Wednesday, Oct 7, 2026

Fact Brief: Does Santa Clara County give out fish to fight mosquitos?

yes

Santa Clara offers free mosquitofish to all its residents as a way of combating the mosquito population. Santa Clara County vector control gives away mosquitofish to help control the mosquito larvae population in areas of standing water – such as ponds, lakes, watering troughs, unused swimming pools, outdoor spas and rain barrels.

Mosquitofish are natural predators that eat mosquito larvae. They are small fish, no larger than 2.5 inches in length and are an environmentally friendly control option compared to spraying insecticides.

Caring for a population of pest-eating mosquitofish is low maintenance. The fish require sunlight pools that are free of chlorine or ammonia and are compatible pond mates to other ornamental fish breeds like goldfish and koi.

Mosquitofish may need supplemental fish food during the winter when insect populations are low.

This fact brief is responsive to conversations such as this one.

Sources

County of Santa Clara Mosquito and Vector Control District
County of Santa Clara Request free mosquitofish

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Fact briefs are bite-sized, well-sourced explanations that offer clear "yes" or "no" answers to questions, confusions, and unsupported claims circulating online. They rely on publicly available data and documents, often from the original source. Fact briefs are written and published by newsrooms in the Gigafact network.

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Fact Brief: Does Santa Clara County give out fish to fight mosquitos?

Sources

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