Carcharhinus amblyrhynchos is an endangered reef-associated shark distributed across the tropical Indo-Pacific. Based on 515 shark samples genotyped for 4991 nuclear single-nucleotide polymorphisms, we show that deep oceanic areas act as strong barriers to dispersal, while proximity to habitat facilitates dispersal. We then predict the resulting genetic differentiation across the entire distribution range of the species, providing both local and global-scale conservation units for future management guidance. Not only do we draw meaningful conclusions for the conservation of the grey reef shark, but we also present a modelling framework, suitable for any adult-disperser species. Photo credit by Matthieu Juncker.

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