goldfish grow 8-10 cm in a year, and their growth speed is still relatively fast. But how big you can grow in a year depends on the growing environment and the food you feed. Under normal feeding, goldfish can grow by about 8 cm a year. If breeders can ensure that their living environment is comfortable and their nutrition and food are sufficient, they can grow about 10 cm a year, and some goldfish with fast growth and development can grow more than 10 cm a year.

goldfish live for 6-10 years, but how long can they live depends on the breeding environment and their species. If breeders can ensure that they live in a stable environment and goldfish are less likely to get sick, they will live longer. Under normal circumstances, it can reach 6-7 years. If they live in an uncomfortable environment and have poor physique, their life span is generally about 5-6 years. There are also some complex goldfish whose life span will be shorter. Even if they are properly raised, their life span will not be too long, about 5 years.

If breeders want to make goldfish live longer, they must ensure that their living environment is comfortable and try their best to avoid goldfish getting sick. In this way, their physique can be better and their life span will be longer.