We examined the effect of different food types, such as algae - Chlorella pyrenoidosa and Scenedesmus acutus, fungus - Saccharomyces cerevisiae and bacterium - Bacillus subtilis, and their concentrations on the body size of females, number and size of laid eggs and the postembryonic period duration of Daphnia hyalina, Daphnia magna and Simocephalus vetulus. The study has revealed that the body length of females and the number of eggs increase, and the post-embryonic period is shortened when the food concentration increases. The more eggs are laid, the smaller size they are. The highest values of the parameters examined were observed in the females which fed on algae, the lowest in those feeding on bacterium Bacillus subtilis.