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 ...

If you've ever heard the urban legend about released pet alligators growing to colossal sizes in sewer systems, you might be ...

LAS VEGAS, Nev. (FOX5) - FOX5 has reported on a massive school of hundreds, if not thousands of goldfish at Cadence Pond in ...

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 ...