The experiments on the effect of the chemical fertilizers added before and after the administration of the organic ones to the rate of reproduction of Daphnia longispina was carried out. In case of using the fish meal as the organic fertilizer, no remarkable effect by the addition, of the chemical one was seen. But, in case of using the rice bran as the organic fertilizer, the effect of the chemical ore added at 3 rd day since the supply of water could be recognized and especially the ammonium sulphate as the chemical one produced the good reproduction of this species (Tables 2 & 3).
Moreover, Daphnia to which the rice bran, as the orga ?? ic fertilizer was given became red and this phenomenon was considered to be caused by their living food.