|Goldfish are small adorable little fish that can be purchased for a nominal price at any local pet shop. Most people don't think of them as an invasive species. People who get tired of them, and cannot find the heart to flush them down the toilet, are granting them their freedom instead. That is turning out to be a mistake.|
Set free in Canada's waterways, they can never get enough food to satiate themselves. This causes them to keep growing. They are also tough, fully capable of living in cold waters with little oxygenation.