To saturate the pond with oxygen and prevent fish from winter kill. For this purpose, an environmental campaign took place today in the Volga River in Zaimishche village of Zelenodolskiy district. The event was attended by inspectors of the Ministry of Ecology and Natural Resources of the Republic of Tatarstan, the Department of the Ministry for Emergency Situations in the Republic of Tatarstan, the State Committee of the Republic of Tatarstan on biological resources and the indifferent residents.