About Mosquitofish

Gambusia affinis, called “mosquitofish” are very important part of our mosquito control program. They eat mosquito larvae as fast as they hatch from the eggs. Mosquito fish are provided without charge to residents of the District for stocking ornamental ponds, unmaintained swimming pools, and animal water troughs. They generally require no feeding and very little care.

Mosquito fish do not lay eggs, but give birth to live young. They breed throughout the summer and new broods are produced at about six week intervals. The young are about 1/4 inch in length when born and are ready to begin feeding immediately on mosquito larvae. Mosquito fish grow rapidly, and reach a maximum length of about three inches.

The District will keep a summer stock of mosquitofish; and they will generally be available from May to October.

To learn more about mosquitofish you may read our brochure here.