This dataset contains hydrological and plankton data collected by FRV "Warreen" over the period February 1947-October 1950 in western and south-western Australian waters. Data included comprise depth, temperature, phosphate, nitrate, dissolved oxygen and chlorinity readings, and the results of plankton net tows reported as abundances of diatoms, crustacea (including krill and copepods), chaetognaths, coelenterates, fish eggs and larvae, mollusca and tunicates. These voyages were made while "Warreen" was stationed in Western Australia after returning from war duties and include voyage nos. 29 (July 1947) through 34 (April-June 1949) plus others of which details are not yet collated. Regions visited span the area from North West Cape to Albany and round into the Great Australian Bight. The data were published in a volume of CSIRO's "Oceanographical Station List" series.