Four adult males of L. fluviatilis (LF-01, LF-02, LF-03, and LF-04) were caught in the Chernaya River near the Karshevo village (Pudozhsky District, Karelia, Russia). The Chernaya River belongs to the Onega Lake basin. The studied lamprey is a freshwater potamodromous form of L. fluviatilis from the eastern part of the species’ area.
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