The ingestion rates of three Acartia tonsa life-stages (N4-nauplii, C4-copepodites and adult copepods) feeding on three different strains of Alexandrium pseudogonyaulax, isolated from the Danish Limfjord, were determined by means of bottle incubation experiments. In the same experiment the intracellular goniodomin A (GDA) content of A. pseudogonyaulax was determined by LC/MS-MS analysis. This dataset contains the ingestion rates, as well as the carbon and nitrogen content of A. pseudogonyaulax. The preparation and execution of the experiments were carried out between May 1 and July 15, 2022 in the laboratories of the Alfred-Wegener-Institute, Helgoland, Germany.