How will that affect the Eco-System long term?
Mosquito Predators
https://www.orkin.com/other/mosquitoes/mosquito-predators
Mosquito larvae are very important in aquatic ecology. Many other insects and small fish feed on them and the loss of that food source would cause their numbers to decline as well. Anything that feeds on them, such as game fish, raptorial birds, etc. would in turn suffer too