Portunus pelagicus, commonly known as the blue swimming crab, is a species of crab found in warm coastal waters across the Indo-Pacific region. It is characterized by its blue claws and a flattened body, which allows it to swim efficiently. This crab typically inhabits sandy and muddy substrates, often in estuaries and mangroves. The blue swimming crab is an important species for both commercial and recreational fisheries. It is highly valued for its sweet, tender meat and is often harvested for consumption. Conservation efforts are in place in some regions to ensure sustainable fishing practices and protect its habitats.