The lifespan of koi fish usually can reach 70 years.
As a kind of fish with a relatively long lifespan, the lifespan of koi is affected by multiple factors, including the breeding environment and methods. Koi living in the wild can generally live for 60 to 70 years. While in a home breeding environment, the lifespan of koi is generally around 25 years. If the breeding conditions are good, such as clean water quality, water temperature maintained between 20 and 25 degrees Celsius, and scientific feeding, the lifespan of koi may be even longer.
In addition, it is recorded that there is a koi named "Hanako" in Japan that lived for 226 years. This can be regarded as the "oldest and longest-lived" among koi. These pieces of information indicate that although the lifespan of koi is affected by multiple factors, through good breeding management, koi can live a very long time.