In the study at hand, two rotifer species namely Brachionus calyciflorus (Pallas) and B. angularis (Gosse) were cultured in the laboratory. Effects of algae (mixed culture) and other foods (Chlorella and bread yeast; bread yeast and vitamin B12) were investigated on the population growth of these rotifers. The rotifers under study were collected from Balloki Headworks. They were cultured in the laboratory in two culture stations; each having 10 bottles (1/2 litre capacity). Three samples of 1

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... were taken from each bottle in order to estimate the rotifer density. The best growth was depicted by the rotifers reared on mixed algae, on the other hand, lowest population density as well as daily rate of population multiplication was seen with bread yeast and vitamin B12. Positive correlation was found among the three food types in relation to the population densities (Ind/ml) of both species. A similar trend of correlation was observed among the three food types and the rate of population increase of both species. The results of ANOVA showed that there was a statistically significant difference in the population densities of both species, however, there was a non-significant difference in the rate of increase of population of both species.