Abstract
With a view to study experimentally the influence of duck-raising to the occurrence of mosquito larvae, I raised forty ducks, at the ratio of a duck per 1.9 square meters, in a pond of the suburbs of Makassar, Celebes. I investigated mosquito larvae and environmental factors in the same pond for a month. In the consequence of raising ducks, I ascertained that water became muddy and aquatic algae declined in its luxuriance and then Anopheles larvae decreased remarkably in number. Also Culex larvae showed the tendency to decrease in number.
