Breeding the java barb
Not known to have been bred in home aquaria; cultured as a food fish, with spawning induced by hormones in aquaculture. An egg-scatterer with no parental care.
Step by step
Not spawned in home aquaria; farms inject breeding pairs with hormones.
Hormone-induced spawning in large farm ponds or tanks; not practical for hobbyists.
Hormone injection (carp pituitary or synthetic) given by trained farm staff.
Large broods: a single female can release thousands of eggs in one spawning.
Fry are raised in nursery ponds on zooplankton and fed powdered feed.
- Expecting it to spawn without hormones
- Housing too small a tank for adults
- Keeping several territorial adults together
Male or female
Mature females are usually deeper-bodied than males, especially when gravid; otherwise there are no obvious external differences.
Can I breed it in my tank?
- Use a separate small tank with a sponge filter and spawning mops, so the eggs aren't eaten.
- Hard: for experienced breeders.
Day-by-day plan
Typical for egg scatterers
- 14 days beforeCondition the parents
Feed live or frozen food twice a day. Keep males and females apart if you can.
- Day 0Spawning
Eggs are scattered over mops or fine plants, often at first light. Remove the parents straight after.
- Day 1Eggs hatch
Most eggs hatch in 1–2 days. Keep the tank dim and remove white (fungused) eggs.
- Day 4Free swimming, first food
Fry use up the yolk and start swimming. Feed infusoria or liquid fry food several times a day.
- Day 8Baby brine shrimp
Switch to newly hatched brine shrimp or microworms. Start small, daily water changes.
- Day 21Crushed flake
Add finely crushed flake. Sort fry by size so the big ones don't eat the small ones.
- Day 60Ready to move
Most small fish reach about 2 cm in 2–3 months and can join the main tank.
A general guide for this breeding type. Days change with temperature and species.
Simulator: guided
Feed live or frozen food twice a day. Keep males and females apart if you can.
Simulator: try it yourself
Set up a virtual breeding tank and see what would likely happen.
- Without live or frozen food the parents aren't in breeding condition.
An educational estimate from the breeding rules, not a promise.