That's almost 40 kilograms of water, 2000 times heavier than your goldfish, and even with a huge tank, you'll still need to replace about 30% of the water every two weeks because besides poop ...

Goldfish and koi are both species of carp that can become invasive, but there are differences between the two species.

Goldie, Bubbles, and all your other adorable pet goldfish can be incredibly harmful to Tennessee ecosystems. If you need to rehome your goldfish, don't ever put the fish in a natural body of water.

Apparently, goldfish owners who tire of having a finny pet occasionally release them into public bodies of water. That's not a good idea. The city of Burnsville, Minnesota, explained Friday why ...

Large goldfish result from people dumping their fish into bodies of water and survive when there are not a lot of native fish to prey on them, said Eric Fischer, aquatic invasive species ...

Goldfish thrived in Cincinnati because our water supply was pumped unfiltered and untreated straight from the Ohio River. Cincinnati goldfish fanciers developed the opinion that goldfish never needed ...

Parks and recreation workers in South Carolina made an extraordinary discovery during a routine water quality test at a small lake. The crew caught a 9-pound goldfish that was about 15 inches long ...