The phytogenic food composition in the stomachs of Euphausia superba Dana, caught at 18 sampling stations in the Antarctic part of the Atlantic Ocean, was analysed. The material used was taken from krill catches made from the board of the r/v "Profesor Siedlecki" in the sector "A" of the BIOMASS-FIBEX Programme, in February and March 1981. In the food of Euphausia superba 70 algal taxa were identified, including 68 taxa belonging to Bacillariophyceae and two to Chrvsophyceae. Planctonic diatoms were the main component of the food of Euphausia superba. Single benthic diatoms were found occasionally.