Zebrafish can grow to about 6 cm at most, but not all zebrafish can grow to 6 cm. How big they can grow as adults depends on the environment and way of raising them. If zebrafish live in a suitable environment and feed enough food and nutrition, their body length can reach 6 cm in adulthood.

If the breeding environment is uncomfortable or food is scarce, they are generally only about 4 cm long. There are some zebrafish with poor physique, and their body length may be 3-4 cm in adulthood. If breeders want them to grow bigger, they must first ensure that they have enough living space, then ensure that they have enough food, and finally ensure that they live in a comfortable environment.

The life span of zebrafish is generally 2-3 years, and it is not difficult to raise them, but if they are not properly raised, their life span will also be affected. In order to make zebrafish live longer, it is best to ensure that their living environment is comfortable and avoid environmental fluctuations that make them uncomfortable. In addition, breeders need to check and disinfect them regularly to avoid getting sick. Because frequent illness also affects the life span of zebrafish, breeders should try to minimize their illness. Also, the frequency of reproduction will also affect the life span of zebrafish, and if they reproduce more frequently, it will also lead to a shorter life span.