Abstract Green water is one of the growing media which can increase the growth of Daphnia magna. This study aims to determine the effect of green water on the abundance of D. magna. The method used was an experimental method with a completely randomized design (CRD) with 4 treatment levels and 3 repetitions. Treatment P0 = control, P1 = administration of green water at a dose of 7.5 ml/L, P2 =…