The number of methanoxidazing bacteria and rate of oxidation of CH4 wa
s studied in water and sediments of the Yenisei estuary, Bay of Yenise
i and Kara Sea. The number of methanotrophs reach 7900 cells per mi. T
he rate of oxidation of CH4 in the water was 0.0004 - 0.2 mkl/day, in
1 kg of sediments - 0.0004 - 3.3 mkl/day. The maximum intensity of thi
s process is found in the river, the minimum - in the sea.