I never see the larvae cause I'm too busy swatting the pesky mosquitoes.
A few years ago I lived in neighborhood in Tampa with a stagnate canal across the street. You couldn't get out the front door with being attacked by a bazillion (slight exageration, but only slight) mosquitoes. I loved the house, but the bugs were tooooooo much. I tried everything on the market to get rid of them, but for every hundred you killed another hundred moved in without missing a beat. I moved out after 8 months.