This study was evaluated in order to look into the influence factor reached to these water fleas when the international kind and domestic species was aimed at and the long time was exposed to the chromium, the effect that it reaches to the water flea rates of growth, reproduction and transformation was examined and the comparison about each water flea. Experiments were carried out for over 21days for Daphnia magna and Daphnia sp. and over 10days for Moina macrocopa with concentration of chromium of 0, 1, 3, 5, 10 ug/L in culture media. In the experimental result all concentrations, the water flea survived. Therefore, the that the chromium reaches to the alive of the water flea effect determined to write the effect. The time required for first birth of water fleas was longer periods were required with increase of chromium in every species. For testing period, the number of transformation of every species was decreased with the increase of chromium. The size of neonates, born from the survived adult water flea was significantly smaller with increase of toxic concentration. Also, the number of water flea produced per day was decreased in the order of Daphnia magna, Daphnia sp. and Moina macrocopa.