Egg is the inactive stage of a mosquito life cycle
Slender, oval, usually dark and visible to the naked eye. Depending on the species, after each blood meal, females produce 50 - 500 eggs in the first brood and usually fewer number of eggs in the succeeding 8 - 10 broods. The protein in animal blood produces the yolk in the fertilized eggs. The egg-laying process can repeat itself every 3 days. Anopheles eggs are laid singly; in the case of Culex mosquitoes they are laid in clusters (rafts) in the mud or on the surface of water or wherever water is likely to accumulate. The mosquito eggs float until they are it is hatched in 2 - 6 days. If optimum conditions persist for only a 2-month period, an initial population of 1,000 female mosquitoes can grow into millions. For every mosquito adult biting people there may be at lease 300 eggs waiting to hatch. Mosquito eggs can lie dormant for up to 7 years!