Comparative study on the morphology of Daphnia galeata Sars populations from the lakes of the Todzha depression have carried out. It is revealed, that practically all samples from the different populations were differed among themselves in body length. We did not find any differences in the number of anal teeth and fertility between most of the populations. D. galeata showed high morphological variability in helmet length and some traits of head. We assume that variability of D. galeata is population-level variation and determines by ecological conditions of the lakes.