| Summary: | Lake Onego is one of the biggest European water bodies and a strategic source of drinking water of high quality. In recent decades, trout farming has been intensively developing in the lake. Аt present, 11 trout farms are located in the Kondopoga Bay of Lake Onego. The modern state of the Kondopoga Bay ecosystem in the areas, affected by the trout farms, was assessed through the use of zooplankton indicators based on the observations, carried out in July 2017. The obtained data were compared with the average long-term indicators of the zooplankton community in the central part of the Kondopoga Bay at the beginning of July, 1988–1998. In the areas, affected by trout farms, 31 taxons of zooplankton were found with a rank up to the genus and lower (Calanoida — 3; Cyclopoida — 4; Cladocera — 13; Rotatoria — 11). The species composition of zooplankton is represented by the species, common for the lake of Karelia. In the community species composition, the species, serving as the indicators of eutrophication, are noted. Significant differences were found out between the areas, affected by trout farms, and the central part of the bay. The areas, affected by trout farms, were characterized by low values of the Shannon-Weaver indices, higher proportion of the genus Asplanchna representatives, and higher biomass values of rotifera. Revealed changes indicate an increase in trophicity of these areas. Онежское озеро, один из крупнейших водоемов Европы, содержит стратегический запас воды высокого качества. В последние десятилетия в озере интенсивно развивается форелеводство. В настоящее время в Кондопожском заливе Онежского озера располагаются 11 форелевых ферм. Дана оценка современного состояния экосистемы Кондопожского залива в районе расположения форелевых хозяйств по показателям зоопланктона на основе наблюдений в июле 2017 г. Выполнено сравнение полученных данных со среднемноголетними показателями планктона центральной части Кондопожского залива в начале июля 1988–1998 гг. В районе расположения форелевых хозяйств был ...
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