This research aims to determine the density and protein content of riparian Kelakai plants in the Lubuk Siam Lake, Siak Hulu District, Riau Province. This research was carried out in September-October 2024, located in Lubuk Siam Lake, Siak Hulu District. This research uses a survey method, by calculating density using quadrat plots. Meanwhile, protein levels were calculated using the AOAC metho…