Goldfish originated from China during the Tang dynasty when a gold color mutation was observed in silver carp. The gold individuals were then selectively bred for generations. They were first ...

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.

Originally bred from a species of wild carp, goldfish were initially kept for their vibrant color mutations. These fish were considered a symbol of luck and prosperity and were often kept in ...

The goldfish will also reproduce with the native common carp to create bigger hybrid species that are equally harmful. The problem has been very pronounced in the Great Lakes between the United ...