One eyebrow mermaid can live for about five years. However, their life span is affected by many factors. Among them, genetic factors have the greatest influence. If they suffer from genetic diseases, their life span can be easily shortened. Some even died at birth. When choosing mating parent fish, we should choose parent fish from three generations to pair, so as to avoid this problem of inbreeding.

The second thing that affects them is the living environment. If the water quality of the mermaid living in the wild is polluted, their life span will naturally be shortened. If it is a family-raised mermaid, their living temperature, feeding and living space are not suitable, then their life span will be shortened. If the living environment is suitable and their resistance is strong, they can even live for seven or eight years.

mermaid with one eyebrow is a common ornamental fish, which often suffers from water mold, rotten tail disease, enteritis and so on. Water mold is caused by poor water quality. When they are found to be sick, they should be fished out first and disinfected with potassium permanganate. Unfinished tail disease is mostly caused by too high feeding density. If the feeding density is too high, they will fight, resulting in body surface injury and illness. When they are found to be sick, they need to apply yellow powder to their wounds. Enteritis is mostly caused by improper feeding by breeders. If they are fed too much, they can't digest, which will easily lead to enteritis. At this time, we should use the corresponding fish medicine to diminish inflammation and treat them.