The growth speed of goldfish is relatively fast compared with other fish. Generally, they can grow about 8 cm in the first year of their birth. If raised properly, they can grow about 10 cm a year, so their growth speed is still relatively fast. If breeders want to make goldfish grow faster, they must first ensure that their living water temperature and water quality are stable, so that their growth state is the best and their growth speed is also the fastest. The second is to ensure that the food they are fed is nutritious enough. Adequate nutrients can make their physique stronger and speed up their growth.

Under normal feeding conditions, goldfish can mature in one year. Although they can mature and reproduce in about one year, their body size will increase with age. Under normal circumstances, their body length will reach about 30 cm.

The specific adult time of goldfish depends on their physique and feeding methods. If breeders can ensure that they live in a comfortable environment, some early-maturing goldfish can mature in 7-8 months. If they are raised in an uncomfortable environment and fed with insufficient nutrition, they will need to reach adulthood for a longer time, about 12-14 months.