Bass origin in the western Pacific Ocean, China's coastal production, to the Yellow Sea, the Bohai Sea more, the fishing season for the spring and fall seasons, October-November each year for the fishing season, the common bass mainly includes four species, respectively, sea bass, Songjiang bass, seven-starred perch, and the California sea bass.

Cold-temperature sea and freshwater migratory fish, body small, body length of about 100 mm. in freshwater growth and fertilization, inhabiting the bottom of the clear running water, lurking in the daytime, night activities, prey on shrimp and small fish.

One year to reach sexual maturity, in the Songjiang area of Shanghai, the parents of the fish in November each year began to migrate to the estuary, and then moved from the estuary to the shallow sea. At the beginning of the migration, the gonads are not yet mature, and gradually mature as they migrate into the sea. Males migrate earlier and females later.

Expanded information:

No feeding during the breeding period, and after descending to the sea and after the breeding of the parent fish is very The parents are very weak after descending and breeding. After reproduction, the parents move closer to the coast to solicit bait. The spawning grounds are in the intertidal zone. The Tonja Reef in the southern Yellow Sea is a spawning ground for the Songjiang perch, and the spawning period is from mid-February to mid-March.

After 26 days the eggs hatch into young, the female carries 5,100-12,800 eggs, the eggs are sticky, bonded into a block, the egg mass is yellowish, orange or reddish-orange. Juvenile fish begin to move inshore from mid-April and anadromous into freshwater to grow.

Larvae grow rapidly, with an average length increase of 3.2 times in two months. The juvenile fish feeds mainly on zooplankton and is a valuable fish, famous for its tasty meat, most famously produced in Songjiang County, Shanghai.