Abundant in cold, deep waters of the Atlantic, Pacific and Indian Oceans, the Giant Isopod is one of the largest crustaceans and the largest known member of the isopod family, a group of crustaceans that are closely related to shrimps and crabs. The largest species can reach up to 1.7 kg (3.7 lb) in weight and up to 76 cm (30 in) in length.