Dušan Nikolić, PhD, received the second prize “Assistant Professor Milena Dalmacija, PhD” for his doctoral dissertation, which gave the best scientific contribution in the field of environmental protection at universities in the Republic of Serbia for 2020. The doctoral dissertation entitled “Ecotoxicology and histopathology of perch (Perca fluviatilis) from artificial lakes in Serbia” was done at the Faculty of Biology, University of Belgrade, under the mentorship of Jasmina Krpo-Ćetković,PhD, Associate Professor of the Faculty of Biology and Stefan Skorić, PhD, Research Associate Professor, Institute for Multidisciplinary Research.