Abstract
The results of the introduction of coregonids—the whitefish Coregonus lavaretus and the European cisco C. albula—to Lake Vashozero are considered. It is shown that a positive result was obtained from the introduction of the European cisco; it has naturalized in the lake and successfully reproduces. The biology of the European cisco in a water body new for it was studied, and it was compared to its initial form from Onega Lake. The structure of trophic relations in the water body has changed with the introduction of the European cisco. Previously there was one flow of matter and energy in the lake: benthos—benthophagous fish—carnivorous fish. Now, however, another flow has been added: plankton—European cisco—carnivorous fish.
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