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logo 11/28/2024 2:25:40 PM     
Hanako ("flower girl") was a remarkable koi fish that lived for 226 years 
JP Source: twitter 12/15/2023
Hanako ("flower girl") was a remarkable koi fish that lived for 226 years
In 1966, Professor Masayoshi Hiro from Nagoya Women’s University's Laboratory of Animal Science dedicated two months to meticulously ascertain Hanako's age. Like the method of counting rings in tree trunks to determine a tree's age, a fish's age is deduced by counting the rings on its scales.
 

These rings, discernible only under a microscope by an expert, reflect the seasonal variations experienced by the fish. A broader ring indicates the summer season, when a fish typically consumes more food and experiences accelerated growth. Conversely, a narrower ring suggests the winter months, marked by a slower metabolism in the fish.

 
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