1. Perch is not seafood, but freshwater fish. Mandarin fish is not seafood, but a kind of freshwater fish, which is one of the "four famous freshwater fish" in China. It is also called seasonal flower fish, crucian carp, squid and so on. There are many kinds, mainly mandarin fish, mandarin fish, mandarin fish and mandarin fish.

2. It is one of the common economic fish, and it is also a species for developing marine culture. The main producing areas are Qingdao, Shidao, Qinhuangdao and Zhoushan Islands. The fishing season is spring and autumn, and the annual fishing season is 10 to 1 1.