Journal of the University of Ruhuna is published quarterly as an online journal by University of Ruhuna. Free-downloadable full text articles are available here and on the journal website. Cover Picture: Abundance of biological groups at the selected sites in Nilwala River, Matara, Sri Lanka. The effects of hospital wastes released to Nilwala river is assessed in the in the research article appear in pgs. 33-39. Prof. Kanthi K.A.S. Yapa Editor-in-Chief Department of Physics University of Ruhuna , Wellamadama , Matara.