Goldfish possess genetic traits that allow them to swell up to four pounds—the size of a Chihuahua. Experts say that's why ...

But in your home tank, there's no bacteria to be found. You have to introduce it, and that's where a lot of goldfish owners slip up because you can't just buy a fish the same day you get your tank.

Besides causing fiscal and environmental disasters there are other reasons you should keep that goldfish in its tank. More from Science Goldfish may look small and cute in your home, but in the ...

One of the most persistent myths about goldfish is that they only grow to the size of their tank. While there's a grain of truth in this belief, it's rooted in a misunderstanding. The origins of ...

Yamamoto, based in Iwaki, Fukushima Prefecture, unveiled an artwork titled “Message” in December 2000 in which he put goldfish in a tank replicating a phone booth, including features such as ...

Having active goldfish and poor swimmers in the same tank can be problematic. Park officials said they made it possible by adjusting water currents and providing hiding spots for the fish.

While your goldfish may look tiny now, without a tank limiting its size, the Fish and Wildlife Service says it can balloon into a "football-sized" invader. The agency says a single goldfish ...