A new scientific paper with results from REEF's Invasive Species Program research was recently published in the journal Conservation Science and Practice. The findings shed light on the factors affecting invasive lionfish intervention success and efficiency and how to best incorporate these findings into local management for invasive species. As part of a multi-year study with funding from NOAA Coral Reef Conservation Program and others, REEF and partners coordinated regional efforts by divers to cull invasive lionfish on 33 U.S. Atlantic, Gulf of Mexico, and Caribbean protected coral reefs from 2013 to 2019. During each effort, the researchers estimated removal efficiency and efficacy as a function of environmental and habitat conditions, invasion status, and personnel expertise. The authors found that highly experienced individuals culling lionfish during crepuscular periods (2 hr from sunrise/sunset) are three times more efficient (in terms of minutes) than novice divers during midday, suggesting: (a) retention of experienced individuals is key for efficient programs, and (b) planning culls with personnel and time of day in mind increases the number of sites covered with the same effort. Lionfish behavior and habitat characteristics had little effect, but divers had higher capture success at reefs with higher lionfish densities. To see a summary of all scientific papers published using REEF data and programs and to access downloads of the papers, visit www.REEF.org/db/publications.