Is there a way to get rid of mosquito larvae in running water?

Our fountain is a barn stone with a hole drilled through the middle. So the water goes up the middle then runs down the rock into an underground reservoir. We have larvae that has attached itself all over the stone. I know it is mosquito larvae because we took a couple off to see what they turned into. Is there anyway to kill these things. My dogs drink off of it and the birds land on it to drink and take baths. I saw they have mosquito dunks but with the water always running I don’t think they would work. Any ideas?
There is no pond. No place to put fish. No standing water. The water just runs down the stone. Kinda like a pondless waterfall. I’m not sure the dunks will work because I think you need still water for those. The larvae feeds on the dunks and that is what kills them I believe.

Salt the water. It’s then not toxic for the dog and birds, they simply won’t drink it but mosqitoes won’t be able to live in salt water.

Concrete Garden Statues Part 2

Kichler Lighting 15406WST 12-Volt Low Voltage Illuminated Bird Bath with Satin-Etched Glass Bowl, Textured Weatherstone $420.00 Create a focal point in your garden day or night with this aluminum and glass illuminated bird bath. The satin etched glass basin glows with color and texture from the center mounted uplight. Weathered stone finish base with glass bowl. Includes a transformer with timer and photocell, noncorrosive stake, 25 feet of cable and cable connectors. By Kichler….

Making Concrete Garden Ornaments $17.95 A celebrated teacher has gathered the tried-and-true techniques used by sculptors and folk artists, and tailored them for low-tech surroundings. Work with molds; form over armatures; model or carve with concrete; and treat concrete surfaces with mosaics, embedded objects, incising, and coloring. For dazzling outdoor embellishments, craft a Birdbath, Little Lady Fountain, and more. Twenty-five proj…