Abstract
In this paper, we describe the hydrological-hydrochemical and hydrobiological conditions in 3 ponds from Kaliningrad city as registered in the summer of 2021–2022. The list of analyzed indicators included transparency, water temperature, pH value, TDS, water electrical conductivity, dissolved oxygen, permanganate value, nutrients, water hardness. The state of algae and zooplankton within the study period was described and assessed. Based on the survey results, the obtained values were identified pursuant to the scale of hydrochemical transformation. The well-maintained Poplavok pond, where supporting measures are regularly held, as well as the Lesnoye pond, a reservoir in the park area, are in a relatively favorable ecological condition. The ecological situation of the Letniy pond, according to the cumulative assessment, requires rehabilitation of the water body. This is confirmed by both hydrochemical and hydrobiological indicators.
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