Fishermen choose sturgeons from the nets caught in the Ural River, throw them into boats. Cutting fish at a fish factory; packing black caviar in jars. Photographs depicting the Ural Cossacks, numerous boats on the banks of the Urals, sturgeon caught by the Cossacks. Newsreel: the Ural River polluted by industrial wastewater in the 1950s. Dead fish on the shore and in the water. Wastewater treatment plant on the Ural River, built in the 1970s. Commercial sturgeon fishing in the Ural River in the 1970s. Ichthyologist N. Ye. Peseridi talks about his life, about the problems associated with the breeding of sturgeon fish in the Ural River. The banks of the Ural River, a colony of ducks on the water; geese are flying over the water.