Breed Goldfish Lab Free to play
Goldfish Breeding Simulator: Practice Your First Spawn
Goldfish breeding simulator activities let you practice decisions about eggs and fry in a virtual tank. Observe what changes, choose an action, and learn from the result.
Scenario 01 · About 5 minutes
Your first clutch has arrived.
Six decisions. One growing nursery. Follow the observations from newly laid eggs to early fry care. You can correct each mistake and try the whole scenario again.
This guided simulation illustrates care choices. The tank art is schematic. It does not predict hatch dates, survival, or a safe stocking capacity.
- 1Protect the eggs
- 2Set the flow
- 3Watch the hatch
- 4Offer first food
- 5Manage leftovers
- 6Plan the next stage
Stylized tank view. Follow the observations for the care decision.
A small decision can change the plan
Your job: notice what the fry need next.
A nursery is ready. Food supplies are available. Now decide how to use them as the scene develops.
No account required. Progress saves in this browser when storage is available.
What you observe
Scenario complete
You worked through your first clutch.
You practiced a full set of care decisions. Review your choices below, or replay to try a different approach.
Your result measures choices in this scenario, not readiness to breed real fish.
Your decision replay
Start a fresh attempt? Your current choices will be replaced. You can undo this until you make your next choice.
The decisions you will practice
From protecting eggs to planning space
Protect the eggs
Separate eggs from the adults.
Set the flow
Use gentle aeration and observe the flow.
Watch the hatch
Observe free swimming before first feeding.
Offer first food
Offer tiny food and watch the response.
Manage leftovers
Remove leftovers carefully and check water tests.
Plan the next stage
Plan growing space and care capacity first.
Take the next step with your own tank
Use the companion guide to assess an adult group, and compare tank-bottom options before changing a setup.
The simulation uses the care sources below. Real tanks need observation and suitable care beyond these six decisions.