Monitoring data from Lake Vortsjarv dating back to 1964 (varies among parameters). Measured parameters include hydrochemistry, microbiology, phytoplankton, metazooplankton, protozooplankton, macrophytes, macrozoobenthos and background data. The fish data, also available for this lake, are not included in this database. An overview of the present database is given in the paper; Peeter Nõges, Andu Kangur, Ain Järvalt and Tiina Nõges (2001) History of Hydrological and Biological Investigations of Lake Võrtsjärv. Proc. Estonian Acad. Sci. Biol. Ecol. 50 (3): 180-193. More information on this dataset can be found in the Freshwater Metadatabase - BFE_8 (http://www.freshwatermetadata.eu/metadb/bf_mdb_view.php?entryID=BFE_8).