This article describes the results of an exploration of the current state of
some reservoirs of the Ulan district of the East Kazakhstan region: a pond on
the Karasu River 7 km upstream of the village of Privolnoye, a pond on the
Karasu River 2 km upstream of the village of Mitrofanovka, a pond on the
Peschanka River and a pond on the Tugulka River according to hydrochemical and
hydrobiological indicators, in order to determine the status and suitability of
water objects in fish breeding. Research works was carried out in 2021.
Inspections of reservoirs were carried out sporadically, in connection with
this, these water objects can be considered poorly studied. For the analysis of
temporal changes, hydrochemical and hydrobiological samples were taken in
spring, summer and autumn. The content of biogenic compounds and main ions was
studied, the results obtained were compared with the values given in the Unified
Classification System for Water Quality in Water Bodies, and their seasonal
dynamics was also considered. The article defines the class of the reservoir by
chemical composition, the category by mineralization and the class of hardness.
According to the results of research, water objects are characterized by an
optimal oxygen regime, slightly alkaline reaction (pH 7.2–8.7) and low
salinity (310–438 mg/dm³). According to the classification of the main ions,
the waters of the surveyed ponds belong to the hydrocarbonate class, the calcium
group, the first type. It was determined that the concentration of biogenic
compounds in 2021 does not exceed the established fishery standards. The values
of the abundance and biomass of zooplankton and benthos in different seasons of
research are estimated, an assessment of the trophic status of the reservoirs
was given according to hydrobiological indicators and a brief physical and
geographical characteristic of water objects is described. In general, the
trophic class of ponds in the Ulansky district varied from very low class to
high class in terms of hydrobiological indicators, which indicates a good supply
of food resources. It can be noted that the maximum indicators of the
development of the forage base were observed in the summer period. Based on the
results of the analyzes obtained, the status and category of the studied water
bodies were determined.
