Koi are actually a type of carp, and today they're some of the most expensive pet fish in the world. But why? Koi were originally raised in Japan in the 1700s when rice farmers first began ...

Almost £1 million worth of rare koi carp collected by the late Freddie Mercury have been accidentally killed by a gardener. The Queen star's 89 fish, each more than 2ft long, were worth about £ ...

Koi diplomacy is back with Japanese nishikigoi, or ornamental carp, set to return to the lucrative Chinese market after a nearly year-long hiatus. Sources have confirmed that Chinese authorities ...