Koi fish are colorful patterned common carp that are now celebrated in annual koi shows and kept in ponds all over the world. Some are worth millions.

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 ...

Kevin and Tonya Colopy turned their hobby of raising koi into a business called Happy Koi of Greenville. Koi are a species of carp known for their unique colors and patterns, often called "living ...

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 ...