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

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

Without a tank limiting a goldfish's size, they can quickly balloon to a football-sized fish. The fish released in Cadence have repopulated and grown to be unrecognizable from the tiny pets that ...

A massive "megalodon" of a goldfish caught in Presque Isle, Pennsylvania, is a good reminder of why people shouldn't release their pets into the wild, the U.S. Fish and Wildlife Service says.

Now, we’re begging you to stop releasing pet goldfish into local waterways. The seemingly benign and tiny household pets can grow to gargantuan sizes, like the ones the United States Fish ...

Instead, they created an invasive problem that can last decades.” This is because goldfish grow “massive” in the wild, according to the USFWS, where they can turn lakes and waterways into ...

Instead, they created an invasive problem that can last decades.” Officials said “goldfish grow massive in the wild,” and threaten native fish species by stealing food and ruining water quality.