in the aquarium trade.These fish may grow up to 150 cm in length, so they are suitable for really large tanks only.


Bought by from barb, picture 1 Isok barb, picture 2 Isok barb, picture 3 Isok barb, picture 4 Isok barb, picture 5 Isok barb, picture 6 Isok barb, picture 7 Isok barb, picture 8 Isok barb, picture 9

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