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We determined the amphipod population characteristics from the water bodies of the delta of the Selenga River, where Gammarus lacustris Sars, 1863 was industrially harvested until the 1990s. In 2011, the population density of G. lacustris varied from 80 to 10200 in Lapkhai Lake and from 80 to 2320 ind./m2 in Krivaya Channel. The low population density (<40 ind./m2) in Gryaznoe Lake, together with...