How big the goldfish can grow is closely related to the size of the fish tank used in breeding. In the wild growth of goldfish, the activity area is not limited, it can grow up to one meter. But at home, the fish can only be kept in the fish tank. The space of the fish tank is very limited, which limits its swimming range to a great extent. Although goldfish are large tropical fish, the size of fish with low swimming ability is much smaller than that of fish with high swimming ability. Therefore, the goldfish cultured in the fish tank can only grow to 50 to 60 centimeters when they grow up. If the tank in which the fish lives is too narrow, it may not even reach the length of 50 centimeters. If you want the fish to grow to more than 50 centimeters, you should at least choose a fish tank of 1.2 meters to raise it, and ensure that it can get adequate nutrition.
The annual growth rate of the goldfish is not only related to the fish itself, but also closely related to the feeding situation. Generally speaking, under the condition of ensuring adequate nutrition, the body length of goldfish can increase by 10 to 15 centimeters in a year. If it is 12 to 15 centimeters of juvenile fish, after a year, it can grow to 20 to 25 centimeters. However, the growth rate of fish will slow down when they grow to 30 to 35 centimeters. After growing to 35 centimeters, the fish may grow less than 10 centimeters a year, or even less.
