We produce mosquitofish at our Roseville facility as a preventative biological control agent against mosquitoes to reduce larvae from contained water sources like ponds, unmaintained swimming pools and animal water troughs. Many factors affect how well mosquitofish will work to minimize mosquitoes including the water’s condition, time of year, species of mosquito present and mosquitofish predators present. Mosquitofish generally reduce but may not eliminate mosquito larvae completely. Like other mosquito control materials, we do not give away mosquitofish directly to residents. If you are interested in mosquitofish, please submit a problem report to schedule an inspection.
Mosquitofish eat mosquito larvae as they hatch from eggs. Mosquitofish do not lay eggs but, instead, give birth to live young. They breed throughout the summer and new broods are produced at about six-week intervals. The young are about one-fourth inch in length when born and are ready to begin feeding immediately on mosquito larvae. Mosquitofish grow rapidly and reach a maximum length of about three inches. Depending on water quality and predators present, mosquitofish can overwinter and become active again in spring. Repeated applications of mosquitofish each year may not be necessary in many habitats. If you have mosquitofish on your property, no feeding or other care is necessary.
We are able to produce approximately 130 pounds of mosquitofish on an annual basis. Each pound of mosquitofish consists of about 450 individual fish. In the event that our in-house supply does not meet the needs of our residents, we are able to obtain fish from neighboring districts or harvest them from the wild. The District keeps a summer stock of mosquitofish and conducts property inspections of standing water sources from March to October to see if mosquitofish are the right treatment option.
To learn more, read our mosquitofish brochure here.