Abstract:
The work studied the general ecological state of Lake Bolshoy Sarykol in the east of
the Abay district of Karaganda region. Morphometric measurements of the reservoir, studies
of samples for hydrochemical composition, composition of bottom sediments, diversity and
quantitative indicators of coastal aquatic vegetation, diversity and quantitative indicators
of phyto- and zooplankton, benthic organisms and fish populations were carried out. The
results of studying the content of sulfates in bottom sediments and mobile sulfur indicate
active sulfate reduction. According to hydrological data, the lake of the steppe zone Bolshoy
Sarykol is experiencing its high-water period. The water in the lake is slightly brackish,
sodium-hydrocorbanate-chloride type, the acidity is neutral, slightly alkaline without harmful
impurities, favorable for fishery reservoirs. The species diversity of Lake Bolshoy Sarykol is
mainly represented by widespread species of planktonic and benthic organisms, nekton and
determines the mesotrophic type of trophism, as well as the β-mesosaprobic type of eutrophication.
The results of the work can be useful for the development of measures and recommendations
aimed at the rational use and protection of water resources in the Karaganda region, since the
studied water body is a typical lake for this region.
