AIMS’ Long-term Monitoring Program (LTMP) represents the longest continuous record of change in reef communities over such a large geographic area. As an integral element of the A Healthy and Resilient Great Barrier Reef” program, the LTMP is responsible for surveying the health of 47 midshore and offshore reefs across the Great Barrier Reef region. The team of trained divers surveys fish by underwater visual census, and records corals and other bottom-dwelling organisms along the same sections of reef each visit. As well as capturing the natural variability of coral and fish populations, the data documents effects of disturbances such as crown-of-thorns starfish outbreaks, cyclones and bleaching events. The data also provides awareness of other threats to the reef (such as outbreaks o