It is necessary to saturate water body with oxygen and prevent winter fish kill. It was a goal of today's environmental campaign, which took place on the Volga River near Zaymische village of Zelenodolsk region. By joint efforts of the Republic of Tatarstan Ministry of Ecology and Natural Resources inspectors and the Republic of Tatarstan Ministry of Civil Defense and Emergency Situations specialists over 30 holes were drilled in the ice.