Goldfish Spawning: What to Do When You Find Eggs

Discovering goldfish eggs during a routine water change can be surprising. This aquarist found white eggs with bright centers clinging to tank walls and rocks after cleaning. Most eggs were accidentally discarded, and the remaining ones were quickly eaten by the adult goldfish.

Understanding Goldfish Eggs

• Fertile eggs turn clear with a dark black center (developing eyes) within a day or two.
• Infertile eggs turn white from fungus and should be removed.
• Females can lay eggs without a male present, but they won't be fertile.

Identifying the Sexes

Males develop white breeding tubercles on their gill plates. The female's vent becomes swollen after spawning.

Recommended Actions

1. Remove all eggs (or the adults) to prevent predation—goldfish eat their own eggs and fry.
2. If eggs are fertile and you want to raise fry, set up a separate rearing tank.
3. Read more on goldfish breeding: Goldfish Care and Breeding Guide.

Spawning in a small tank is unusual but possible. Congratulations on your potential new arrivals!