Copepods, the most abundant group of zooplankton, are sensitive indicators of ocean conditions, including sea surface temperature. Given that the EAC transports warm-water communities southward, we hypothesise that a stronger EAC leads to an increased southward transport of subtropical (warmer temperature) copepod communities. In this study, we develop an index to predict the strength of the East Australian Current (EAC). This index is based on changes in the copepod community composition with latitude from the IMOS (Integrated Marine Observing System) Australian Continuous Plankton Recorder program combined with a multivariate statistical model. Our analysis demonstrates that the EAC copepod composition index rises during summer and falls in winter, in agreement with the established seasonal variability in the EAC. These findings suggest that copepod communities could be a novel biological proxy for EAC strength. Future work will assess this index against outputs from oceanographic models and observational data to refine its predictive capability and potentially establish a long-term monitoring of the EAC system based on biological community changes.