Once a simple food fish, koi have transformed into living jewels, with some fetching sky-high prices in the global luxury market. Here's how this happened. In the world of high-end pets, few creatures ...

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A dozen koi fish poke their faces up to the pond’s surface, hoping for a bite to eat. They’re smarter and more social than most would give them credit for, and they recognize horticulturists Mark ...

Anything strike you as special about this fish here? Well, it's worth 1.8 million dollars. It won grand champion at the All Japan Koi Show in 2017, and is the most expensive koi fish ever sold. Koi ...