Sea ducks make a living by preying on little seafood by the sea, so they are also called frolicking ducks. Sea duck eggs are eggs produced by sea ducks cultured in Zhanjiang, Beihai, Qinzhou, Weihai and other coastal areas of China Nanhai Beibu Gulf National Mangrove Reserve.

Every low tide, there will always be a large number of small fish, shrimp, crabs, snails and other marine life stranded in the mangrove forest. These high-protein natural baits have become a delicacy for sea ducks, which makes them fat and have red yolk.

Duck eggs are made from fresh duck eggs. They are nutritious, rich in fat, protein, various amino acids, calcium, phosphorus, iron, various trace elements and vitamins. Easy to be absorbed by human body, with moderate salty taste, suitable for all ages. The eggshell is blue, and its appearance is smooth and flat, which is also called "green egg". Duck egg is a kind of reproduced egg with unique flavor and convenient eating. Duck eggs are delicious food. Folk customs are also called "salted duck eggs", "salted duck eggs" and "green fruits".