Populations of invasive carp (Cyprinus carpio) are established across the southeast temperate region of Australia and their adverse impacts on aquatic ecosystems are well documented. Abundance and biomass estimates based on analyses of extensive survey data suggest there are ≈200 million individual carp (≈215,000 t) in Australia during average hydrological conditions, with perennial rivers of the Murray-Darling Basin (MDB) having the highest biomass densities (up to 3,144 kg ha-1) (Stuart et al. 2021). Carp are considered so dominant that it is widely stated in the scientific literature and media that they contribute up to 90% of fish biomass and that their abundance is continuing to increase. However, such claims are largely based on anecdotal accounts rather than quantitative analyses of the available data. In this presentation, we use 30 years of standardised survey data in the NSW MDB to estimate temporal variation in carp abundance and biomass, and the contribution of carp to total fish biomass, across the time series. We focus particular attention on the outcomes of recent carp recruitment events associated with major floods that occurred in the MDB from 2021 to 2023. Our findings provide important context for the implementation of management and control options for this highly successful aquatic invader.