Seems harmless enough. You won your kid a goldfish at the local county fair. Got the fishbowl, a little fish food and even named the little bugger. But after a few weeks the water started to stink, algae was mucking up the sides, and the cat is a day a way from making Goldy his midnight snack. Obviously it makes complete sense to anyone to set Goldy free in a nearby pond or lake. Well, that's been the reality across the country which is why we are not left with invasive goldfish messing up ecosystems in place for years. Football sized goldfish, people. This is what nightmares are made of!