The life span of artificially raised Mary fish is generally about 2-3 years, and their life span is relatively short compared with other fish. If breeders want them to live longer, they must ensure that their living environment is comfortable and their nutrition is adequate. In addition, diseases will also affect their life span. When they are raised in captivity, they need to be sterilized regularly to reduce illness.

The life span of Mary fish grown in the wild is relatively long. In general, their life span will be more than 3 years. There are also some fish with tenacious vitality, and their life span can reach about 6 years. Because the wild environment is more suitable for their growth, and there is plenty of space in the wild, their life span will be longer.

The body length of Mary fish is generally 5-10 cm. They belong to small tropical fish, and their body size is generally not too big in adulthood. However, how big they can grow depends on the environment in which they grow. If they are farmed Mary fish, their body length is generally about 5-8 cm. But wild-grown Mary fish are all 8-10 centimeters long in adulthood. If the breeder wants to make Mary fish grow bigger, he should feed them more high-nutrition food, and ensure that they have enough living space, food and nutrition.