Place the eggs in a separate container. Fill a clean container with filtered or dechlorinated water. The water must be about the same temperature as the water in the main tank. Add the eggs to the container, and gently stir them to prevent them from clumping together. Some egg collectors recommend adding the eggs in a methylene blue solution, which inhibits fungal growth
Provide aeration for the eggs. Oxygen is essential for the embryotic development of goldfish eggs. Use an air pump or airstone to provide aeration for the eggs. The water should be gently bubbling at all times, but not so vigorously that it damages the eggs.
Maintain the water quality. The water in the egg container must be kept clean and free of debris. Perform regular water changes, removing about 10% of the water and replacing it with fresh, conditioned water. Be sure to match the temperature of the replacement water to that of the egg container. Add methylene blue every two to three days.
Allow time to hatch. Goldfish eggs typically hatch within 3-7 days, depending on the water temperature. The higher the water temperature, the faster the eggs will hatch. Keep the water at a consistent temperature during this time to ensure optimal hatching conditions.
Provide food for the fry. Once the goldfish eggs have hatched, they will need to be fed. Feed the fry small amounts of live food, such as brine shrimp or micro worms. Feed the fry several times daily; it is beneficial to keep the water clean.
Monitor the fry and adjust care accordingly. As the fry grows, you may need to adjust the water quality, feeding schedule, and tank size. Ensure regular water changes with fresh, conditioned water to maintain its quality. Watch for any disease symptoms and treat accordingly.
By following these steps, you can successfully hatch and raise goldfish eggs, even without a male goldfish to fertilize them. Happy fishkeeping!