Hanako (c. 1751 – 7 July 1977) was a scarlet koi fish owned by several individuals, the last of which being Dr. Komei Koshihara. Her name Hanako is translated “flower girl” in Japanese. She was reportedly 226 years old at her death. Her age was determined by removing two of her scales and examining them extensively in 1966. At this time, Hanako weighed 7.5 kilograms and was 70 centimeters long. Once the scales were fully analyzed, it was said that she was 215. She is (to date) the longest-lived koi fish ever recorded.
The average koi breed outside of Japan can be expected to reach 15 years of age, but the average Japanese koi's lifespan is 40 years.
- "Koi Hanako - Longest Living Freshwater Fish Ever". Fish Laboratory. Retrieved 2019-05-27.
- The World's Oldest Koi
- International Nishikigoi Promotion Center-Genealogy
- The Guardian
- Yasuka, Author (2011-10-26). "Hanako, the scarlet koi". KCP International. Retrieved 2018-12-24.
- "The Koi Lifespan and Why Japanese Koi Live Longer". Koi Story. Retrieved 2019-05-27.
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