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Phytoplankton is a bio-indicator of fertility in waters. This study aims to determine the impact of detergent and pesticide waste on the phytoplankton community structure in in tilapia aquaculture media. The phytoplankton identification stage was carried out at the MIPA Laboratory Almuslim University. The parameters studied were phytoplankton abundance, diversity index, uniformity index, dominance index, and water quality parameters. The results of this study showed that detergent and pesticide waste at the end of the study had caused a decrease in the abundance value of phytoplankton by 3,250 individual/L and 3,750 individual/L. In the control treatment, the highest phytoplankton composition was dominated by Chaetoceros sp., while the pesticide and detergent treatments were dominated by Golenkenia sp. and Microcystis sp. Exposure to detergent and pesticide waste reduced the diversity index value, the phytoplankton uniformity index value. At the beginning of the study, it has a moderate diversity index (H '= 2.485–3.072), while at the end of the study it shows low diversity (H' = 2.111–2.375). Furthermore, at the beginning and at the end of the study there was a decrease in the uniformity index value (E = 0.87–1.01) and (H '= 0.88–0.94).

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I ndonesia has become the largest palm oil producer all over the world. Food and Agriculture Organization (FAO) noted that the total palm oil production of Indonesia in 2014 reached 29.27 million metric tons (FAO, 2016). Together with Malaysia, Indonesia was able to produce more than 85% of the world's palm oil (Jayed et al., 2011; Fitzherbert et al., 2008). One of the negative impacts arising from the existence of palm oil mill industry is the increased pollution from Palm Oil Mill Effluent (POME), which can affect the aquatic environment (Alhaji et al., 2016). POME contains a high concentration of chemical oxygen demand (COD) ranging from 45,000-65,000 mg/L, biochemical oxygen demand (BOD) ranging from 21,500-28,5000 mg/L and high total suspended solids (TSS) ranging from 15,660-23,560 mg/L (Wong et al., 2009; Chan et al., 2013). Bello et al. (2013) reported that oil and grease content in POME being as high as 4,000 mg/L with a pH between 3.4 and 4.7. High concentrations of COD and BOD harm aquatic organisms, for instance, decrease of oxygen consumption and cause of hypoxic condition (Maygaonkar et al., 2012; Verberk et al., 2016; Vithana et al., 2019). Oil and grease are considered as hazardous pollutants, particularly in the