Chinese mitten crab Eriocheir sinensis domesticates a new habitat

The fact of habitation of an invading species - the Chinese mitten crab Eriocheir sinensis - in the Lakhtinskaya Bay of Lake Onega has been registered. It should be mentioned that the first specimens were caught near the Pukhtinskiy Islands of Lake Onega in 1993, and in 2006 - in the Kondopoga Bay and the Povenets Bay of this lake. In 2017, the detection of the Chinese mitten crab was recorded in the Lakhtinskaya Bay of Lake Onega. The morphometric analysis data of these animals have been given. The obtained data can be used to create an information base of the studied species for further analytical examination of its growth and age, life cycle characteristics and reproduction, nutrition and migration movements, as well as for forecasting the ecological situation.