Are you wanting to start raising baby goldfish for your own enjoyment? Maybe you would enjoy sharing goldfish with family, or having some extra fish to start a goldfish pond on your property. Goldfish spawning is a fun time, but will require a little planning and effort on your part.
Goldfish spawning is triggered by temperature. In an outdoor environment, it is brought on by the changes in the seasons. Normally it will occur in the spring as the water temperature begins to stay around 20 degrees Celsius. The range where breeding is possible is from 10 degrees up to 26 degrees. Most breeders will tell you the occurrence of breeding is more likely when the water temperature varies from day to night. If you are using a tank heater, you can simulate this by setting the temperature to 20 degrees during the day, and then either shut it off for the night or lower it around 5 degrees.
When the condition are right you will see the female begin to develop a larger belly filled with eggs. The males will become very frisky, chasing the females around the tank and bumping her in the stomach. This process can last for hours, and sometimes even a couple days. Keep a close eye for when the female begins releasing her eggs.
If you want to have the highest success in raising baby goldfish fry, you need to have a second tank ready before goldfish spawning begins. Ideally you will transfer the fertilized eggs to a hatching thank which contains about 6 to 8 inches of water. Reducing the water depth helps the small goldfish survive, due to less downward water pressure. Their survival rate increases due to not being eaten by the other fish in the aquarium, including other goldfish.
One item you must be very careful about on your hatching tank, make sure the water is an almost exact match in temperature to the breeding tank. Make sure the water has been in the tank for a while, running through a filtration system. You do not want to subject the fry to fresh water, which could be high in chemicals.
The easiest way to transfer the fertilized eggs is by preparing in advance. A breeding mop suspended in the water will become the preferred location for your female to lay her eggs. The sticky eggs will grab onto the mop. Do not remove the mop immediately after seeing her lay one batch and the male fertilizes them with his milt. She normally lays eggs in several passes, up to 5 or 6 times. Make sure to wait until she is finished, and to give time for the milt to fertilize the eggs.
When goldfish spawning is finished is when your real fun begins. You will have the fun of watching the little fry sinking to the bottom of the tank as they hatch, with their yolk sac making them heavy. Within a day they will be swimming around with the yolk sac gone, and hunting for food. Make sure you are prepared with the proper food to give you fry the food to grow. Check at your local pet supply center and have it on hand before the fun begins. You are going to love watching the little fish grow.