The mermaid with one eyebrow can grow 4-5 cm in a year, and its growth rate will slow down with the increase of growth time. After about 2-3 years, they can fully grow and mature, and finally grow to about 12-15 cm. If you want to find a reference for their growth, the first-year-old mermaid is as wide as an orange. In the second year, the mermaid was as long as a mouse. In the third year, the mermaid has almost completely grown, and they are as big as the palm of a hand at this time.

The mermaid is an omnivorous animal. They can eat meat mainly based on small fish and shrimp, spinach and banana mainly as vegetarian food, and fish feed. Among these foods, meat is the most abundant in nutrients, and it is also meat that is most helpful to their growth and development. However, meat will carry some germs, which need to be sterilized before feeding to avoid infection to their intestines and stomach. Besides, meat is more expensive, and feeding them meat for a long time will lead to malnutrition. In normal feeding, if they want to grow fast, they can be fed mainly by meat and supplemented by vegetarian food.