Dataset contains monitoring data from field surveys (mainly from crab-traps) on the distribution of European green crab (Carcinus maenas) in mainland Australian coastal waters, from January 1997 onwards. Data are also collected for bycatch of native crab species (including common shore crab Paragrapsus gaimardii, rough rock crab Nectocarcinus integrifrons, and ocean surf crab Ovalipes australiensis). The majority of data comes from one-off trappings in St Vincent Gulf, South Australia, and a suite of sites from SE Victoria (this latter area has been surveyed repeatedly). Some sites were in southern NSW. Data contains details of catch location, date, crab species, crab size, abundance, sex, gonad condition, limb loss, carapace colour. These data were collected as part of CSIRO's studies on the impacts and demographics of introduced marine species in Australian waters and for comparison with green crab distributions in Tasmania.