A research aims to understand types and abundant of periphyton attached in glass substrate (slide glasses) that were placed in the lakustrin zone of the Limbungan Reservoir, Pekanbaru has been conducted from April to May 2011. There were 3 stations, station 1: around the littoral zone and there were aquatic plant, station 2: in the water closed to fish floating cages and station 3: at the centr…