Zooplankton and water quality of the Ishim River in Northern Kazakhstan

The article presents data on a reconnaissance survey of the ecological condition in the middle reaches of the Ishim River in North Kazakhstan oblast. An assessment based on bioindication methods is given for the ecological condition of the river. The research presents data on the saprobity and quantitative indicators of zooplankton at different river stations. The presence of Ergasilus sieboldi Nordmann has been identified in the Sergeevskoe reservoir.