Mosquito larvae. Mosquito larvae floating just beneath a water surface. Mosquito eggs are always laid in water, though the preferred location depends upon the species. The larvae live at the surface, breathing through a tube at the rear of their body. It also uses this tube to cling to the surface tension of the water so that it does not have to swim. The mouthparts bear a comb of hairs which beat through the water filtering out algal spores, scattered pollen, bacteria and other microorganisms. The larvae are able to swim by snake-like movements. However, large numbers are consumed by fish and other predators during the larvae's 3 weeks of development.