Why do humans eat millions of tons of common carp every year, yet refuse to eat koi, a fish that is biologically almost identical? In this video, we break down the real reasons behind one of the strangest food taboos in the world.

We explore the science of geosmin, the compound that gives carp its muddy taste, and the dozens of tiny pin bones that make the fish hard to eat. We look at the toxic chemical residues like malachite green and heavy metals that build up in ornamental koi over decades. We also trace the history of koi from the snowy rice paddies of Yamakoshi in Niigata, Japan, where a single red mutation turned a survival food into a living work of art.

You will also learn about:

How S Legend sold for 203 million yen at auction
The Taisho Exposition of 1914 and how it changed the way Japan saw carp
The brutal culling process that breeders use to find perfect koi
Why koi colors revert to wild gray within a few generations
How Thorstein Veblen and Mary Douglas explain the taboo
The invasive carp crisis in Australia's Murray-Darling Basin and the Koi Herpesvirus plan
Why the "Copi" rebranding campaign in Illinois failed
How Japanese breeders saved their koi from starvation during World War II

By the end, you will understand why we treat koi as art and not food, and what that says about human psychology.

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