Abstract
It has been established that the parasitofauna of pike and roach caught from Lake Ladoga and Lake Ilmen differ, which is determined by the significant hydrological and environmental features of these reservoirs. Parasites such as Paracoenogonimus ovatus and Ergasilus sieboldi, which are numerous in the fish of Lake Ilmen and practically absent in Lake Ladoga, can be used as biological tags to determine the reservoir from which this fish was caught. No helminth larvae dangerous to humans and animals were detected in the studied fish.
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