We did have a guy from Fish and Wildlife stop by last year and offer us mosquito fish, which I thought was odd since we live right next to a large river delta, and mosquito fish are considered invasive here.
Thankfully no gators in this part of the country
and my frogs seem to be doing well this year. This guy was sitting on the vertical side of an 8-foot tall top-off tank.
I have koi, goldfish, tilapia which eat the mosquitoes and algae in all of my water, but I don't have any open drainage ditches or anything like some of my neighbors, so I don't have to worry about people coming out and doing bizarre things to them. My mother-in-law never knows when they're going to come out and dump herbicide, insecticide, or algaecide into her front yard, or dredge it out completely like they did a few years ago.
Lots of these on patrol, of course, in the air and water, but they're not nearly thorough enough to make a difference, I think.