Andaman sea, Satun, Thailand. A swimming crab (Portunus sp.) with a missing claw hides in the crevices of Hin Chao Kam, a pinnacle near Koh Bulon Lae, in Satun province, Thailand. Swimming crabs are one of the most important species to the fisheries in this region, and remain a source of livelihood for the artisanal fishers.