Conventional management of invasive freshwater fish can affect fish welfare and impact non-target species, but targeted, species-specific approaches are urgently needed to enhance efficiency and minimise non-target impacts. Sensory traps—devices that exploit behavioural responses to specific sensory cues—offer a promising tool for invasive fish control. In this study, we explore the potential of light-based cues as attractants or deterrents in the invasive eastern mosquitofish (Gambusia holbrooki). Using a controlled experimental setup, we exposed mosquitofish to a range of coloured LED lights and recorded behavioural responses, including attraction, avoidance, and exploratory behaviour. Preliminary results suggest that mosquitofish exhibit consistent preferences and aversions to specific wavelengths, with implications for the development of light-based sensory traps. These findings offer novel insights into the sensory ecology of a highly invasive species and lay the groundwork for the development of more targeted and ethically sound control strategies in aquatic systems.