If you have an ornamental pond or pool, mosquitofish may help to control mosquitoes. Mosquitofish, also known as Gambusia, are small predatory fish that eat mosquito larvae.

Multnomah County residents can get free mosquitofish from May 15-August 30.

Call 503-988-3464 or email vector.nuisance@multco.us to schedule a pick up time at our office in North Portland.


By Oregon law, mosquitofish can only be placed in a human-made tank, pool or pond. The water must be a self-contained, with no inlet or outlet to any natural water source. Oregon Department of Fish & Wildlife mosquitofish guidance»