Phytoperiphyton is sessile microscopic organisms that attach on substrates. A research aims to determine the type and abundance of phytoperiphyton on plastic substrate has been conducted on July-August 2019. There were three sampling stations, namely S1 (inlet area), S2 (middle of the lake), and S3 (the ends of lake). In each station, there were 2 sampling sites, in the surface (20 cm depth) an…