Mosquito fish are available for purchase at various online aquarium shops, such as LiveAquaria.com and Livekoiforsale.com, or for free from vector control districts in some states. Mosquito fish require a water source of at least 20 gallons with natural food sources, such as insect larva and algae.
Mosquito fish have voracious appetites and thus control mosquito populations. They also breed quickly and bear live young, which are instantly independent. The downside to keeping mosquito fish is that they may impact other species by eating larvae of beneficial insects and the eggs and fry of other fish. Mosquito fish must remain in closed water systems and should not escape into wild waterways.