Guidance on the monitoring of water quality and assessment of the ecological status of aquatic ecosystems (editors: dr. Lucia Biletchi, corr.mem. Elena Zubcov) was elaborated by the researchers of the Laboratory of Hydrobiology and Ecotoxicology and the Laboratory of Ichthyology and Aquaculture in the frame of the project no. 20.80009.7007.06 AQUABIO, State Program (2020-2023). Some research findings within the ongoing international projects BSB 27 MONITOX and BSB 165 HydroEcoNex (Joint Operational Program Black Sea Basin 2014-2020 of the European Union) were also used. The book represents, in...