Nine cruises took place between 1975 and 1977 on chartered boats and the "Kalinda". Prawn larval biomass and densities were measured in several transects across the Gulf of Carpentaria, as well as total plankton biomass. These data are comprised of three distinct datasets: Total zooplankton biomass - see http://www.marine.csiro.au/marq/edd_search.Browse_Citation?txtSession=6464; Prawn larval densities (All Penaeids identified to genus level) - see http://www.marine.csiro.au/marq/edd_search.Browse_Citation?txtSession=6465; and Prawn larval densities (Metapenaeus and Penaeus only, identified to species) - see http://www.marine.csiro.au/marq/edd_search.Browse_Citation?txtSession=6466.