Silkworms (Tubifex sp.) play an important role because they can stimulate faster fish growth, especially in seed production. This study aims to analyze and observe the effect of EM-4 administration on tofu dregs on increasing silkworm biomass (Tubifex sp.). The method used in this study is the Completely Randomized Design (CRD) experimental method with 5 treatments and 3 replications. The administration treatments used were P1 EM-4 activator mixture 0 ml/10 g tofu dregs, P2 EM-4 activator mixture 1 ml/10 g tofu dregs, P3 EM-4 activator mixture 2 ml/10 g tofu dregs, P4 EM-4 activator mixture 3 ml/10 g tofu dregs, P5 EM-4 activator mixture 4 ml/10 g tofu dregs. The results of the EM-4 administration treatment on tofu dregs had a significant effect on increasing biomass in treatment 5, producing a value of 10.28 ± 0.80e.
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