Mosquitofish are tiny freshwater fish that are native to North America. These small fish closely resemble dime store guppies, and like many aquarium fish, mosquitofish bear their young live rather than lay eggs.

In Australia, these tiny insect eating fish are considered to be an invasive species.
Still they are popular among aquarists and are stocked in garden ponds. Their popularity is related to their ability to control mosquitoes, their beauty and hardy nature. They are also important as forage for larger species of freshwater fish such as green sunfish.