Different appearances and different living environments.

1. Different shapes: There is a rock-like solid object on the oyster shell. The two shells are the same size but different shapes. The left shell is large and concave, while the right shell is small and flat. The surface of the scallop's shell is very smooth. The left and right shells are symmetrical, with the left shell convex and the right shell flat. In addition, scallops are brightly colored, while oyster and abalone shells are mostly off-white.

2. Different living environments: Oysters mainly grow at the intersection of rivers and seas, or on shallow seas in inner bays. The quantity is smaller than other species and the price is higher. Scallops are mainly distributed in northern coastal areas, living below the low tide line with high salt content and attached to reefs and gravel.