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The composition of phytoplankton assemblages in April, 1998 in Galway Bay and during a summer phytoplankton bloom occurring southwest of Ireland in August, 1998, was characterized by pigments measured by high-performance liquid chromatography. Pigment data reflecting phytoplankton assemblages dominated by diatoms in Galway Bay and dinoflagellates in the southwest of Ireland were compared to phytoplankton cell counts. Significant relationships were found between the fucoxanthin concentrations and the diatom cell numbers (P < 0.0002 r2 0.63) during April, and between fucoxanthin (P < 0.0001 r2 0.79), 19′hexanoyloxyfucoxanthin (P < 0.0001 r2 0.77) concentrations and Gyrodinium aureolum cell numbers during the summer bloom. [ABSTRACT FROM PUBLISHER]