Goldfish possess genetic traits that allow them to swell up to four pounds—the size of a Chihuahua. Experts say that's why you shouldn't release them into the wild.

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 ...

"From cute to brute," it captioned the snap. The official USFWS website explains that although goldfish in pet store tanks may look harmless, "in the wild, they don’t stay small." "Without a ...

The tiny, harmless-looking fish from the pet store won't stay 'cute' without a tank limiting their size. 'Goldfish that once fit in the palm of your hand can balloon into giant, football-sized ...

Meanwhile, Alex and Eddy say the fish are well taken care of. "The fish here last for weeks they keep them in a goldfish tank and are fed every week, every day in a little mini aquarium they have ...