The one-eyebrow mermaid usually enters maturity after 6 months. In daily feeding, we can judge whether they are adults by looking at their physical changes. Their growth rate is affected by water temperature and water quality. If the water temperature can be well controlled and good water quality can be provided, they can enter adulthood early. Their personality is mild and active, but they have high requirements for the environment. When breeding, it is necessary to provide suitable environment for them to promote their growth.

After adulthood, their scales will be particularly bright, while the color of the scales on the right side will be relatively plain. They will also have a long black line, which will run from their snout to their tail. The black line will be accompanied by scarlet stripes, which will make people feel like a red eyebrow from a distance, but these phenomena will not occur in the seedling stage. This kind of characteristic should be easily identified by people who have raised this kind of fish. In addition, the length of adult fish will be much longer than that of young fish. Generally, the length of adult fish will reach 15 cm, while that of young fish is only a few centimeters.