Different stages of biological invasion (adapted from Colautti et al. 2006 and Sinclair et al. 2020), focussed through human-natural systems and positive/negative feedback loops associated with fish farming, translocation and biosecurity. A social-ecological system can be defined as a complex, interconnected network of people and the environment, highlighting the interactions between human society and the ecosystems that support it. In a social-ecological system, both social and ecological factors influence and are influenced by one another, and changes in one element of the system can have cascading effects on other parts of the system (Shackleton et al. 2018). A feedback loop can be defined as a self-regulating system in which the output of the system has an impact on the input of the system, which then modifies the output. Feedback loops can be positive or negative, depending on whether the output of the system reinforces or counteracts the input.