Crustaceans are regularly identified as ecosystem engineers, performing important functions in nutrient pathways and recycling. Within the Murray-Darling Basin (MDB), Murray River crayfish may have been keystone species within nutrient pathways, yet a suite of threatening processes has greatly reduced both the distribution and abundance of this species. We employed unbaited underwater video cameras within a section of the Goodradigbee River (south-eastern NSW) to explore the social and feeding behaviour of Murray River crayfish on patches of detritus in back-eddies of the main channel. Underwater video cameras provided fine-scale resolution of feeding behaviour and revealed complex social interactions among Murray River crayfish using this spatially and temporally restricted food resource. We suggest future lines of enquiry to further understand the role of Murray River crayfish in nutrient cycling in river systems.