Below are five graphs with observations of 5 groups of hydrobionts in lake Baikal in 2018, and in 2015, 2016 and 2017 for comparison. The x-axis shows the months of 2015-2018, and the y-axis shows the average value of the population or the total mass index for the time of observation. Each chart has the dash-lines consisting of horizontal lengths of the survey time (1-3 months)

2018 hydrobiological observations in the area of the Baikalsk KOS (wastewater treatment facilities) have shown that the data on the number of bacteria groups detected in surface waters and soils are comparable to the long-term ones. Average heterotroph values, compared with 2017, increased from 1.5 times in February - March (18 cells/ml) to 10.7 times in June (172 cells/ml).

In the area of Northern Baikal, the average of heterotrophic organisms decreased in 2018 as compared with 2017: by 1.6 times in summer, by 1.9 times in autumn. During the season, he average of heterotrophic organisms decreased from July to September by 1.4 times (from 254 to 182 c/ml).

In the area of the Selenga Shallow Waters, the abundance of heterotrophic bacteria in the surface water layer (2018 m) varied from 0.5 to 31 c/ml. As in the previous year, the maximum indicator was registered in the southern part of the shallow waters, opposite the Prorva Strait, while the minimum indicator was registered opposite the mouth of the Galutai canal. The average abundance (54 c/ml) is 3.8 times lower than last year.