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.

Posted by U.S. Fish and Wildlife Service on Tuesday, February 25, 2025 The official USFWS website explains that although goldfish in pet store tanks may look harmless, "in the wild, they don’t stay ...

Thinking about letting your pet goldfish run wild and free in the Pennsylvania rivers and streams? The U.S. Fish and Wildlife ...

the USFWS also recommends returning it to a pet store or donating it to a local aquarium or rescue group. The agency also noted that while it’s legal to use goldfish as live bait in some states ...