Look more when you buy it. The back of fresh Pippi shrimp is arched and will not lie flat there. Secondly, the eyes of live shrimp are particularly bright; In addition, the blue shell of Pipi shrimp is generally tender and tender. In addition, remember that females are more delicious than males. Because there is ointment! As for how to tell, there is a king and a mother in Pippi shrimp.