Abundances of the life stages of zooplankton taxa were calculated in the Arctic Ocean during the Hakon Mosby cruise to Fram Strait in 1987. Samples were collected in obliquely hauled nets with a 1m diameter mesh size: 118 µm). The water volume filtered was measured with a flowmeter attached in the net. Further details on sampling and analysis methodology can be found at Smith et al. (1988). The zooplankton samples were taken as part of the international Marginal Ice Zone Experiment (MIZEX) that was designed to study the atmospheric, oceanic, and ice interactions in the Fram Strait region of the Greenland Sea.