Your county health department or mosquito control district might give you some mosquito fish free. They do that here in Maricopa County. I have those plus something sold as an American Flag Fish in my pond to eat mosquitos. They survive our winters.
When the water is warm I also put platies and mollies in for color. They're carnivores and breed in the pond. I overwinter a few dozen in an aquarium.
__________________ May the bridges I've burned light my way.