Cistude
In the spring of 2019, it was decided to fish out the Prussian carp, omnivorous and voracious fish, which became abundant in the lake. In several months, over 20 tons of Prussian carp were fished. After the project was done, results showed the first improvement in the quality of the lake water since 1998. Though still categorized as the lowest, fifth category and not suitable for swimming, the water had less ammoniacal and nitrite compounds, and less algae while zooplankton "Daphnia", which feeds on phytoplankton, reappeared in the lake. Another problem is the poaching. Apart from the direct damage in reducing number of animals (including the protected European pond turtle), it also affects the natural purification of water. The main catch for the poachers is the zander, which, as a predator, is very important in the lake's food chain.