Related: Free Old Hot Tub Gets Stunning Transformation Into Backyard Pond ... fathead minnows, goldfish, and mosquito fish all make for excellent mosquito-repellent pond fish.

At the neighborhood Central Park, a few abandoned goldfish have colonized the manmade pond, establishing a population of hundreds that have grown, in some cases, to the size of a smartphone.

If you have a pet goldfish, but are starting to get overwhelmed with taking care of it, don't just dump it in a local pond.