Bass is a freshwater fish is also a sea fish. Perch belongs to the cold temperature sea and freshwater migratory fish. Perch can be divided into four categories, Songjiang perch, California perch, river perch belongs to freshwater fish, sea bass belongs to sea fish. Sea bass are mainly distributed in the shallow inshore waters of China and Japan, and will swim upstream to the freshwater areas of rivers and streams during the peak fishing season.

The perch's meat is white and tender, with few fine spines, no fishy odor and delicious taste, and it likes to inhabit in the estuary, but also enters the freshwater areas of rivers.

China's perch varieties are dominated by the Songjiang perch, which preys on shrimp and small fish, and the young fish mainly prey on zooplankton.