The growth potential of koi carp in terms of body size is huge, but exactly how large they can grow often depends on their breeding environment. Under ideal breeding conditions, such as in a spacious pond or a large aquarium, the body length of koi carp can easily reach 90 to 120 centimeters. Even individual varieties can break through the limit of 150 centimeters in an extremely superior environment, and their weight can exceed 45 kilograms.
Such koi carp are like giants in the water. When swimming, they have a majestic posture and are colorful, extremely ornamental. However, if koi carp are bred in a small fish tank with limited space, their body growth will be severely restricted. Due to the narrow range of activity, koi carp cannot fully stretch their bodies, and their body length often can only reach 30 to 40 centimeters, far inferior to their counterparts growing in a natural environment.
Therefore, for aquarium enthusiasts who hope to see the robust body of koi carp, providing sufficient breeding space is crucial.