Mosquito fish (Gambusia affinis) are small, guppy-like fish, which are expansively used in modern mosquito control programs.  They feed primarily on small aquatic insects, such as mosquito larvae. 


Mosquito fish have many benefits in mosquito control:

  • are able to mature, reproduce and survive quite well in a variety of water conditions
  • are able to tolerate moderately high levels of salt, algae, pollutants, and a temperature range from nearly freezing to above 100° Fahrenheit

  • are compatible with most ornamental pond fish, including Goldfish, Koi and Carp
  • are perfect for permanent mosquito breeding sources (basins, ponds, horse troughs, rain barrels, unused pools)


Since they are not native to California, it is prohibited to use them in natural water ways (creeks, streams, lakes).            

Mosquito Fish

Antelope Valley Mosquito and Vector Control District

Protecting Public Health in the Antelope Valley since 1958

The past drought has dried up most of our sources that had been stocked with mosquito fish in the past, so we are currently unable to give out any to residents , while we are trying to increase our own stock.

We will let you know when they are available again.

Sorry for the inconvenience.

Female mosquito-fish produce eggs that hatch within their bodies, releasing 30-100 well developed young, called "fry" into the water.  Young mosquito-fish are about one half inch in length when born and immediately begin eating mosquito larvae.  They grow rapidly in the summer and reach a maximum size of 1-1.5 inches in males and 2.5 - 3 inches in females.  Gambusia breed throughout the summer and a new brood is produced at 4-6 week intervals.  The young fish reach maturity in about 4-5 months.

As part of our Integrated Vector Management program we stocks thousands of these fish each year in artificial ponds, ditches, retention basins, and drainage channels to reduce frequent treatments with mosquito larvicides.