Hanako ("flower girl") was a remarkable koi fish that lived for 226 years

Hanako ("flower girl") was a remarkable koi fish that lived for 226 years

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.

Koi

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