The identification of spatially distinct marine populations is essential for understanding population dynamics and persistence, and thus integral in informing management strategies. Traditional physical tagging methods are often used to assess movement and connectivity. However, these approaches are not suitable for crustaceans, which undergo moulting cycles and thus shed external tags. Utilising chemical tags in the calcium carbonate structures of crustacea, just like is used in fish otoliths, presents a possible solution for recreating their population structures. Here, we explore if the chemical signatures in the calcium carbonate exoskeletons of L. gaimardii and P. gigas can be used to correctly assign individuals to known points-of-capture. Additionally, we harness the innate variation in soft tissue turnover rates to establish individual chemical time series of movement for L. gaimardii. This allows us to recreate the spatial history of individuals leading up to an aggregation event. This research not only validates the use of chemical tagging in marine crustaceans, but also provides insights into the interactions of L. gaimardii and P. gigas with their biotic and abiotic environments.