If you ain't into reading all that terrible local reporting in the link, here's the deal...this lady caught a huge goldfish in a residential pond while trying to catch catfish (hence the basketball sized bobber). Somebody who lives nearby probably let it go, it chowed on radioactive sewage (or Arthur Bryant's) for a few years, and turned into an extremely tame River Monster.
The way it's hanging from the line like a mobile, she probably snagged it rather than hooked it clean, but I ain't here to rain on anyone's parade. Foul hooks happen. Seriously, congrats Olivia, that's a damn big goldfish... Brownliners in Kansas City be warned.