Research on stabilization of palm oil mill effluent sludge (POMS) has been successfully done by using earthworms, Eisenia fetida. Growth and reproduction studies were carried out in the mixture of cow dung (CD) and POMS. The result of the study showed the highest growth was in 60% POMS + 40% CD followed by 40% POMS + 60% CD, 20% POMS + 80% CD, 100% CD, 80% POMS + 20% CD with maximum individual weight raised to 1210.67 ± 10.07 mg/earthworm, 1116.67 ± 5.77 mg/earthworm, 1036.67 ± 64.29 mg/earthworm, 980.00 ± 2.0 mg/earthworm, 699.33 ± 8.08 mg/earthworm respectively. The relative growth rate was determined through the slopeof straight-line regression of the log phase of the growth profile. The highest relative growth rate was in the mixture of 60% POMS + 40% CD and 40% POMS + 60% CD which are significantly different (P..

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