Don't leave any standing water around your yard. Anything overturned that collects water (trash-can lid, coffee can, bucket or barrel, etc.) can serve as a breeding pool.
remove all stagnent water
The goldfish will eat the mosquito's larvae before they can leave the pond and fly.
Mosquitoes cannot breed in saltwater. However, adding table salt to vases will likely not hinder or prevent mosquitoes from breeding. You must use the kind of salt found in saltwater environments.
You prevent yellow fever by preventing people from being bitten by an infected mosquito. You can do this to a degree by use of mosquito netting, mosquito repellent, etc. Historically, it was most effectively done by eliminating mosquito breeding ponds, thus reducing or eliminating the population of mosquitoes available to be infected. An effective vaccine against yellow fever is also available.
Pour oil over the water or just remove all water from it. Hope this helps.
Taihland
Mosquitoes present a very pesky problem to people and animals during the summer. One way of combating mosquitoes is by getting rid of any standing water as this is a common mosquito breeding ground.
The removal of standing water is a major contributor to the reduction of mosquito breeding.
Deny them a breeding area (water). Remove any standing water on your property - and don't forget clogged gutters - and it will cut down on the number of mosquitoes greatly.
Stagnant water
Mosquitoes breed in stagnant water .
Fungal issues and mosquito breeding.
All my teachers say that the best way is to add a layer of oil tothe stagnant water surface. This will prevent the mosquito larva from being able to breathe with its breathing tube.