The data has been collected during the Nansen Legacy Seasonal Study Q4 from 28 November - 17 December 2019 on research vessel RV Kronprins Haakon (cruise number 201971), along a transect in the northern Barents Sea from 76N to 82N. The dataset contains abundance of ice algae marine protists, including ice algae (autotrophic) and protozoa (heterotrophic). Protists were identified and counted with light microscopy using the Utermöhl method and the result are given as cells per liter (cells/L) called organismQuantity.