The brighter the fish, the bigger the price tag ... And just like prized dog breeds, Japanese people take koi breeding very seriously. There are regular competitions to name the top koi.

Koi fish are what you might call a happy accident. In the 1600s, Japanese carp farmers began noticing unusual color variations among the fish. "The popular koi fish of today are actually ...

Now, China also has not renewed the last remaining pre-export quarantine deal that expired Oct. 30, Japanese officials said. Not renewing the contract effectively ends China's import of koi fish ...

Koi diplomacy is back with Japanese nishikigoi ... authorities have agreed to resume imports of these vibrantly colored fish, although the reason for the suspension remains unclear.