When zebrafish is old, its body color will become darker, and some will fade. Their bodies will also be deformed, and if they are serious, they will be deformed. The life span of zebrafish is relatively short, only about 2-3 years. If they often get sick during daily feeding, they will get worse when they get old.

Zebrafish belongs to small tropical fish, and its life span is relatively short. Under normal breeding, they can only live for 2-3 years. If they are not raised properly, their life span will also be reduced. Especially, diseases occur in the process of feeding, which will greatly affect their life span. Therefore, in the process of feeding, it is best to keep the surrounding environment stable and treat diseases as soon as possible, so as to prolong the life span relatively. Some well-bred zebras can live for 3-5 years.

Zebrafish is small in size, and its body length after maturity is between 3-4 cm. However, their body size is also closely related to the density of feeding. If the density of feeding is higher, their body size development will be smaller. If they are raised at a lower density, their body size will develop larger, but it will not exceed 6 cm at most.