The life span of zebrafish is generally about 2-3 years, which is relatively short compared with other fish. But how long they can live depends on the growing environment and the way they are raised. If it is a zebrafish grown in the wild, it will live longer. Because the wild environment is more suitable for them to grow, and zebrafish are less likely to get sick.

If it is a cultured zebrafish, its life span will be shorter. Because artificial breeding can't guarantee the stability of living environment, the life span will be relatively reduced. If breeders want to make zebrafish live longer, they must ensure that they live more comfortably and avoid getting sick.

The body length of zebrafish in adulthood is about 4-6 cm. They belong to small tropical fish. Even if they live in a comfortable environment, their body length in adulthood is about 6 cm at most. If breeders can't guarantee that they grow in a comfortable environment, zebrafish can only grow to 3-4 cm in adulthood. There are some fish with poor physique, which may not reach more than 3 cm. If breeders want zebrafish to grow bigger, they should be fed more high-nutrition food and ensure that their living environment is stable, so that they can grow bigger.