I found it very interesting and eco friendly way of curbing the mosquitoes and hence the mosquitoes borne diseases. 

 Open water sources across Dubai are being populated by Dubai Municipality with a small native fish in a new eco-friendly project to control mosquitos. The municipality has just released the third generation of the aphanius fish bred in captivity by the municipality Pest Control Section especially for the mosquito-control programme. Aphanius fish are placed in open waters to eat mosquito larvae and control population

Aphanius, also known as Arabian Killfish, rarely grow above five centimetres long and were chosen because they eat mosquito larvae growing in ponds, irrigation channels, and outdoor open tanks.

The thrust of the programme is that it is completely natural to the environment and because the fish are already native to the region, there is no risk of introducing an invader species to the watershed. This is a local, native fish and it never becomes big.  

The fish are far better than spraying harmful mosquitoes with pesticides to keep summer populations low. There is no pesticide, using such a fish saves the environment and does not contaminate the water,

Dubai?s target is to cover 1,390 irrigation tanks in the farms.