Distribution and numbers of Lobodon carcinophagus and Leptonychotes weddelli were evaluated. Lobodon carcinophagus dominated on ice floes in offshore zone of Mirnyj Station and in regions of open pack ice close to the northern edge of ice fields. Leptonychotes weddelli dominated only on the shore-ice close to Leningradskaja Station in March 1979. A thesis of the lowered daily activity of Leptonychotes weddelli was confirmed by observations.