Koi carp are one of the most iconic ornamental fish in the world. Originally hailing from Japan, these beautiful fish have amazingly patterned bodies. There are many varieties–– and some of them are ...

Koi carp contribute to poor water quality and are a serious problem in both Australia and New Zealand. Koi carp look very like goldfish, except they grow to larger sizes (in New Zealand up to 10 kg ...

Koi may just look like an oversized goldfish, but they're not even remotely related. Koi are actually a type of carp, and today they're some of the most expensive pet fish in the world.