Mosquito fish reduce larval mosquito populations, and some countries have established programs for distributing these small fish to residents. Mosquito fish are often particularly effective in small ponds, water tanks etc. Source reduction: This is possible in some conditions but very difficult in other conditions. Source reduction is particularly useful for vector species, such as Anopheles stephensi, that often breed in man-made containers [i.e. water tanks] and at construction sites. There are several species of malaria vectors, and these species breed in many different locations. If the vector mosquitoes are breeding in water tanks, for example, it is possible to screen the tanks. However, if the malaria mosquitoes are breeding in a swamp, it is not always possible nore wise to attempt to drain the swamp. Thus, other strategies for breaking transmission may need to be used.
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