April 24, 2026 – Mariposa County Health & Human Services officials announce annual Mosquito Fish Distribution events in Coulterville and Mariposa.

The Mariposa County Environmental Health Team has scheduled their annual Mosquito Fish Distribution events!

Coulterville Park (MUST CALL TO RESERVE)

Friday, April 24th, from 10:00 a.m. - 12:00 p.m.

10313 Park Lane, Coulterville 95311

Call ahead to reserve your fish - 209-966-2220 or 1-888-777-0377

Mariposa Fairgrounds

Saturday, April 25th, from 8:00 a.m. - Until Gone (First Come, First Served)

In conjunction with the Masters Gardener's Plant Sale

5007 Fairgrounds Road, Mariposa, 95338

This year there is a suggested donation of $5.00, individuals should bring a container for their fish.

Mosquitofish are small fish in the guppy family that are natural predators of mosquito larvae and pupae, making them an environmentally friendly alternative to mosquito control without the use of chemical insecticides. Controlling mosquito larvae is important because it limits the number of adult mosquitoes in the area.

Questions? Call 209-966-2220

Source: Mariposa County Health & Human Services