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.

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.

Christine Whiteley, from Alfreton, Derbyshire, claims she woke up to find detergent had been poured into her garden pond and was not able to save the fish that including Koi carp ...

Cheryl Vetter notes it's possible for koi to live up to 100 years, although 20 to 30 years is more typical. Besides koi, goldfish, another type of carp, thrive in backyard ponds and live peacefully ...

Steven Smith described the scene he found near his pond as a "massacre" A fish enthusiast from East Dunbartonshire has described the death of his prized Japanese koi carp collection as a "massacre".

Officials in Campbell River, B.C., say a recent major operation should serve as a reminder that releasing unwanted pet goldfish into the wild isn’t just illegal, it can be damaging too.

A fish enthusiast from East Dunbartonshire has described the death of his prized Japanese koi carp collection as a "massacre". Steven Smith from Milngavie, who has reared the prized fish for ...

An invasion of goldfish at a quiet pond in the southwestern corner of the Town of Sylvan Lake is causing an uproar. They have been appearing consistently at a neighbourhood storm pond for the last ...