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Vava’u, Kingdom of Tonga, is a well-established whale-watching destination in the South Pacific. Between July and October, the waters around the archipelago represent one of the most important breeding grounds for Oceania humpback whales (Megaptera novaeangliae). The Tongan government allows tourist swimming activities with whales and tour operators strongly promote the practice of swimming-with-whales, focusing primarily on mother-calf pairs. However, there is increasing evidence, derived from empirical research on swim-withcetacean tourism, that this kind of interaction affects cetacean behaviour and can lead to negative effects on the cetaceans involved. This study represents the first assessment of humpback whales’ behavioural responses to vessel and swimmer approaches in Vava’u. Fifty-six surveys took place during the 2016 and 2017 whale breeding seasons aboard dedicated research and tour vessels. Whale dive time, number of reorientation events, and respiration rates were documented in both the absence and presence of boats and swimmers. Vessel approach type, swimmer placement, and whale avoidance responses were also recorded

The Biological Rapid Assessment Programme (BIORAP) is a biological survey based on a concept developed by Conservation International and designed to use scientific information to catalyse conservation action. BIORAP methods are designed to rapidly assess the biodiversity of highly diverse areas and to train local scientists in biodiversity survey techniques.The BIORAP can be considered a spatial and temporal ‘snapshot’ of Vava’u’s full range of biodiversity. The survey did not visit all sites of conservation value in the archipelago and was conducted over a relatively short period of 16 days. Nevertheless, the BIORAP is the most comprehensive biological survey conducted in Vava’u to date, and generated a huge volume of useful information on the biodiversity of the archipelago.