About 15 years.

According to the query on Baidu Aigou.com, the seven-star fish is a relatively long-lived ornamental fish. Its lifespan is generally about 5-10 years, and the longest lifespan can reach about 15 years. Of course, the life span of Seven Star Fish will also be affected by many factors, such as breeding conditions, eating habits, water quality, etc.

Seven-star fish, also known as koi, is a common ornamental fish with very bright patterns and colors. It has strong vitality, strong adaptability, gentle living habits, and is easy to breed. It is very popular among aquarium enthusiasts. The food of Seven Star Fish is mainly aquatic plants, plankton, etc. It can also eat some artificial feed.