Study site and species. (A) Collection sites from coastal wetlands (Al Lith Bay and Cape Al-Askar Bay), coastal reefs (Coast Guard Reef and Cape Al Askar Reef), shelf reefs (Ron’s Reef, LJ’s Reef, Saut Reef, and Brown Reef), a continental island (Abu Latt), and oceanic reefs (Shi’b Sulaym Reef, Canyon Reef, MarMar Reef, and Dohra Reef) near Al Lith, Saudi Arabia in the Red Sea. (B) Ehrenberg’s snapper (Lutjanus ehrenbergii, Peters 1869) is a commercially important reef-associated snapper species in the Indo-West Pacific. (C) Conceptual diagram of habitat configuration and potential seascape connectivity of L. ehrenbergii in the study area.