Theoretically speaking, the red-headed crane goldfish can reproduce naturally by itself. Every year from April to July is their estrus period and spawning period. If the environment is suitable, they can reproduce many times in the same year. After the crane top red goldfish enters the breeding period, it can be found that the male fish has a very obvious star-chasing, that is, small white spots appear in the pectoral fins. So you can tell the number of males and females in your tank. However, it should be noted that the fertilization rate of this natural reproduction method is not high, and it is easy to bring harm to adult fish.
When it comes to the breeding period, you can properly raise the water temperature to about 25 degrees Celsius. If possible, several adult male and female fish can be selected and isolated for reproduction. After a period of time, it will be found that the male fish is chasing the female fish, and at this time it is throwing the son. After breeding, the female fish should be taken out and isolated, so as to ensure that it is not harmed. However, the fertilization rate of natural reproduction is relatively low, and the damage to adult fish is relatively large. Therefore, in general, artificial breeding is recommended in actual breeding.
