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Biomanipulation in   Lake Ülemiste, Tallinn

A biomanipulation project was one of the main measures   taken to protect Tallinn’s drinking water reservoir (Lake Ülemiste) and   improve water quality. The aim of the project was to increase the abundance   and size of herbivorous zooplankton in order to control phytoplankton biomass   and therefore improve the water quality in the lake. Improved water quality   helps to reduce the chemical and energy costs of treatment caused by high   phytoplankton biomass in the water (Panksep et al. 2009; Panksep, 2009).