Actually Gambusia Holbrooki are Native to the south east and in some fresh and brackish waters are very common. you will find them in most fresh water ditches we use them in local ornamental ponds and foreclosed homes swimming pools in these tuff economic times these are becoming a big problem. Yes some of the big tadpoles eat mosquitoe larvae but the smaller ones are mostly herbivores.
You can also wear long sleeves, light colored clothing and a mosquito net headgear, but stop spraying poison on me and all of the other animals to "protect" yourself.