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The authors first introduce some data on the zooplankton of the northern rivers in
the Zabaikalsky Krai, a site not previously studied and located within the Udokan Range
in the Kalarsky Region. The study describes species composition, abundance and biomass
of zooplankton streams that are the right tributaries of the River Chara: Namingnakan,
Nirungnakan, Ingamakit, Lower Ingamakit, Naminga and their tributaries, as well as for
three stations of the River Chara. The authors describe Camptocercus fennicus, a rare Palaearctic
species found in the River Ingamakit, calculate saprobity index for the Namingnakan,
Nirungnakan, Ingamakit, and Lower Ingamakit rivers. The classes of water quality in the
watercourses are described as clean or very clean, with the exception of the Chara River in
the vicinity of water discharge from sewage treatment plants.
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